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[Doc] Update documentation about FF circuit models to show capability in modeling SCFFs

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tangxifan 2021-01-04 18:30:04 -07:00
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96
docs/source/manual/arch_lang/circuit_model_examples.rst
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@ -979,18 +979,18 @@ This example shows:
.. _circuit_model_ccff_example:
Configuration-chain Flip-flop
`````````````````````````````
Regular Configuration-chain Flip-flop
`````````````````````````````````````
:numref:`fig_ccff` illustrates an example of scan-chain flop-flop used to build a configuration chain.
:numref:`fig_ccff_config_chain` illustrates an example of standard flip-flops used to build a configuration chain.
.. _fig_ccff:
.. _fig_ccff_config_chain:
.. figure:: ./figures/scff.png
.. figure:: ./figures/config_chain.svg
:scale: 50%
:alt: SCFF symbol
An example of a Scan-Chain Flip-Flop.
An example of a Flip-Flop organized in a chain.
The code describing this FF is:
@ -999,14 +999,94 @@ The code describing this FF is:
<circuit_model type="ccff" name="ccff" prefix="ccff" verilog_netlist="ccff.v" spice_netlist="ccff.sp">
<port type="input" prefix="D" size="1"/>
<port type="output" prefix="Q" size="1"/>
<port type="output" prefix="Qb" size="1"/>
<port type="clock" prefix="CK" size="1" is_global="true"/>
<port type="output" prefix="QN" size="1"/>
<port type="clock" prefix="CK" size="1" is_global="true" is_prog="true" is_clock="true"/>
</circuit_model>
This example shows:
- A configuration-chain flip-flop which is defined in a Verilog netlist ``ccff.v`` and a SPICE netlist ``ccff.sp``
- The flip-flop has a global clock port, ``CK``, which will be wired a global programming clock
.. note::
The output ports of the configuration flip-flop must follow a fixed sequence in definition:
- The first output port **MUST** be the data output port, e.g., ``Q``.
- The second output port **MUST** be the **inverted** data output port, e.g., ``QN``.
Configuration-chain Flip-flop with Configure Enable Signals
```````````````````````````````````````````````````````````
Configuration chain could be built with flip-flops with outputs that are enabled by specific signals.
Consider the example in :numref:`fig_ccff_config_chain_config_enable`, the flip-flop has
- a configure enable signal ``CFG_EN`` to release the data output ``Q`` and ``QN``
- a pair of data outputs ``Q`` and ``QN`` which are controlled by the configure enable signal ``CFG_EN``
- a regular data output ``SCAN_Q`` which outputs registered data
.. _fig_ccff_config_chain_config_enable:
.. figure:: ./figures/config_chain_config_enable.svg
:scale: 50%
:alt: SCFF symbol
An example of a Flip-Flop with config enable feature organized in a chain.
The code describing this FF is:
.. code-block:: xml
<circuit_model type="ccff" name="ccff" prefix="ccff" verilog_netlist="ccff.v" spice_netlist="ccff.sp">
<port type="input" prefix="CFG_EN" size="1" is_global="true" is_config_enable="true"/>
<port type="input" prefix="D" size="1"/>
<port type="output" prefix="SCAN_Q" size="1"/>
<port type="output" prefix="QN" size="1"/>
<port type="output" prefix="Q" size="1"/>
<port type="clock" prefix="CK" size="1" is_global="true" is_prog="true" is_clock="true"/>
</circuit_model>
.. note::
The output ports of the configuration flip-flop must follow a fixed sequence in definition:
- The first output port **MUST** be the regular data output port, e.g., ``SCAN_Q``.
- The second output port **MUST** be the **inverted** data output port which is activated by the configure enable signal, e.g., ``QN``.
- The second output port **MUST** be the data output port which is activated by the configure enable signal, e.g., ``Q``.
Configuration-chain Flip-flop with Scan Input
`````````````````````````````````````````````
Configuration chain could be built with flip-flops with a scan chain input .
Consider the example in :numref:`fig_ccff_config_chain_scan_capable`, the flip-flop has
- an additional input ``SI`` to enable scan-chain capabaility
- a configure enable signal ``CFG_EN`` to release the data output ``Q`` and ``QN``
- a pair of data outputs ``Q`` and ``QN`` which are controlled by the configure enable signal ``CFG_EN``
- a regular data output ``SCAN_Q`` which outputs registered data
.. _fig_ccff_config_chain_scan_capable:
.. figure:: ./figures/config_chain_scan_capable.svg
:scale: 50%
:alt: SCFF symbol
An example of a Flip-Flop with scan input organized in a chain.
The code describing this FF is:
.. code-block:: xml
<circuit_model type="ccff" name="ccff" prefix="ccff" verilog_netlist="ccff.v" spice_netlist="ccff.sp">
<port type="input" prefix="CFG_EN" size="1" is_global="true" is_config_enable="true"/>
<port type="input" prefix="D" size="1"/>
<port type="input" prefix="SI" size="1"/>
<port type="output" prefix="SCAN_Q" size="1"/>
<port type="output" prefix="QN" size="1"/>
<port type="output" prefix="Q" size="1"/>
<port type="clock" prefix="CK" size="1" is_global="true" is_prog="true" is_clock="true"/>
</circuit_model>
.. note::
The input ports of the configuration flip-flop must follow a fixed sequence in definition:
- The first input port **MUST** be the regular data input port, e.g., ``D``.
- The second input port **MUST** be the scan input port, e.g., ``SI``.
Hard Logics
~~~~~~~~~~~

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