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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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The new names follow the OSHWA convention described at:
https://www.oshwa.org/a-resolution-to-redefine-spi-signal-names/
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The semantics should be that a high bit of data mask (UB#LB#) enables
the write to the corresponding byte.
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LB# and UB# enable writing their corresponding byte. The "m" in "dm"
means mask; that is, logical high masks (prevents) the byte from
being written. This means that it should use Pins(), not PinsN(),
to get the behavior implied by "mask".
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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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