techlibs/gowin/dram.txt

bram $__GW1NR_RAM16S4
  init 1
  abits 4
  dbits 4
  groups 2
  ports  1 1
  wrmode 0 1
  enable 0 1
  transp 0 1
  clocks 0 1
  clkpol 0 1
endbram

match $__GW1NR_RAM16S4
  make_outreg
  min wports 1
endmatch