?? ref_timer.v
字號(hào):
/********************************************************* MODULE: Sub Level Refresh Timer FILE NAME: ref_timer.v VERSION: 1.0 DATE: April 28th, 2002 AUTHOR: Hossein Amidi COMPANY: CODE TYPE: Register Transfer Level DESCRIPTION: This module is the sub level RTL code of SDRAM Controller ASIC verilog code. It will generate the internal refresh counter. Hossein Amidi (C) April 2002*********************************************************/// DEFINES`timescale 1ns / 10psmodule ref_timer(// Input reset, clk0, refresh_count, bur_len, ref_ack, // Output ref_req );// Parameter`include "parameter.v"// Inputinput reset;input clk0;input [15:0]refresh_count;input [burst_size - 1 : 0]bur_len;input ref_ack;// Outputoutput ref_req;// Internal wire and reg signalsreg ref_req;reg [15:0]refresh_timer; // 16-bit refresh counter Max. 65536reg rftimer_zero;// Assignment// Refresh Timeralways @(posedge reset or posedge clk0)begin if(reset == 1'b1) begin refresh_timer <= 16'h0000; rftimer_zero <= 1'b0; ref_req <= 1'b0; end else begin if(rftimer_zero == 1'b1) refresh_timer <= refresh_count; else if(bur_len != 3'b000) refresh_timer <= refresh_timer - 1'b1; if((refresh_timer == 0) & (bur_len != 3'b000)) begin rftimer_zero <= 1'b1; ref_req <= 1'b1; end else if(ref_ack == 1'b1) begin rftimer_zero <= 1'b0; ref_req <= 1'b0; end endendendmodule
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