yosys/techlibs/nanoxplore/brams.txt

ram block $__NX_RAM_ {
	option "STD_MODE" "NOECC_48kx1" {
		# only 32k used
		abits 15;
		widths 1 per_port;
	}
	option "STD_MODE" "NOECC_24kx2" {
		# only 16k used
		abits 14;
		widths 2 per_port;
	}
	option "STD_MODE" "NOECC_16kx3" {
		abits 14;
		widths 3 per_port;
	}
	option "STD_MODE" "NOECC_12kx4" {
		# only 8k used
		abits 13;
		widths 4 per_port;
	}
	option "STD_MODE" "NOECC_8kx6" {
		abits 13;
		widths 6 per_port;
	}
	option "STD_MODE" "NOECC_6kx8" {
		# only 4k used
		abits 12;
		widths 8 per_port;
	}
	option "STD_MODE" "NOECC_4kx12" {
		abits 12;
		widths 12 per_port;
	}
	option "STD_MODE" "NOECC_2kx24" {
		abits 11;
		widths 24 per_port;
	}
	cost 64;
	init no_undef;
	port srsw "A" "B" {
		clock anyedge;
		clken;
		rdwr no_change;
		rdinit none;
	}
}