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handle asap7 lack of memories in makefile

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Colin Schmidt
2019-10-16 10:32:56 -07:00
parent 784bff2666
commit b0b6466c22
2 changed files with 7 additions and 4 deletions
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docs/VLSI/Tutorial.rst
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@@ -82,10 +82,9 @@ To elaborate the ``Sha3RocketConfig`` (Rocket Chip w/ the accelerator) and set u
.. code-block:: shell
export MACROCOMPILER_MODE='--mode synflops'
make buildfile CONFIG=Sha3RocketConfig VLSI_TOP=Sha3AccelwBB
make buildfile MACROCOMPILER_MODE='--mode synflops' CONFIG=Sha3RocketConfig VLSI_TOP=Sha3AccelwBB
The ``MACROCOMPILER_MODE='--mode synflops'`` is needed because the ASAP7 process does not yet have a memory compiler, so flip-flop arrays are used instead. This will dramatically increase the synthesis runtime if your design has a lot of memory state (e.g. large caches).
The ``MACROCOMPILER_MODE='--mode synflops'`` is needed because the ASAP7 process does not yet have a memory compiler, so flip-flop arrays are used instead. This will dramatically increase the synthesis runtime if your design has a lot of memory state (e.g. large caches). This change is automatically inferred by the makefile but is included here for completeness.
The ``CONFIG=Sha3RocketConfig`` selects the target generator config in the same manner as the rest of the Chipyard framework. This elaborates a Rocket Chip with the Sha3Accel module.