module spram_model #(
   parameter  width = 32
  ,parameter  depth = 256
)(
     clka,
     ena,
     dina,
     addra,
     
     clkb,
     enb,
     doutb,
     addrb
);

//=================================================
function integer clog2(input integer depth);
begin
        for(clog2=0;depth>0;clog2=clog2+1)
                depth =depth>>1;
end
endfunction
//=================================================

localparam aw    = clog2(depth-1);
//=================================================
input              clka;
input              ena;
input  [width-1:0] dina;
input  [aw-1:0]    addra;

input              clkb;
input              enb;
output [width-1:0] doutb;
input  [aw-1:0]    addrb;

   
//================================================
wire               clka;
wire               ena;
wire   [width-1:0] dina;
wire   [aw-1:0]    addra;

wire               clkb;
wire               enb;
reg    [width-1:0] doutb;
wire   [aw-1:0]    addrb;

   
//================================================
reg [width-1:0] mem[0:depth-1];

always@(posedge clka)begin
   if(!ena)begin
      mem[addra] <=dina;
   end
end

always@(posedge clkb)begin
   if(!enb)begin
      doutb <=mem[addrb];
   end
   else begin
        doutb <=0;
   end
end

endmodule