OpenFPGA/yosys/tests/techmap/mem_simple_4x1_cells.v

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module MEM4X1 (CLK, RD_ADDR, RD_DATA, WR_ADDR, WR_DATA, WR_EN);
input CLK, WR_DATA, WR_EN;
input [3:0] RD_ADDR, WR_ADDR;
output reg RD_DATA;
reg [15:0] memory;
always @(posedge CLK) begin
if (WR_EN)
memory[WR_ADDR] <= WR_DATA;
RD_DATA <= memory[RD_ADDR];
end
endmodule