yosys/techlibs/ecp5/brams.txt

ram block $__ECP5_DP16KD_ {
	abits 14;
	widths 1 2 4 9 18 per_port;
	byte 9;
	cost 128;
	init no_undef;
	port srsw "A" "B" {
		clock anyedge;
		clken;
		wrbe_separate;
		portoption "WRITEMODE" "NORMAL" {
			rdwr no_change;
		}
		portoption "WRITEMODE" "WRITETHROUGH" {
			rdwr new;
		}
		portoption "WRITEMODE" "READBEFOREWRITE" {
			rdwr old;
		}
		option "RESETMODE" "SYNC" {
			rdsrst zero ungated block_wr;
		}
		option "RESETMODE" "ASYNC" {
			rdarst zero;
		}
		rdinit zero;
	}
}

ram block $__ECP5_PDPW16KD_ {
	abits 14;
	widths 1 2 4 9 18 36 per_port;
	byte 9;
	cost 128;
	init no_undef;
	port sr "R" {
		clock anyedge;
		clken;
		option "RESETMODE" "SYNC" {
			rdsrst zero ungated;
		}
		option "RESETMODE" "ASYNC" {
			rdarst zero;
		}
		rdinit zero;
	}
	port sw "W" {
		width 36;
		clock anyedge;
		clken;
	}
}