yosys/techlibs/gowin/brams.txt

ram block $__GOWIN_SP_ {
	abits 14;
	widths 1 2 4 9 18 36 per_port;
	cost 128;
	byte 9;
	init no_undef;
	port srsw "A" {
		clock posedge;
		clken;
		option "RESET_MODE" "SYNC" {
			rdsrst zero ungated;
		}
		option "RESET_MODE" "ASYNC" {
			rdarst zero;
		}
		rdinit zero;
		portoption "WRITE_MODE" 0 {
			rdwr no_change;
		}
		portoption "WRITE_MODE" 1 {
			rdwr new;
		}
		ifndef gw5a {
			portoption "WRITE_MODE" 2 {
				rdwr old;
			}
		}
		wrbe_separate;
	}
}

ram block $__GOWIN_DP_ {
	abits 14;
	widths 1 2 4 9 18 per_port;
	cost 128;
	byte 9;
	init no_undef;
	port srsw "A" "B" {
		clock posedge;
		clken;
		option "RESET_MODE" "SYNC" {
			rdsrst zero ungated;
		}
		option "RESET_MODE" "ASYNC" {
			rdarst zero;
		}
		rdinit zero;
		portoption "WRITE_MODE" 0 {
			rdwr no_change;
		}
		portoption "WRITE_MODE" 1 {
			rdwr new;
		}
		ifndef gw5a {
			portoption "WRITE_MODE" 2 {
				rdwr old;
			}
		}
		wrbe_separate;
	}
}

ram block $__GOWIN_SDP_ {
	abits 14;
	widths 1 2 4 9 18 36 per_port;
	cost 128;
	byte 9;
	init no_undef;
	port sr "R" {
		clock posedge;
		clken;
		option "RESET_MODE" "SYNC" {
			rdsrst zero ungated;
		}
		option "RESET_MODE" "ASYNC" {
			rdarst zero;
		}
		rdinit zero;
	}
	port sw "W" {
		clock posedge;
		clken;
		wrbe_separate;
	}
}