52 lines
3.8 KiB
ReStructuredText
52 lines
3.8 KiB
ReStructuredText
.. _arch_generality:
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General Hierarchy
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-----------------
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OpenFPGA uses separated XMLs file other than the VPR8 architecture description file.
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This is to keep a loose integration to VPR8 so that OpenFPGA can easily integrate any future version of VPR with least engineering effort.
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However, to implement a physical FPGA, OpenFPGA requires the original VPR XML to include full physical design details.
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Full syntax can be found in :ref:`addon_vpr_syntax`.
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The OpenFPGA requires two XML files: an architecture description file and a simulation setting description file.
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OpenFPGA Architecture Description File
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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This file contains device-level and circuit-level details as well as annotations to the original VPR architecture.
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It contains a root node called ``<openfpga_architecture>`` under which architecture-level information, such as device-level description, circuit-level and architecture annotations to original VPR architecture XML are defined.
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It consists of the following code blocks
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- ``<circuit_library>`` includes a number of ``circuit_model``, each of which describe a primitive block in FPGA architecture, such as Look-Up Tables and multiplexers. Full syntax can be found in :ref:`circuit_library`.
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- ``<technology_library>`` includes transistor-level parameters, where users can specify which transistor models are going to be used when building the ``circuit models``. Full syntax can be found in :ref:`technology_library`.
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- ``<configuration_protocol>`` includes detailed description on the configuration protocols to be used in FPGA fabric. Full syntax can be found in :ref:`config_protocol`.
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- ``<connection_block>`` includes annotation on the connection block definition ``<connection_block>`` in original VPR XML. Full syntax can be found in :ref:`annotate_vpr_arch`.
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- ``<switch_block>`` includes annotation on the switch block definition ``<switchlist>`` in original VPR XML. Full syntax can be found in :ref:`annotate_vpr_arch`.
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- ``<routing_segment>`` includes annotation on the routing segment definition ``<segmentlist>`` in original VPR XML. Full syntax can be found in :ref:`annotate_vpr_arch`.
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- ``<direct_connection>`` includes annotation on the inter-tile direct connection definitioin ``<directlist>`` in original VPR XML. Full syntax can be found in :ref:`direct_interconnect`.
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- ``<pb_type_annotation>`` includes annotation on the programmable block architecture ``<complexblocklist>`` in original VPR XML. Full syntax can be found in :ref:`annotate_vpr_arch`.
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.. note:: ``<technology_library>`` will be applied to ``circuit_model`` when running FPGA-SPICE. It will not impact FPGA-Verilog, FPGA-Bitstream, FPGA-SDC.
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OpenFPGA Simulation Setting File
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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This file contains parameters required by testbench generators.
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It contains a root node ``<openfpga_simulation_setting>``, under which all the parameters to be used in generate testbenches in simulation purpose are defined.
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It consists of the following code blocks
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- ``<clock_setting>`` defines the clock-related settings in simulation, such as clock frequency and number of clock cycles to be used.
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- ``<simulator_option>`` defines universal options available in both HDL and SPICE simulators. This is mainly used by :ref:`fpga_spice`.
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- ``<monte_carlo>`` defines critical parameters to be used in monte-carlo simulations. This is used by :ref:`fpga_spice`.
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- ``<measurement_setting>`` defines the parameters used to measure signal slew and delays. This is used by :ref:`fpga_spice`.
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- ``<stimulus>`` defines the parameters used to generate voltage stimuli in testbenches. This is used by :ref:`fpga_spice`.
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Full syntax can be found in :ref:`simulation_setting`.
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.. note:: the parameters in ``<clock_setting>`` will be applied to both FPGA-Verilog and FPGA-SPICE simulations
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