yosys/techlibs/efinix/brams.txt

ram block $__EFINIX_5K_ {
	abits 12;
	widths 1 2 5 10 20 per_port;
	cost 32;
	init no_undef;
	port sr "R" {
		clock anyedge;
		rden;
	}
	port sw "W" {
		clock anyedge;
		option "WRITE_MODE" "READ_FIRST" {
			wrtrans "R" old;
		}
		option "WRITE_MODE" "WRITE_FIRST" {
			wrtrans "R" new;
		}
	}
}