`ifdef VENDORRAM
// instantiation of a vendor's dual-port RAM
VENDOR_RAM MEM (.dout(rdata), .din(wdata),
.waddr(waddr), .raddr(raddr),
.wclken(wclken), .clk(wclk));
`else
reg [DATASIZE-1:0] MEM [0:DEPTH-1];
  assign rdata = MEM[raddr];
always @(posedge wclk)
if (wclken) MEM[waddr] <= wdata;
`endif 此帖出自小平头技术问答