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inverters.
Note: this change does NOT affect pin functionality or naming, and
does not require modifying your design. It does however affect some
board files, where keywords corresponding to active low pins will have
to be adjusted:
SPIResource(0, cs="C1", ...) → SPIResource(0, cs_n="C1", ...)
The new naming scheme will make it easier to write and audit board
files by clearly marking inverted pins in resource factories, similarly to
how `PinsN` indicates the same in bare resources.
Fixes #129.
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See #104.
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Also, fixes a typo that affected PHYs with rst specified
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The new names follow the OSHWA convention described at:
https://www.oshwa.org/a-resolution-to-redefine-spi-signal-names/
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UARTResource gets a new argument, "role", which determines flow
control signal directions:
- DCE means that the design acts as a modem
- DTE means that the design acts as a PC
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The current hierarchy isn't particularly well suited to resources
like SDRAM or NOR flash, so make it much less fine-grained but easier
to use and less nitpicky.
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