/******************************************************************************* * Module: odelay_fine_pipe * Date:2014-04-25 * Author: Andrey Filippov * Description: ODELAYE2_FINEDELAY wrapper with fine control pipelined * * Copyright (c) 2014 Elphel, Inc. * idelay_fine_pipe.v is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * odelay_fine_pipe.v is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/> . *******************************************************************************/ `timescale 1ns/1ps module odelay_fine_pipe //SuppressWarnings VEditor - IODELAY_GRP used in (* *) construnt # ( parameter IODELAY_GRP = "IODELAY_MEMORY", parameter [7:0] DELAY_VALUE = 0, parameter real REFCLK_FREQUENCY = 200.0, parameter HIGH_PERFORMANCE_MODE = "FALSE" ) ( input clk, input rst, input set, input ld, input [7:0] delay, input data_in, output data_out ); reg [2:0] fdly_pre=DELAY_VALUE[2:0], fdly=DELAY_VALUE[2:0]; always @ (posedge clk or posedge rst) begin if (rst) fdly_pre <= DELAY_VALUE[2:0]; else if (ld) fdly_pre <= delay[2:0]; if (rst) fdly <= DELAY_VALUE[2:0]; else if (set) fdly <= fdly_pre; end `ifdef IVERILOG always @ (fdly_pre) begin if (fdly_pre > 3'h4) $display ("ERROR: fine odelay value should be <5, specified %d @ %t", fdly_pre,$time); end `endif `ifndef IGNORE_ATTR (* IODELAY_GROUP = IODELAY_GRP *) `endif ODELAYE2_FINEDELAY #( .CINVCTRL_SEL("FALSE"), .DELAY_SRC("ODATAIN"), .FINEDELAY("ADD_DLY"), .HIGH_PERFORMANCE_MODE(HIGH_PERFORMANCE_MODE), .ODELAY_TYPE("VAR_LOAD_PIPE"), .ODELAY_VALUE(DELAY_VALUE>>3), // .IS_C_INVERTED(1'b0), // ISE does not have this parameter // .IS_ODATAIN_INVERTED(1'b0), // ISE does not have this parameter .PIPE_SEL("TRUE"), .REFCLK_FREQUENCY(REFCLK_FREQUENCY), .SIGNAL_PATTERN("DATA") ) odelay2_finedelay_i( .CNTVALUEOUT(), .DATAOUT(data_out), .C(clk), .CE(1'b0), .CINVCTRL(1'b0), .CNTVALUEIN(delay[7:3]), .CLKIN(1'b0), .ODATAIN(data_in), .OFDLY(fdly), .INC(1'b0), .LD(set), .LDPIPEEN(ld), .REGRST(rst) ); endmodule