Tested all the accepted configurations in eXpreso, disabling the RBRAM2 configs that fail to place, and increasing the cost for the double site TDP memories.
Specifically, the SDP configurations for RBRAM (ignoring 2048x09 because it makes the memlib format unhappy).
Drop the unused defines from the synth pass.
Remove comments from the lutram files referencing xilinx.
Allows files to be cleaned with `make clean`, without which it breaks out-of-tree builds if an in-tree build has previously run and subsequently cleaned.
For these primitives, Gowin decided to use a different option for
describing ports—directly in the module header, i.e.
``` verilog
module ADC(input CLK);
```
instead of
``` verilog
module ADC(CLK);
input CLK;
```
Since this one-time parser becomes too confusing, it is easier to simply
add ADC descriptions as they are from a separate file, especially since
these primitives are only available in the GW5A series.
Test:
``` shell
yosys -p "read_verilog top.v; synth_gowin -json top-synth.json -family gw5a"
```
The old version of Yosys simply won't compile the design due to the lack
of port descriptions, while the new version will compile without errors.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
Process the WRITE_MODE in the GW5A series in a more concise manner.
You can check it in the same way as in
https://github.com/YosysHQ/yosys/pull/5440
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
All supported (and planned to be supported) GW5A series chips do not
support the 2: Read-before-Write write mode.
Here, we prohibit the generation of BSRAM with this mode.
Signed-off-by: YRabbit <rabbit@yrabbit.cyou>
