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Author SHA1 Message Date
YRabbit c4b3268e90 gowin: Himbaechel. Add the LUTRAM 
- RAM16SDP1, RAM16SDP2 and RAM16SDP4 support;
    - Reading in these primitives is asynchronous, but we have taken
      measures so that DFF Bels remain unoccupied and they can be used
      to implement synchronous reading.
    - misc fixes.

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
 2023-08-31 08:28:09 +02:00
YRabbit c9b23a01db gowin: Himbaechel. Add ALU. 
- Added support for ALU running in "2" ADDSUB mode, the mode that yosys generates for gowin;
- Supports specifying an arbitrary input carry as well as passing the output carry to logic;
- A small restructuring of the source files.

Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
 2023-08-31 08:28:09 +02:00