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base repository: whitequark/glasgow
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Commits on Jan 13, 2019

  1. gateware: use SB_GB_IO instead of SB_IO+SB_GB to reduce delay. 

    Unfortunately, this takes liberties with the FX2 interface; the data
is now captured on falling edge, so instead of one full cycle of
data validity there is only a half cycle. However, the FX2 interface
was certainly broken before, and it seems less broken to me now, so
I am committing this anyway.

Ideally, the FX2 interface would register the input on the next
rising edge. However, this would add two registers in the input path,
and we are already using the INFM1 bit in the FX2. Therefore, adding
this register would require a radical rethinking of the entire FX2
interface.

See GlasgowEmbedded#89.
    @whitequark
    whitequark committed Jan 13, 2019
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