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fixed sky130 commercial/openroad tutorials

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nayiri-k
2022-09-29 13:03:27 -07:00
parent e023cb0357
commit 7a4a3999af
2 changed files with 46 additions and 55 deletions
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34
docs/VLSI/Sky130-Commercial-Tutorial.rst
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@@ -26,7 +26,7 @@ This example gives a suggested file structure and build system. The ``vlsi/`` fo
* Entry point to Hammer. Contains example placeholders for hooks.
* ``example-sky130.yml``, ``example-tools.yml``
* ``example-sky130.yml``, ``example-tools.yml``, ``example-designs/sky130-commercial.yml``
* Hammer IR for this tutorial.
@@ -74,11 +74,21 @@ To elaborate the ``TinyRocketConfig`` and set up all prerequisites for the build
.. code-block:: shell
make buildfile tech_name=sky130 CONFIG=TinyRocketConfig
make buildfile tutorial=sky130-commercial
The ``CONFIG=TinyRocketConfig`` selects the target generator config in the same manner as the rest of the Chipyard framework. This elaborates a stripped-down Rocket Chip in the interest of minimizing tool runtime.
The command ``make buildfile`` generates a set of Make targets in ``build/hammer.d``.
It needs to be re-run if environment variables are changed.
It is recommended that you edit these variables directly in the Makefile rather than exporting them to your shell environment.
For the curious, ``make buildfile`` generates a set of Make targets in ``build/hammer.d``. It needs to be re-run if environment variables are changed. It is recommended that you edit these variables directly in the Makefile rather than exporting them to your shell environment.
For the purpose of brevity, in this tutorial we will set the Make variable ``tutorial=sky130-commercial``,
which will cause additional variables to be set in ``tutorial.mk``, a few of which are summarized as follows:
* ``CONFIG=TinyRocketConfig`` selects the target generator config in the same manner as the rest of the Chipyard framework. This elaborates a stripped-down Rocket Chip in the interest of minimizing tool runtime.
* ``tech_name=sky130`` sets a few more necessary paths in the ``Makefile``, such as the appropriate Hammer plugin
* ``TOOLS_CONF`` and ``TECH_CONF`` select the approproate YAML configuration files, ``example-tools.yml`` and ``example-sky130.yml``, which are described below
* ``DESIGN_CONF`` and ``EXTRA_CONFS`` allow for additonal design-specific overrides of the Hammer IR in ``example-sky130.yml``
* ``VLSI_OBJ_DIR=build-sky130-commercial`` gives the build directory a unique name to allow running multiple flows in the same repo. Note that for the rest of the tutorial we will still refer to this directory in file paths as ``build``, again for brevity.
* ``VLSI_TOP`` is by default ``ChipTop``, which is the name of the top-level Verilog module generated in the Chipyard SoC configs. By instead setting ``VLSI_TOP=Rocket``, we can use the Rocket core as the top-level module for the VLSI flow, which consists only of a single RISC-V core (and no caches, peripherals, buses, etc). This is useful to run through this tutorial quickly, and does not rely on any SRAMs.
Running the VLSI Flow
---------------------
@@ -96,12 +106,16 @@ First, set ``technology.sky130.sky130A/sky130_nda/openram_lib`` to the absolute
`Sky130 Hammer plugin README <https://github.com/ucb-bar/hammer/blob/master/src/hammer-vlsi/technology/sky130/README.md>`__
for details about the PDK setup.
example-tools.yml
^^^^^^^^^^^^^^^^^
This contains the Hammer configuration for a commercial tool flow.
It selects tools for synthesis (Cadence Genus), place and route (Cadence Innovus), DRC and LVS (Mentor Calibre).
Synthesis
^^^^^^^^^
.. code-block:: shell
make syn tech_name=sky130 CONFIG=TinyRocketConfig
make syn tutorial=sky130-commercial
Post-synthesis logs and collateral are in ``build/syn-rundir``. The raw quality of results data is available at ``build/syn-rundir/reports``, and methods to extract this information for design space exploration are a work in progress.
@@ -109,7 +123,7 @@ Place-and-Route
^^^^^^^^^^^^^^^
.. code-block:: shell
make par tech_name=sky130 CONFIG=TinyRocketConfig
make par tutorial=sky130-commercial
After completion, the final database can be opened in an interactive Innovus session via ``./build/par-rundir/generated-scripts/open_chip``.
@@ -123,9 +137,9 @@ To run DRC & LVS, and view the results in Calibre:
.. code-block:: shell
make drc tech_name=sky130 CONFIG=TinyRocketConfig
make drc tutorial=sky130-commercial
./build/chipyard.TestHarness.TinyRocketConfig-ChipTop/drc-rundir/generated-scripts/view_drc
make lvs tech_name=sky130 CONFIG=TinyRocketConfig
make lvs tutorial=sky130-commercial
./build/chipyard.TestHarness.TinyRocketConfig-ChipTop/lvs-rundir/generated-scripts/view_lvs
Some DRC errors are expected from this PDK, especially with regards to the SRAMs, as explained in the
@@ -138,7 +152,7 @@ Simulation with VCS is supported, and can be run at the RTL- or gate-level (post
.. code-block:: shell
make sim-rtl CONFIG=TinyRocketConfig BINARY=$RISCV/riscv64-unknown-elf/share/riscv-tests/isa/rv64ui-p-simple
make sim-rtl tutorial=sky130-commercial BINARY=$RISCV/riscv64-unknown-elf/share/riscv-tests/isa/rv64ui-p-simple
Post-synthesis and post-P&R simulations use the ``sim-syn`` and ``sim-par`` make targets, respectively.
@@ -150,7 +164,7 @@ Post-P&R power and rail (IR drop) analysis is supported with Voltus:
.. code-block:: shell
make power-par tech_name=sky130 CONFIG=TinyRocketConfig
make power-par tutorial=sky130-commercial
If you append the ``BINARY`` variable to the command, it will use the activity file generated from a ``sim-<syn/par>-debug`` run and report dynamic power & IR drop from the toggles encoded in the waveform.