You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.3 KiB
61 lines
1.3 KiB
`timescale 1ns / 1ps
|
|
//////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// (c) 2014 Timothy Pearson, Raptor Engineering
|
|
// Released into the Public Domain
|
|
//
|
|
//////////////////////////////////////////////////////////////////////////////////
|
|
|
|
module lcd_data_storage(
|
|
input clka,
|
|
input clkb,
|
|
input [7:0] dina,
|
|
input [7:0] dinb,
|
|
input [4:0] addra,
|
|
input [4:0] addrb,
|
|
input wea,
|
|
input web,
|
|
output reg [7:0] douta,
|
|
output reg [7:0] doutb);
|
|
|
|
parameter RAM_WIDTH = 8;
|
|
|
|
// Xilinx specific directive
|
|
(* RAM_STYLE="BLOCK" *)
|
|
|
|
reg [RAM_WIDTH-1:0] lcd_data_storage_ram [(2**5)-1:0];
|
|
|
|
// Registered
|
|
always @(posedge clka) begin
|
|
douta <= lcd_data_storage_ram[addra];
|
|
if (wea) begin
|
|
lcd_data_storage_ram[addra] <= dina;
|
|
douta <= dina;
|
|
end
|
|
end
|
|
|
|
always @(posedge clkb) begin
|
|
doutb <= lcd_data_storage_ram[addrb];
|
|
if (web) begin
|
|
lcd_data_storage_ram[addrb] <= dinb;
|
|
doutb <= dinb;
|
|
end
|
|
end
|
|
|
|
// // Unregistered
|
|
// always @(posedge clka) begin
|
|
// if (wea) begin
|
|
// lcd_data_storage_ram[addra] <= dina;
|
|
// end
|
|
// end
|
|
// assign douta = lcd_data_storage_ram[addra];
|
|
//
|
|
// always @(posedge clkb) begin
|
|
// if (web) begin
|
|
// lcd_data_storage_ram[addrb] <= dinb;
|
|
// end
|
|
// end
|
|
// assign doutb = lcd_data_storage_ram[addrb];
|
|
|
|
endmodule
|