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Merge pull request #135 from LNIS-Projects/dev 

Support on Native Fracturable LUT Design
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Laboratory for Nano Integrated Systems (LNIS) 2020-11-26 13:55:37 -07:00 committed by GitHub
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3
.github/workflows/fpga_verilog_reg_test.sh vendored
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@ -13,6 +13,9 @@ python3 openfpga_flow/scripts/run_fpga_task.py fpga_verilog/lut_design/single_mo
echo -e "Testing Verilog generation for LUTs: simple fracturable LUT4 ";
python3 openfpga_flow/scripts/run_fpga_task.py fpga_verilog/lut_design/frac_lut4 --debug --show_thread_logs
echo -e "Testing Verilog generation for LUTs: native fracturable LUT4 ";
python3 openfpga_flow/scripts/run_fpga_task.py fpga_verilog/lut_design/frac_native_lut4 --debug --show_thread_logs
echo -e "Testing Verilog generation for LUTs: simple fracturable LUT4 using AND gate to switch modes";
python3 openfpga_flow/scripts/run_fpga_task.py fpga_verilog/lut_design/frac_lut4_and_switch --debug --show_thread_logs

139
docs/source/manual/arch_lang/circuit_model_examples.rst
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@ -724,7 +724,15 @@ Template
- ``circuit_model_name="<string>"`` Specify the ``circuit_model`` that will be used to build these buffers
- ``location_map="[1|-]"`` Customize the location of buffers in intermediate stages. Users can define an integer array consisting of '1' and '-'. For example, ``-1-1-`` indicates buffer inseration to every two stages of the LUT multiplexer tree, considering a 6-input LUT.
- ``location_map="[1|-]"`` Customize the location of buffers in intermediate stages. Users can define an integer array consisting of '1' and '-'. Take the example in :numref:`fig_lut_intermediate_buffer_example`, ``-1-`` indicates buffer inseration to the second stage of the LUT multiplexer tree, considering a 3-input LUT.
.. _fig_lut_intermediate_buffer_example:
.. figure:: ./figures/lut_intermediate_buffer_example.svg
:scale: 80%
:alt: detailed lut composition
An example of adding intermediate buffers to a 3-input Look-Up Table (LUT).
.. note:: For a LUT, three types of ports (``input``, ``output`` and ``sram``) should be defined. If the user provides an customized Verilog/SPICE netlist, the bandwidth of ports should be defined to the same as the Verilog/SPICE netlist. To support customizable LUTs, each type of port contain special keywords.
@ -757,40 +765,89 @@ Template
Single-Output LUT
`````````````````
:numref:`fig_lut` illustrates an example of LUT modeling, which consists of input/output buffers and a transmission-gate-based tree structure.
:numref:`fig_single_lut3_example` illustrates an example of LUT modeling, which consists of input/output buffers and a transmission-gate-based tree structure.
.. _fig_lut:
.. _fig_single_lut3_example:
.. figure:: ./figures/lut.png
.. figure:: ./figures/single_lut3_example.svg
:scale: 80%
:alt: Detailed LUT composition
:alt: detailed lut composition
An example of a LUT with transistor-level design parameters.
An example of a single-output 3-input LUT.
The code describing this LUT is:
.. code-block:: xml
<circuit_model type="lut" name="lut6" prefix="lut6">
<circuit_model type="lut" name="lut3" prefix="lut3">
<input_buffer exist="on" circuit_model="inv1x"/>
<output_buffer exist="on" circuit_model_name="inv1x"/>
<lut_input_buffer exist="on" circuit_model_name="buf2"/>
<lut_input_inverter exist="on" circuit_model_name="inv1x"/>
<pass_gate_logic circuit_model_name="tgate"/>
<port type="input" prefix="in" size="6"/>
<port type="input" prefix="in" size="3"/>
<port type="output" prefix="out" size="1"/>
<port type="sram" prefix="sram" size="64"/>
<port type="sram" prefix="sram" size="8"/>
</circuit_model>
This example shows:
- A 6-input LUT which is configurable by 64 SRAM cells.
- The multiplexer inside LUT will be built with transmission gate using circuuit model ``inv1x``
- A 3-input LUT which is configurable by 8 SRAM cells.
- The multiplexer inside LUT will be built with transmission gate using circuit model ``inv1x``
- There are no internal buffered inserted to any intermediate stage of a LUT
.. _circuit_model_frac_lut_example:
Fracturable LUT
```````````````
Standard Fracturable LUT
`````````````````````````
:numref:`fig_frac_lut3_example` illustrates a typical example of 3-input fracturable LUT modeling, which consists of input/output buffers and a transmission-gate-based tree structure.
.. _fig_frac_lut3_example:
.. figure:: ./figures/frac_lut3_example.svg
:scale: 80%
:alt: detailed lut composition
An example of a fracturable 3-input LUT.
The code describing this LUT is:
.. code-block:: xml
<circuit_model type="lut" name="frac_lut3" prefix="frac_lut3" dump_structural_verilog="true">
<design_technology type="cmos" fracturable_lut="true"/>
<input_buffer exist="true" circuit_model_name="inv1x"/>
<output_buffer exist="true" circuit_model_name="inv1x"/>
<lut_input_inverter exist="true" circuit_model_name="inv1x"/>
<lut_input_buffer exist="true" circuit_model_name="buf4"/>
<pass_gate_logic circuit_model_name="tgate"/>
<port type="input" prefix="in" size="3" tri_state_map="--1" circuit_model_name="OR2"/>
<port type="output" prefix="lut2_out" size="1" lut_frac_level="3" lut_output_mask="0"/>
<port type="output" prefix="lut3_out" size="1" lut_output_mask="0"/>
<port type="sram" prefix="sram" size="8"/>
<port type="sram" prefix="mode" size="1" mode_select="true" circuit_model_name="ccff" default_val="1"/>
</circuit_model>
This example shows:
- Fracturable 3-input LUT which is configurable by 9 SRAM cells.
- There is a SRAM cell to switch the operating mode of this LUT, configured by a configuration-chain flip-flop ``ccff``
- The last input ``in[2]`` of LUT will be tri-stated in dual-LUT2 mode.
- An 2-input OR gate will be wired to the last input ``in[2]`` to tri-state the input. The mode-select SRAM will be wired to an input of the OR gate.
It means that when the mode-selection bit is '1', the LUT will operate in dual-LUT5 mode.
- There will be two outputs wired to the 5th stage of routing multiplexer (the outputs of dual 5-input LUTs)
- By default, the mode-selection configuration bit will be '1', indicating that by default the LUT will operate in dual-LUT2 mode.
:numref:`fig_std_frac_lut` illustrates the detailed schematic of a standard fracturable 6-input LUT, where the 5th and 6th inputs can be pull up/down to a fixed logic value to enable LUT4 and LUT5 outputs.
.. _fig_std_frac_lut:
.. figure:: ./figures/std_frac_lut.svg
:scale: 80%
:alt: detailed lut composition
Detailed schematic of a standard fracturable 6-input LUT.
The code describing this LUT is:
.. code-block:: xml
@ -800,24 +857,60 @@ Fracturable LUT
<output_buffer exist="true" circuit_model_name="inv1x"/>
<lut_input_inverter exist="true" circuit_model_name="inv1x"/>
<lut_input_buffer exist="true" circuit_model_name="buf4"/>
<lut_intermediate_buffer exist="true" circuit_model_name="buf4" location_map="-1-1-"/>
<pass_gate_logic circuit_model_name="tgate"/>
<port type="input" prefix="in" size="6" tri_state_map="-----1" circuit_model_name="OR2"/>
<port type="input" prefix="in" size="6" tri_state_map="----11" circuit_model_name="OR2"/>
<port type="output" prefix="lut4_out" size="2" lut_frac_level="4" lut_output_mask="0,2"/>
<port type="output" prefix="lut5_out" size="2" lut_frac_level="5" lut_output_mask="0,1"/>
<port type="output" prefix="lut6_out" size="1" lut_output_mask="0"/>
<port type="sram" prefix="sram" size="64"/>
<port type="sram" prefix="mode" size="1" mode_select="true" circuit_model_name="ccff" default_val="1"/>
<port type="sram" prefix="mode" size="2" mode_select="true" circuit_model_name="ccff" default_val="1"/>
</circuit_model>
This example shows:
- Fracturable 6-input LUT which is configurable by 65 SRAM cells.
- Intermedate buffers are added to every two stages of the internal multiplexer
- There is a SRAM cell to switch the operating mode of this LUT, configured by a configuration-chain flip-flop ``ccff``
- The last input ``in[5]`` of LUT will be tri-stated in dual-LUT5 mode.
- An 2-input OR gate will be wired to the last input ``in[5]`` to tri-state the input. The mode-select SRAM will be wired to an input of the OR gate.
It means that when the mode-selection bit is '1', the LUT will operate in dual-LUT5 mode.
- Fracturable 6-input LUT which is configurable by 66 SRAM cells.
- There are two SRAM cells to switch the operating mode of this LUT, configured by two configuration-chain flip-flops ``ccff``
- The inputs ``in[4]`` and ``in[5]`` of LUT will be tri-stated in dual-LUT4 and dual-LUT5 modes respectively.
- An 2-input OR gate will be wired to the inputs ``in[4]`` and ``in[5]`` to tri-state them. The mode-select SRAM will be wired to an input of the OR gate.
- There will be two outputs wired to the 4th stage of routing multiplexer (the outputs of dual 4-input LUTs)
- There will be two outputs wired to the 5th stage of routing multiplexer (the outputs of dual 5-input LUTs)
- By default, the mode-selection configuration bit will be '1', indicating that by default the LUT will operate in dual-LUT5 mode.
- By default, the mode-selection configuration bit will be '11', indicating that by default the LUT will operate in dual-LUT4 mode.
Native Fracturable LUT
``````````````````````
:numref:`fig_native_frac_lut` illustrates the detailed schematic of a native fracturable 6-input LUT, where LUT4, LUT5 and LUT6 outputs are always active and there are no tri-state buffers.
.. _fig_native_frac_lut:
.. figure:: ./figures/native_frac_lut.svg
:scale: 80%
:alt: detailed lut composition
Detailed schematic of a native fracturable 6-input LUT.
The code describing this LUT is:
.. code-block:: xml
<circuit_model type="lut" name="frac_lut6" prefix="frac_lut6" dump_structural_verilog="true">
<design_technology type="cmos" fracturable_lut="true"/>
<input_buffer exist="true" circuit_model_name="inv1x"/>
<output_buffer exist="true" circuit_model_name="inv1x"/>
<lut_input_inverter exist="true" circuit_model_name="inv1x"/>
<lut_input_buffer exist="true" circuit_model_name="buf4"/>
<pass_gate_logic circuit_model_name="tgate"/>
<port type="input" prefix="in" size="6"/>
<port type="output" prefix="lut4_out" size="2" lut_frac_level="4" lut_output_mask="0,2"/>
<port type="output" prefix="lut5_out" size="2" lut_frac_level="5" lut_output_mask="0,1"/>
<port type="output" prefix="lut6_out" size="1" lut_output_mask="0"/>
<port type="sram" prefix="sram" size="64"/>
</circuit_model>
This example shows:
- Fracturable 6-input LUT which is configurable by 64 SRAM cells.
- There will be two outputs wired to the 4th stage of routing multiplexer (the outputs of dual 4-input LUTs)
- There will be two outputs wired to the 5th stage of routing multiplexer (the outputs of dual 5-input LUTs)
Flip-Flops
~~~~~~~~~~

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docs/source/manual/arch_lang/figures/frac_lut3_example.svg Normal file
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6
openfpga/src/fabric/build_lut_modules.cpp
View File

@ -73,7 +73,8 @@ void build_lut_module(ModuleManager& module_manager,
VTR_ASSERT (1 == lut_input_ports.size());
VTR_ASSERT (1 <= lut_output_ports.size());
VTR_ASSERT (1 == lut_regular_sram_ports.size());
VTR_ASSERT (1 == lut_mode_select_sram_ports.size());
VTR_ASSERT ( (0 == lut_mode_select_sram_ports.size())
|| (1 == lut_mode_select_sram_ports.size()));
}
/***********************************************
@ -268,7 +269,8 @@ void build_lut_module(ModuleManager& module_manager,
}
/* Sanitity check */
if ( true == circuit_lib.is_lut_fracturable(lut_model) ) {
if ( (true == circuit_lib.is_lut_fracturable(lut_model))
&& (false == lut_mode_select_sram_ports.empty()) ) {
if (mode_select_port_lsb != circuit_lib.port_size(lut_mode_select_sram_ports[0])) {
VTR_LOGF_ERROR(__FILE__, __LINE__,
"Circuit model '%s' has a unmatched tri-state map '%s' implied by mode_port size='%d'!\n",

5
openfpga_flow/openfpga_arch/README.md
View File

@ -2,8 +2,9 @@
Please reveal the following architecture features in the names to help quickly spot architecture files.
Note that an OpenFPGA architecture can be applied to multiple VPR architecture files.
- k<lut\_size>: Look-Up Table (LUT) size of FPGA. If you have fracturable LUTs or multiple LUT circuits, this should be largest input size.
- frac: If fracturable LUT is used or not.
- k<lut\_size>\_<frac><Native>: Look-Up Table (LUT) size of FPGA. If you have fracturable LUTs or multiple LUT circuits, this should be largest input size.
* The keyword 'frac' is to specify if fracturable LUT is used or not.
* The keyword 'Native' is to specify if fracturable LUT design is a native one (without mode switch) or a standard one (with mode switch).
- N<le\_size>: Number of logic elements for a CLB. If you have multiple CLB architectures, this should be largest number.
- adder\_chain: If hard adder/carry chain is used inside CLBs
- register\_chain: If shift register chain is used inside CLBs

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<!-- Architecture annotation for OpenFPGA framework
This annotation supports the k6_N10_40nm.xml
- General purpose logic block
- K = 6, N = 10, I = 40
- Single mode
- Routing architecture
- L = 4, fc_in = 0.15, fc_out = 0.1
-->
<openfpga_architecture>
<technology_library>
<device_library>
<device_model name="logic" type="transistor">
<lib type="industry" corner="TOP_TT" ref="M" path="${OPENFPGA_PATH}/openfpga_flow/tech/PTM_45nm/45nm.pm"/>
<design vdd="0.9" pn_ratio="2"/>
<pmos name="pch" chan_length="40e-9" min_width="140e-9" variation="logic_transistor_var"/>
<nmos name="nch" chan_length="40e-9" min_width="140e-9" variation="logic_transistor_var"/>
</device_model>
<device_model name="io" type="transistor">
<lib type="academia" ref="M" path="${OPENFPGA_PATH}/openfpga_flow/tech/PTM_45nm/45nm.pm"/>
<design vdd="2.5" pn_ratio="3"/>
<pmos name="pch_25" chan_length="270e-9" min_width="320e-9" variation="io_transistor_var"/>
<nmos name="nch_25" chan_length="270e-9" min_width="320e-9" variation="io_transistor_var"/>
</device_model>
</device_library>
<variation_library>
<variation name="logic_transistor_var" abs_deviation="0.1" num_sigma="3"/>
<variation name="io_transistor_var" abs_deviation="0.1" num_sigma="3"/>
</variation_library>
</technology_library>
<circuit_library>
<circuit_model type="inv_buf" name="INVTX1" prefix="INVTX1" is_default="true">
<design_technology type="cmos" topology="inverter" size="1"/>
<device_technology device_model_name="logic"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<delay_matrix type="rise" in_port="in" out_port="out">
10e-12
</delay_matrix>
<delay_matrix type="fall" in_port="in" out_port="out">
10e-12
</delay_matrix>
</circuit_model>
<circuit_model type="inv_buf" name="buf4" prefix="buf4" is_default="false">
<design_technology type="cmos" topology="buffer" size="1" num_level="2" f_per_stage="4"/>
<device_technology device_model_name="logic"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<delay_matrix type="rise" in_port="in" out_port="out">
10e-12
</delay_matrix>
<delay_matrix type="fall" in_port="in" out_port="out">
10e-12
</delay_matrix>
</circuit_model>
<circuit_model type="inv_buf" name="tap_buf4" prefix="tap_buf4" is_default="false">
<design_technology type="cmos" topology="buffer" size="1" num_level="3" f_per_stage="4"/>
<device_technology device_model_name="logic"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<delay_matrix type="rise" in_port="in" out_port="out">
10e-12
</delay_matrix>
<delay_matrix type="fall" in_port="in" out_port="out">
10e-12
</delay_matrix>
</circuit_model>
<circuit_model type="pass_gate" name="TGATE" prefix="TGATE" is_default="true">
<design_technology type="cmos" topology="transmission_gate" nmos_size="1" pmos_size="2"/>
<device_technology device_model_name="logic"/>
<input_buffer exist="false"/>
<output_buffer exist="false"/>
<port type="input" prefix="in" lib_name="A" size="1"/>
<port type="input" prefix="sel" lib_name="S" size="1"/>
<port type="input" prefix="selb" lib_name="SI" size="1"/>
<port type="output" prefix="out" lib_name="Y" size="1"/>
<delay_matrix type="rise" in_port="in sel selb" out_port="out">
10e-12 5e-12 5e-12
</delay_matrix>
<delay_matrix type="fall" in_port="in sel selb" out_port="out">
10e-12 5e-12 5e-12
</delay_matrix>
</circuit_model>
<circuit_model type="chan_wire" name="chan_segment" prefix="track_seg" is_default="true">
<design_technology type="cmos"/>
<input_buffer exist="false"/>
<output_buffer exist="false"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<wire_param model_type="pi" R="101" C="22.5e-15" num_level="1"/> <!-- model_type could be T, res_val and cap_val DON'T CARE -->
</circuit_model>
<circuit_model type="wire" name="direct_interc" prefix="direct_interc" is_default="true">
<design_technology type="cmos"/>
<input_buffer exist="false"/>
<output_buffer exist="false"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<wire_param model_type="pi" R="0" C="0" num_level="1"/> <!-- model_type could be T, res_val cap_val should be defined -->
</circuit_model>
<circuit_model type="mux" name="mux_2level" prefix="mux_2level" dump_structural_verilog="true">
<design_technology type="cmos" structure="multi_level" num_level="2" add_const_input="true" const_input_val="1"/>
<input_buffer exist="true" circuit_model_name="INVTX1"/>
<output_buffer exist="true" circuit_model_name="INVTX1"/>
<pass_gate_logic circuit_model_name="TGATE"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<port type="sram" prefix="sram" size="1"/>
</circuit_model>
<circuit_model type="mux" name="mux_2level_tapbuf" prefix="mux_2level_tapbuf" dump_structural_verilog="true">
<design_technology type="cmos" structure="multi_level" num_level="2" add_const_input="true" const_input_val="1"/>
<input_buffer exist="true" circuit_model_name="INVTX1"/>
<output_buffer exist="true" circuit_model_name="tap_buf4"/>
<pass_gate_logic circuit_model_name="TGATE"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<port type="sram" prefix="sram" size="1"/>
</circuit_model>
<circuit_model type="mux" name="mux_1level_tapbuf" prefix="mux_1level_tapbuf" is_default="true" dump_structural_verilog="true">
<design_technology type="cmos" structure="one_level" add_const_input="true" const_input_val="1"/>
<input_buffer exist="true" circuit_model_name="INVTX1"/>
<output_buffer exist="true" circuit_model_name="tap_buf4"/>
<pass_gate_logic circuit_model_name="TGATE"/>
<port type="input" prefix="in" size="1"/>
<port type="output" prefix="out" size="1"/>
<port type="sram" prefix="sram" size="1"/>
</circuit_model>
<!--DFF subckt ports should be defined as <D> <Q> <CLK> <RESET> <SET> -->
<circuit_model type="ff" name="DFFSRQ" prefix="DFFSRQ" spice_netlist="${OPENFPGA_PATH}/openfpga_flow/openfpga_cell_library/spice/dff.sp" verilog_netlist="${OPENFPGA_PATH}/openfpga_flow/openfpga_cell_library/verilog/dff.v">
<design_technology type="cmos"/>
<input_buffer exist="true" circuit_model_name="INVTX1"/>
<output_buffer exist="true" circuit_model_name="INVTX1"/>
<port type="input" prefix="D" size="1"/>
<port type="input" prefix="set" lib_name="SET" size="1" is_global="true" default_val="0" is_set="true"/>
<port type="input" prefix="reset" lib_name="RST" size="1" is_global="true" default_val="0" is_reset="true"/>
<port type="output" prefix="Q" size="1"/>
<port type="clock" prefix="clk" lib_name="CK" size="1" is_global="true" default_val="0" />
</circuit_model>
<circuit_model type="lut" name="frac_lut4" prefix="frac_lut4" dump_structural_verilog="true">
<design_technology type="cmos" fracturable_lut="true"/>
<input_buffer exist="true" circuit_model_name="INVTX1"/>
<output_buffer exist="true" circuit_model_name="INVTX1"/>
<lut_input_inverter exist="true" circuit_model_name="INVTX1"/>
<lut_input_buffer exist="true" circuit_model_name="buf4"/>
<lut_intermediate_buffer exist="true" circuit_model_name="buf4" location_map="-1-"/>
<pass_gate_logic circuit_model_name="TGATE"/>
<port type="input" prefix="in" size="4"/>
<!-- Without mode switcher, the LUT3 always output the lower part of level-3 MUX insider the LUT4 structure -->
<port type="output" prefix="lut3_out" size="1" lut_frac_level="3" lut_output_mask="1"/>
<port type="output" prefix="lut4_out" size="1" lut_output_mask="0"/>
<port type="sram" prefix="sram" size="16"/>
</circuit_model>
<!--Scan-chain DFF subckt ports should be defined as <D> <Q> <Qb> <CLK> <RESET> <SET> -->
<circuit_model type="ccff" name="DFFR" prefix="DFFR" spice_netlist="${OPENFPGA_PATH}/openfpga_flow/openfpga_cell_library/spice/dff.sp" verilog_netlist="${OPENFPGA_PATH}/openfpga_flow/openfpga_cell_library/verilog/dff.v">
<design_technology type="cmos"/>
<input_buffer exist="true" circuit_model_name="INVTX1"/>
<output_buffer exist="true" circuit_model_name="INVTX1"/>
<port type="input" prefix="pReset" lib_name="RST" size="1" is_global="true" default_val="0" is_reset="true" is_prog="true"/>
<port type="input" prefix="D" size="1"/>
<port type="output" prefix="Q" size="1"/>
<port type="output" prefix="QN" size="1"/>
<port type="clock" prefix="prog_clk" lib_name="CK" size="1" is_global="true" default_val="0" is_prog="true"/>
</circuit_model>
<circuit_model type="iopad" name="GPIO" prefix="GPIO" spice_netlist="${OPENFPGA_PATH}/openfpga_flow/openfpga_cell_library/spice/gpio.sp" verilog_netlist="${OPENFPGA_PATH}/openfpga_flow/openfpga_cell_library/verilog/gpio.v">
<design_technology type="cmos"/>
<input_buffer exist="true" circuit_model_name="INVTX1"/>
<output_buffer exist="true" circuit_model_name="INVTX1"/>
<port type="inout" prefix="PAD" size="1" is_global="true" is_io="true" is_data_io="true"/>
<port type="sram" prefix="DIR" size="1" mode_select="true" circuit_model_name="DFFR" default_val="1"/>
<port type="input" prefix="outpad" lib_name="A" size="1"/>
<port type="output" prefix="inpad" lib_name="Y" size="1"/>
</circuit_model>
</circuit_library>
<configuration_protocol>
<organization type="scan_chain" circuit_model_name="DFFR"/>
</configuration_protocol>
<connection_block>
<switch name="ipin_cblock" circuit_model_name="mux_2level_tapbuf"/>
</connection_block>
<switch_block>
<switch name="0" circuit_model_name="mux_2level_tapbuf"/>
</switch_block>
<routing_segment>
<segment name="L4" circuit_model_name="chan_segment"/>
</routing_segment>
<pb_type_annotations>
<!-- physical pb_type binding in complex block IO -->
<pb_type name="io" physical_mode_name="physical" idle_mode_name="inpad"/>
<pb_type name="io[physical].iopad" circuit_model_name="GPIO" mode_bits="1"/>
<pb_type name="io[inpad].inpad" physical_pb_type_name="io[physical].iopad" mode_bits="1"/>
<pb_type name="io[outpad].outpad" physical_pb_type_name="io[physical].iopad" mode_bits="0"/>
<!-- End physical pb_type binding in complex block IO -->
<!-- physical pb_type binding in complex block CLB -->
<!-- physical mode will be the default mode if not specified -->
<pb_type name="clb">
<!-- Binding interconnect to circuit models as their physical implementation, if not defined, we use the default model -->
<interconnect name="crossbar" circuit_model_name="mux_2level"/>
</pb_type>
<pb_type name="clb.fle" physical_mode_name="physical"/>
<pb_type name="clb.fle[physical].fabric.frac_logic.frac_lut4" circuit_model_name="frac_lut4"/>
<pb_type name="clb.fle[physical].fabric.ff" circuit_model_name="DFFSRQ"/>
<!-- Binding operating pb_type to physical pb_type -->
<!-- BLE3 LUT uses the frac_LUT4 of physical mode:
Index in CLB of BLE3 LUT -> Index in CLB of physical mode LUT
LUT[0] -> LUT[0]
LUT[1] -> LUT[1]
LUT[2] -> LUT[2]
...
-->
<pb_type name="clb.fle[shared_lut3_lut4].ble3.lut3" physical_pb_type_name="clb.fle[physical].fabric.frac_logic.frac_lut4">
<!-- Binding the lut3 to the first 3 inputs of fracturable lut4 -->
<port name="in" physical_mode_port="in[0:2]"/>
<port name="out" physical_mode_port="lut3_out[0:0]"/>
</pb_type>
<!-- BLE4 LUT uses the frac_LUT4 of physical mode:
Index in CLB of BLE4 LUT -> Index in CLB of physical mode LUT
LUT[0] -> LUT[0]
LUT[1] -> LUT[1]
LUT[2] -> LUT[2]
...
-->
<pb_type name="clb.fle[shared_lut3_lut4].ble4.lut4" physical_pb_type_name="clb.fle[physical].fabric.frac_logic.frac_lut4">
<!-- Binding the lut4 to the first 4 inputs of fracturable lut4 -->
<port name="in" physical_mode_port="in[0:3]"/>
<port name="out" physical_mode_port="lut4_out"/>
</pb_type>
<!-- BLE3 FF uses the first FF of physical mode:
Index in CLB of BLE3 FF -> Index in CLB of physical mode FFs
FF[0] -> FF[0]
FF[1] -> FF[2]
FF[2] -> FF[4]
...
-->
<pb_type name="clb.fle[shared_lut3_lut4].ble3.ff" physical_pb_type_name="clb.fle[physical].fabric.ff" physical_pb_type_index_factor="2" physical_pb_type_index_offset="0"/>
<!-- BLE3 FF uses the second FF of physical mode:
Index in CLB of BLE3 FF -> Index in CLB of physical mode FFs
FF[0] -> FF[1]
FF[1] -> FF[3]
FF[2] -> FF[5]
...
-->
<pb_type name="clb.fle[shared_lut3_lut4].ble4.ff" physical_pb_type_name="clb.fle[physical].fabric.ff" physical_pb_type_index_factor="2" physical_pb_type_index_offset="1"/>
<!-- End physical pb_type binding in complex block IO -->
</pb_type_annotations>
</openfpga_architecture>

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# = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
# Configuration file for running experiments
# = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
# timeout_each_job : FPGA Task script splits fpga flow into multiple jobs
# Each job execute fpga_flow script on combination of architecture & benchmark
# timeout_each_job is timeout for each job
# = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
[GENERAL]
run_engine=openfpga_shell
power_tech_file = ${PATH:OPENFPGA_PATH}/openfpga_flow/tech/PTM_45nm/45nm.xml
power_analysis = true
spice_output=false
verilog_output=true
timeout_each_job = 20*60
fpga_flow=vpr_blif
[OpenFPGA_SHELL]
openfpga_shell_template=${PATH:OPENFPGA_PATH}/openfpga_flow/openfpga_shell_scripts/example_script.openfpga
openfpga_arch_file=${PATH:OPENFPGA_PATH}/openfpga_flow/openfpga_arch/k4_fracNative_N4_40nm_cc_openfpga.xml
openfpga_sim_setting_file=${PATH:OPENFPGA_PATH}/openfpga_flow/openfpga_simulation_settings/auto_sim_openfpga.xml
[ARCHITECTURES]
arch0=${PATH:OPENFPGA_PATH}/openfpga_flow/vpr_arch/k4_fracNative_N4_tileable_40nm.xml
[BENCHMARKS]
#
bench0=${PATH:OPENFPGA_PATH}/openfpga_flow/benchmarks/micro_benchmark/and2_or2/and2_or2.blif
[SYNTHESIS_PARAM]
bench0_top = and2_or2
bench0_act = ${PATH:OPENFPGA_PATH}/openfpga_flow/benchmarks/micro_benchmark/and2_or2/and2_or2.act
bench0_verilog = ${PATH:OPENFPGA_PATH}/openfpga_flow/benchmarks/micro_benchmark/and2_or2/and2_or2.v
[SCRIPT_PARAM_MIN_ROUTE_CHAN_WIDTH]
end_flow_with_test=
vpr_fpga_verilog_formal_verification_top_netlist=

4
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@ -1,7 +1,9 @@
# Naming convention for VPR architecture files
Please reveal the following architecture features in the names to help quickly spot architecture files.
- k<lut\_size>\_<frac>: Look-Up Table (LUT) size of FPGA. If you have fracturable LUTs or multiple LUT circuits, this should be largest input size. The keyword 'frac' is to specify if fracturable LUT is used or not.
- k<lut\_size>\_<frac><Native>: Look-Up Table (LUT) size of FPGA. If you have fracturable LUTs or multiple LUT circuits, this should be largest input size.
* The keyword 'frac' is to specify if fracturable LUT is used or not.
* The keyword 'Native' is to specify if fracturable LUT design is a native one (without mode switch) or a standard one (with mode switch).
- N<le\_size>: Number of logic elements for a CLB. If you have multiple CLB architectures, this should be largest number.
- tileable: If the routing architecture is tileable or not.
- adder\_chain: If hard adder/carry chain is used inside CLBs

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<!--
Flagship Heterogeneous Architecture (No Carry Chains) for VTR 7.0.
- 40 nm technology
- General purpose logic block:
K = 4, N = 4, fracturable 4 LUTs (can operate as one 4-LUT or two 3-LUTs with all 3 inputs shared)
with optionally registered outputs
- Routing architecture: L = 4, fc_in = 0.15, Fc_out = 0.1
Details on Modelling:
Based on flagship k4_frac_N4_mem32K_40nm.xml architecture.
Authors: Jason Luu, Jeff Goeders, Vaughn Betz
-->
<architecture>
<!--
ODIN II specific config begins
Describes the types of user-specified netlist blocks (in blif, this corresponds to
".model [type_of_block]") that this architecture supports.
Note: Basic LUTs, I/Os, and flip-flops are not included here as there are
already special structures in blif (.names, .input, .output, and .latch)
that describe them.
-->
<models>
<!-- A virtual model for I/O to be used in the physical mode of io block -->
<model name="io">
<input_ports>
<port name="outpad"/>
</input_ports>
<output_ports>
<port name="inpad"/>
</output_ports>
</model>
<!-- A virtual model for I/O to be used in the physical mode of io block -->
<model name="frac_lut4">
<input_ports>
<port name="in"/>
</input_ports>
<output_ports>
<port name="lut3_out"/>
<port name="lut4_out"/>
</output_ports>
</model>
</models>
<tiles>
<!-- Do NOT add clock pins to I/O here!!! VPR does not build clock network in the way that OpenFPGA can support
If you need to register the I/O, define clocks in the circuit models
These clocks can be handled in back-end
-->
<tile name="io" capacity="8" area="0">
<equivalent_sites>
<site pb_type="io"/>
</equivalent_sites>
<input name="outpad" num_pins="1"/>
<output name="inpad" num_pins="1"/>
<fc in_type="frac" in_val="0.15" out_type="frac" out_val="0.10"/>
<pinlocations pattern="custom">
<loc side="left">io.outpad io.inpad</loc>
<loc side="top">io.outpad io.inpad</loc>
<loc side="right">io.outpad io.inpad</loc>
<loc side="bottom">io.outpad io.inpad</loc>
</pinlocations>
</tile>
<tile name="clb" area="53894">
<equivalent_sites>
<site pb_type="clb"/>
</equivalent_sites>
<input name="I" num_pins="12" equivalent="full"/>
<output name="O" num_pins="8" equivalent="none"/>
<clock name="clk" num_pins="1"/>
<fc in_type="frac" in_val="0.15" out_type="frac" out_val="0.10"/>
<pinlocations pattern="spread"/>
</tile>
</tiles>
<!-- ODIN II specific config ends -->
<!-- Physical descriptions begin -->
<layout tileable="true">
<auto_layout aspect_ratio="1.0">
<!--Perimeter of 'io' blocks with 'EMPTY' blocks at corners-->
<perimeter type="io" priority="100"/>
<corners type="EMPTY" priority="101"/>
<!--Fill with 'clb'-->
<fill type="clb" priority="10"/>
</auto_layout>
<fixed_layout name="2x2" width="4" height="4">
<!--Perimeter of 'io' blocks with 'EMPTY' blocks at corners-->
<perimeter type="io" priority="100"/>
<corners type="EMPTY" priority="101"/>
<!--Fill with 'clb'-->
<fill type="clb" priority="10"/>
</fixed_layout>
<fixed_layout name="4x4" width="6" height="6">
<!--Perimeter of 'io' blocks with 'EMPTY' blocks at corners-->
<perimeter type="io" priority="100"/>
<corners type="EMPTY" priority="101"/>
<!--Fill with 'clb'-->
<fill type="clb" priority="10"/>
</fixed_layout>
</layout>
<device>
<!-- VB & JL: Using Ian Kuon's transistor sizing and drive strength data for routing, at 40 nm. Ian used BPTM
models. We are modifying the delay values however, to include metal C and R, which allows more architecture
experimentation. We are also modifying the relative resistance of PMOS to be 1.8x that of NMOS
(vs. Ian's 3x) as 1.8x lines up with Jeff G's data from a 45 nm process (and is more typical of
45 nm in general). I'm upping the Rmin_nmos from Ian's just over 6k to nearly 9k, and dropping
RminW_pmos from 18k to 16k to hit this 1.8x ratio, while keeping the delays of buffers approximately
lined up with Stratix IV.
We are using Jeff G.'s capacitance data for 45 nm (in tech/ptm_45nm).
Jeff's tables list C in for transistors with widths in multiples of the minimum feature size (45 nm).
The minimum contactable transistor is 2.5 * 45 nm, so I need to multiply drive strength sizes in this file
by 2.5x when looking up in Jeff's tables.
The delay values are lined up with Stratix IV, which has an architecture similar to this
proposed FPGA, and which is also 40 nm
C_ipin_cblock: input capacitance of a track buffer, which VPR assumes is a single-stage
4x minimum drive strength buffer. -->
<sizing R_minW_nmos="8926" R_minW_pmos="16067"/>
<!-- The grid_logic_tile_area below will be used for all blocks that do not explicitly set their own (non-routing)
area; set to 0 since we explicitly set the area of all blocks currently in this architecture file.
-->
<area grid_logic_tile_area="0"/>
<chan_width_distr>
<x distr="uniform" peak="1.000000"/>
<y distr="uniform" peak="1.000000"/>
</chan_width_distr>
<switch_block type="wilton" fs="3" sub_type="subset" sub_fs="3"/>
<connection_block input_switch_name="ipin_cblock"/>
</device>
<switchlist>
<!-- VB: the mux_trans_size and buf_size data below is in minimum width transistor *areas*, assuming the purple
book area formula. This means the mux transistors are about 5x minimum drive strength.
We assume the first stage of the buffer is 3x min drive strength to be reasonable given the large
mux transistors, and this gives a reasonable stage ratio of a bit over 5x to the second stage. We assume
the n and p transistors in the first stage are equal-sized to lower the buffer trip point, since it's fed
by a pass transistor mux. We can then reverse engineer the buffer second stage to hit the specified
buf_size (really buffer area) - 16.2x minimum drive nmos and 1.8*16.2 = 29.2x minimum drive.
I then took the data from Jeff G.'s PTM modeling of 45 nm to get the Cin (gate of first stage) and Cout
(diff of second stage) listed below. Jeff's models are in tech/ptm_45nm, and are in min feature multiples.
The minimum contactable transistor is 2.5 * 45 nm, so I need to multiply the drive strength sizes above by
2.5x when looking up in Jeff's tables.
Finally, we choose a switch delay (58 ps) that leads to length 4 wires having a delay equal to that of SIV of 126 ps.
This also leads to the switch being 46% of the total wire delay, which is reasonable. -->
<switch type="mux" name="0" R="551" Cin=".77e-15" Cout="4e-15" Tdel="58e-12" mux_trans_size="2.630740" buf_size="27.645901"/>
<!--switch ipin_cblock resistance set to yeild for 4x minimum drive strength buffer-->
<switch type="mux" name="ipin_cblock" R="2231.5" Cout="0." Cin="1.47e-15" Tdel="7.247000e-11" mux_trans_size="1.222260" buf_size="auto"/>
</switchlist>
<segmentlist>
<!--- VB & JL: using ITRS metal stack data, 96 nm half pitch wires, which are intermediate metal width/space.
With the 96 nm half pitch, such wires would take 60 um of height, vs. a 90 nm high (approximated as square) Stratix IV tile so this seems
reasonable. Using a tile length of 90 nm, corresponding to the length of a Stratix IV tile if it were square. -->
<!-- GIVE a specific name for the segment! OpenFPGA appreciate that! -->
<segment name="L4" freq="1.000000" length="4" type="unidir" Rmetal="101" Cmetal="22.5e-15">
<mux name="0"/>
<sb type="pattern">1 1 1 1 1</sb>
<cb type="pattern">1 1 1 1</cb>
</segment>
</segmentlist>
<complexblocklist>
<!-- Define I/O pads begin -->
<!-- Capacity is a unique property of I/Os, it is the maximum number of I/Os that can be placed at the same (X,Y) location on the FPGA -->
<!-- Not sure of the area of an I/O (varies widely), and it's not relevant to the design of the FPGA core, so we're setting it to 0. -->
<pb_type name="io">
<input name="outpad" num_pins="1"/>
<output name="inpad" num_pins="1"/>
<!-- Do NOT add clock pins to I/O here!!! VPR does not build clock network in the way that OpenFPGA can support
If you need to register the I/O, define clocks in the circuit models
These clocks can be handled in back-end
-->
<!-- A mode denotes the physical implementation of an I/O
This mode will be not packable but is mainly used for fabric verilog generation
-->
<mode name="physical" disabled_in_pack="true">
<pb_type name="iopad" blif_model=".subckt io" num_pb="1">
<input name="outpad" num_pins="1"/>
<output name="inpad" num_pins="1"/>
</pb_type>
<interconnect>
<direct name="outpad" input="io.outpad" output="iopad.outpad">
<delay_constant max="1.394e-11" in_port="io.outpad" out_port="iopad.outpad"/>
</direct>
<direct name="inpad" input="iopad.inpad" output="io.inpad">
<delay_constant max="4.243e-11" in_port="iopad.inpad" out_port="io.inpad"/>
</direct>
</interconnect>
</mode>
<!-- IOs can operate as either inputs or outputs.
Delays below come from Ian Kuon. They are small, so they should be interpreted as
the delays to and from registers in the I/O (and generally I/Os are registered
today and that is when you timing analyze them.
-->
<mode name="inpad">
<pb_type name="inpad" blif_model=".input" num_pb="1">
<output name="inpad" num_pins="1"/>
</pb_type>
<interconnect>
<direct name="inpad" input="inpad.inpad" output="io.inpad">
<delay_constant max="4.243e-11" in_port="inpad.inpad" out_port="io.inpad"/>
</direct>
</interconnect>
</mode>
<mode name="outpad">
<pb_type name="outpad" blif_model=".output" num_pb="1">
<input name="outpad" num_pins="1"/>
</pb_type>
<interconnect>
<direct name="outpad" input="io.outpad" output="outpad.outpad">
<delay_constant max="1.394e-11" in_port="io.outpad" out_port="outpad.outpad"/>
</direct>
</interconnect>
</mode>
<!-- Every input pin is driven by 15% of the tracks in a channel, every output pin is driven by 10% of the tracks in a channel -->
<!-- IOs go on the periphery of the FPGA, for consistency,
make it physically equivalent on all sides so that only one definition of I/Os is needed.
If I do not make a physically equivalent definition, then I need to define 4 different I/Os, one for each side of the FPGA
-->
<!-- Place I/Os on the sides of the FPGA -->
<power method="ignore"/>
</pb_type>
<!-- Define I/O pads ends -->
<!-- Define general purpose logic block (CLB) begin -->
<!--- Area calculation: Total Stratix IV tile area is about 8100 um^2, and a minimum width transistor
area is 60 L^2 yields a tile area of 84375 MWTAs.
Routing at W=300 is 30481 MWTAs, leaving us with a total of 53000 MWTAs for logic block area
This means that only 37% of our area is in the general routing, and 63% is inside the logic
block. Note that the crossbar / local interconnect is considered part of the logic block
area in this analysis. That is a lower proportion of of routing area than most academics
assume, but note that the total routing area really includes the crossbar, which would push
routing area up significantly, we estimate into the ~70% range.
-->
<pb_type name="clb">
<input name="I" num_pins="12" equivalent="full"/>
<output name="O" num_pins="8" equivalent="none"/>
<clock name="clk" num_pins="1"/>
<!-- Describe fracturable logic element.
Each fracturable logic element has a 6-LUT that can alternatively operate as two 5-LUTs with shared inputs.
The outputs of the fracturable logic element can be optionally registered
-->
<pb_type name="fle" num_pb="4">
<input name="in" num_pins="4"/>
<output name="out" num_pins="2"/>
<clock name="clk" num_pins="1"/>
<!-- Physical mode definition begin (physical implementation of the fle) -->
<mode name="physical" disabled_in_pack="true">
<pb_type name="fabric" num_pb="1">
<input name="in" num_pins="4"/>
<output name="out" num_pins="2"/>
<clock name="clk" num_pins="1"/>
<pb_type name="frac_logic" num_pb="1">
<input name="in" num_pins="4"/>
<output name="out" num_pins="2"/>
<!-- Define a native (no mode switch) 4-input fracturable LUT
Different from standard fracturable LUT4 whose input can be tri-stated
to enable fracturable output,
The native fracturable LUT4 has a LUT3 output without any switches
to enable it. Therefore, none of its inputs will be tri-stated
The LUT3 output is directly wired to an internal point of LUT4
which can be considered a spy output
-->
<pb_type name="frac_lut4" blif_model=".subckt frac_lut4" num_pb="1">
<input name="in" num_pins="4"/>
<output name="lut3_out" num_pins="1"/>
<output name="lut4_out" num_pins="1"/>
</pb_type>
<interconnect>
<direct name="direct1" input="frac_logic.in" output="frac_lut4.in"/>
<direct name="direct2" input="frac_lut4.lut3_out[0]" output="frac_logic.out[0]"/>
<direct name="direct3" input="frac_lut4.lut4_out[0]" output="frac_logic.out[1]"/>
</interconnect>
</pb_type>
<!-- Define flip-flop -->
<pb_type name="ff" blif_model=".latch" num_pb="2" class="flipflop">
<input name="D" num_pins="1" port_class="D"/>
<output name="Q" num_pins="1" port_class="Q"/>
<clock name="clk" num_pins="1" port_class="clock"/>
<T_setup value="66e-12" port="ff.D" clock="clk"/>
<T_clock_to_Q max="124e-12" port="ff.Q" clock="clk"/>
</pb_type>
<interconnect>
<direct name="direct1" input="fabric.in" output="frac_logic.in"/>
<direct name="direct2" input="frac_logic.out[1:0]" output="ff[1:0].D"/>
<complete name="direct3" input="fabric.clk" output="ff[1:0].clk"/>
<mux name="mux1" input="ff[0].Q frac_logic.out[0]" output="fabric.out[0]">
<!-- LUT to output is faster than FF to output on a Stratix IV -->
<delay_constant max="25e-12" in_port="frac_logic.out[0]" out_port="fabric.out[0]"/>
<delay_constant max="45e-12" in_port="ff[0].Q" out_port="fabric.out[0]"/>
</mux>
<mux name="mux2" input="ff[1].Q frac_logic.out[1]" output="fabric.out[1]">
<!-- LUT to output is faster than FF to output on a Stratix IV -->
<delay_constant max="25e-12" in_port="frac_logic.out[1]" out_port="fabric.out[1]"/>
<delay_constant max="45e-12" in_port="ff[1].Q" out_port="fabric.out[1]"/>
</mux>
</interconnect>
</pb_type>
<interconnect>
<direct name="direct1" input="fle.in" output="fabric.in"/>
<direct name="direct2" input="fabric.out" output="fle.out"/>
<direct name="direct3" input="fle.clk" output="fabric.clk"/>
</interconnect>
</mode>
<!-- Physical mode definition end (physical implementation of the fle) -->
<!-- 3-LUT + LUT4 with shared inputs mode definition begin -->
<mode name="shared_lut3_lut4">
<pb_type name="ble3" num_pb="1">
<input name="in" num_pins="3"/>
<output name="out" num_pins="1"/>
<clock name="clk" num_pins="1"/>
<!-- Define LUT3 -->
<pb_type name="lut3" blif_model=".names" num_pb="1" class="lut">
<input name="in" num_pins="3" port_class="lut_in"/>
<output name="out" num_pins="1" port_class="lut_out"/>
<!-- LUT timing using delay matrix -->
<delay_matrix type="max" in_port="lut3.in" out_port="lut3.out">
235e-12
235e-12
235e-12
</delay_matrix>
</pb_type>
<!-- Define the flip-flop -->
<pb_type name="ff" blif_model=".latch" num_pb="1" class="flipflop">
<input name="D" num_pins="1" port_class="D"/>
<output name="Q" num_pins="1" port_class="Q"/>
<clock name="clk" num_pins="1" port_class="clock"/>
<T_setup value="66e-12" port="ff.D" clock="clk"/>
<T_clock_to_Q max="124e-12" port="ff.Q" clock="clk"/>
</pb_type>
<interconnect>
<direct name="direct1" input="ble3.in[2:0]" output="lut3[0:0].in[2:0]"/>
<direct name="direct2" input="lut3[0:0].out" output="ff[0:0].D">
<!-- Advanced user option that tells CAD tool to find LUT+FF pairs in netlist -->
<pack_pattern name="ble3" in_port="lut3[0:0].out" out_port="ff[0:0].D"/>
</direct>
<direct name="direct3" input="ble3.clk" output="ff[0:0].clk"/>
<mux name="mux1" input="ff[0:0].Q lut3.out[0:0]" output="ble3.out[0:0]">
<!-- LUT to output is faster than FF to output on a Stratix IV -->
<delay_constant max="25e-12" in_port="lut3.out[0:0]" out_port="ble3.out[0:0]"/>
<delay_constant max="45e-12" in_port="ff[0:0].Q" out_port="ble3.out[0:0]"/>
</mux>
</interconnect>
</pb_type>
<pb_type name="ble4" num_pb="1">
<input name="in" num_pins="4"/>
<output name="out" num_pins="1"/>
<clock name="clk" num_pins="1"/>
<!-- Define LUT4 -->
<pb_type name="lut4" blif_model=".names" num_pb="1" class="lut">
<input name="in" num_pins="4" port_class="lut_in"/>
<output name="out" num_pins="1" port_class="lut_out"/>
<!-- LUT timing using delay matrix -->
<delay_matrix type="max" in_port="lut4.in" out_port="lut4.out">
261e-12
261e-12
261e-12
261e-12
</delay_matrix>
</pb_type>
<!-- Define the flip-flop -->
<pb_type name="ff" blif_model=".latch" num_pb="1" class="flipflop">
<input name="D" num_pins="1" port_class="D"/>
<output name="Q" num_pins="1" port_class="Q"/>
<clock name="clk" num_pins="1" port_class="clock"/>
<T_setup value="66e-12" port="ff.D" clock="clk"/>
<T_clock_to_Q max="124e-12" port="ff.Q" clock="clk"/>
</pb_type>
<interconnect>
<direct name="direct1" input="ble4.in[3:0]" output="lut4[0:0].in[3:0]"/>
<direct name="direct2" input="lut4[0:0].out" output="ff[0:0].D">
<!-- Advanced user option that tells CAD tool to find LUT+FF pairs in netlist -->
<pack_pattern name="ble4" in_port="lut4[0:0].out" out_port="ff[0:0].D"/>
</direct>
<direct name="direct3" input="ble4.clk" output="ff[0:0].clk"/>
<mux name="mux1" input="ff[0:0].Q lut4.out[0:0]" output="ble4.out[0:0]">
<!-- LUT to output is faster than FF to output on a Stratix IV -->
<delay_constant max="25e-12" in_port="lut4.out[0:0]" out_port="ble4.out[0:0]"/>
<delay_constant max="45e-12" in_port="ff[0:0].Q" out_port="ble4.out[0:0]"/>
</mux>
</interconnect>
</pb_type>
<interconnect>
<direct name="direct1" input="fle.in[2:0]" output="ble3.in"/>
<direct name="direct2" input="fle.in[3:0]" output="ble4.in"/>
<direct name="direct3" input="ble3.out" output="fle.out[0:0]"/>
<direct name="direct4" input="ble4.out" output="fle.out[1:1]"/>
<direct name="direct5" input="fle.clk" output="ble3.clk"/>
<direct name="direct6" input="fle.clk" output="ble4.clk"/>
</interconnect>
</mode>
<!-- Dual 3-LUT mode definition end -->
</pb_type>
<interconnect>
<!-- We use a full crossbar to get logical equivalence at inputs of CLB
The delays below come from Stratix IV. the delay through a connection block
input mux + the crossbar in Stratix IV is 167 ps. We already have a 72 ps
delay on the connection block input mux (modeled by Ian Kuon), so the remaining
delay within the crossbar is 95 ps.
The delays of cluster feedbacks in Stratix IV is 100 ps, when driven by a LUT.
Since all our outputs LUT outputs go to a BLE output, and have a delay of
25 ps to do so, we subtract 25 ps from the 100 ps delay of a feedback
to get the part that should be marked on the crossbar. -->
<complete name="crossbar" input="clb.I fle[3:0].out" output="fle[3:0].in">
<delay_constant max="95e-12" in_port="clb.I" out_port="fle[3:0].in"/>
<delay_constant max="75e-12" in_port="fle[3:0].out" out_port="fle[3:0].in"/>
</complete>
<complete name="clks" input="clb.clk" output="fle[3:0].clk">
</complete>
<!-- This way of specifying direct connection to clb outputs is important because this architecture uses automatic spreading of opins.
By grouping to output pins in this fashion, if a logic block is completely filled by 6-LUTs,
then the outputs those 6-LUTs take get evenly distributed across all four sides of the CLB instead of clumped on two sides (which is what happens with a more
naive specification).
-->
<direct name="clbouts1" input="fle[3:0].out[0:0]" output="clb.O[3:0]"/>
<direct name="clbouts2" input="fle[3:0].out[1:1]" output="clb.O[7:4]"/>
</interconnect>
<!-- Every input pin is driven by 15% of the tracks in a channel, every output pin is driven by 10% of the tracks in a channel -->
<!-- Place this general purpose logic block in any unspecified column -->
</pb_type>
<!-- Define general purpose logic block (CLB) ends -->
</complexblocklist>
</architecture>