yosys/techlibs/lattice/brams_8kc.txt

ram block $__DP8KC_ {
	abits 13;
	widths 1 2 4 9 per_port;
	cost 64;
	init no_undef;
	port srsw "A" "B" {
		clock posedge;
		clken;
		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 $__PDPW8KC_ {
	abits 13;
	widths 1 2 4 9 18 per_port;
	byte 9;
	cost 64;
	init no_undef;
	port sr "R" {
		# width 2 cannot be supported because of quirks
		# of the primitive, and memlib requires us to
		# remove width 1 as well
		width 4 9 18;
		clock posedge;
		clken;
		option "RESETMODE" "SYNC" {
			rdsrst zero ungated;
		}
		option "RESETMODE" "ASYNC" {
			rdarst zero;
		}
		rdinit zero;
	}
	port sw "W" {
		width 18;
		clock posedge;
		clken;
	}
}