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[ci skip] update docs with chip id pin

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Ella Schwarz
2024-01-02 14:23:07 -08:00
parent e7ed33244a
commit 8a4fc7c82f
1 changed files with 12 additions and 0 deletions
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docs/Generators/TestChipIP.rst
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@@ -92,3 +92,15 @@ The SPI flash model is a device that models a simple SPI flash device. It curren
only supports single read, quad read, single write, and quad write instructions. The
memory is backed by a file which is provided using ``+spiflash#=<NAME_OF_FILE>``,
where ``#`` is the SPI flash ID (usually ``0``).
Chip ID Pin
---------------
The chip ID pin sets the chip ID for the chip it is added to. This is most useful in
multi-chip configs. The pin value is driven by the chip ID value set in the harness
binder and the chip ID value can be read through MMIO at the address ``0x2000`` by default.
The pin can be added to a system with the ``testchipip.soc.WithChipIdPin`` config. The pin
width and MMIO address are parameterizable and can be set by passing ``ChipIdPinParams`` as an
argument to the config. The width can additionally be set using the ``testchipip.soc.WithChipIdPinWidth``
config.