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[verilog]RAM example
# 38 JMJS    09.6.5 16:59

`timescale 1 ns / 100 ps
module jmjsram8x16 (clk, cs, we, addr, din, dout);
input                clk, cs, we;
input        [3:0]        addr;
input        [7:0]        din;
output        [7:0]        dout;
jmjsram #(8,16,4) u0 (clk, cs, we, addr, din, dout);
endmodule

module jmjsram (clk, cs, we, addr, din, dout);
parameter WIDTH=2, DEPTH=2, ADDR_WIDTH=2;

input                                clk, cs, we;
input        [ADDR_WIDTH -1:0]        addr;
input        [WIDTH -1:0]                din;
output        [WIDTH -1:0]                dout;

reg        [WIDTH -1:0]                mem        [0:DEPTH -1];
reg        [ADDR_WIDTH -1:0]        addr_r;
reg                                cs_r;
always @(posedge clk) begin
        if(we) mem[addr] <= din;
        addr_r        <= addr;
        cs_r        <= cs;
end

assign dout = (cs_r)? mem[addr_r] : {WIDTH{1'bz}};

endmodule

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