Files
nextpnr/gowin
YRabbit 95ace0fade gowin: Add support for OSER primitives
* placement of OSER4, OVIDEO, OSER8 and SER10 primitives is supported;
* primitives are implemented for the GW1N-1, GW1NZ-1, GW1NSR-4C,
  GW1NR-9, GW1NR-9C chips;
* the initial support for special HCLK clock wires is implemented to the
  extent necessary for OSER primitives to function;
* output to both regular IO and TLVDS_OBUF is supported;
* tricks required for IOLOGIC to work on one side of the -9 and -9C
  chips are taken into account;
* various edits, such as using idf() instead of the local buffer.

Compatible with old apicula bases.

Signed-off-by: YRabbit <[email protected]>
2023-03-23 12:37:53 +01:00
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