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Diffstat (limited to 'fpga/usrp2/models/IDDR2.v')
| -rw-r--r-- | fpga/usrp2/models/IDDR2.v | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/fpga/usrp2/models/IDDR2.v b/fpga/usrp2/models/IDDR2.v new file mode 100644 index 000000000..727f1c568 --- /dev/null +++ b/fpga/usrp2/models/IDDR2.v @@ -0,0 +1,172 @@ +// $Header: /devl/xcs/repo/env/Databases/CAEInterfaces/verunilibs/data/spartan4/IDDR2.v,v 1.1 2004/06/21 21:45:36 wloo Exp $ +/////////////////////////////////////////////////////////////////////////////// +// Copyright (c) 1995/2004 Xilinx, Inc. +// All Right Reserved. +/////////////////////////////////////////////////////////////////////////////// +// ____ ____ +// / /\/ / +// /___/ \ / Vendor : Xilinx +// \ \ \/ Version : 10.1 +// \ \ Description : Xilinx Functional Simulation Library Component +// / / Dual Data Rate Input D Flip-Flop +// /___/ /\ Filename : IDDR2.v +// \ \ / \ Timestamp : Thu Mar 25 16:43:51 PST 2004 +// \___\/\___\ +// +// Revision: +// 03/23/04 - Initial version. + +`timescale 1 ps / 1 ps + +module IDDR2 (Q0, Q1, C0, C1, CE, D, R, S); + + output Q0; + output Q1; + + input C0; + input C1; + input CE; + input D; + tri0 GSR = glbl.GSR; + input R; + input S; + + parameter DDR_ALIGNMENT = "NONE"; + parameter INIT_Q0 = 1'b0; + parameter INIT_Q1 = 1'b0; + parameter SRTYPE = "SYNC"; + + reg q0_out, q1_out; + reg q0_out_int, q1_out_int; + reg q0_c1_out_int, q1_c0_out_int; + + buf buf_q0 (Q0, q0_out); + buf buf_q1 (Q1, q1_out); + + + initial begin + + if ((INIT_Q0 != 1'b0) && (INIT_Q0 != 1'b1)) begin + $display("Attribute Syntax Error : The attribute INIT_Q0 on IDDR2 instance %m is set to %d. Legal values for this attribute are 0 or 1.", INIT_Q0); + $finish; + end + + if ((INIT_Q1 != 1'b0) && (INIT_Q1 != 1'b1)) begin + $display("Attribute Syntax Error : The attribute INIT_Q0 on IDDR2 instance %m is set to %d. Legal values for this attribute are 0 or 1.", INIT_Q1); + $finish; + end + + if ((DDR_ALIGNMENT != "C1") && (DDR_ALIGNMENT != "C0") && (DDR_ALIGNMENT != "NONE")) begin + $display("Attribute Syntax Error : The attribute DDR_ALIGNMENT on IDDR2 instance %m is set to %s. Legal values for this attribute are C0, C1 or NONE.", DDR_ALIGNMENT); + $finish; + end + + if ((SRTYPE != "ASYNC") && (SRTYPE != "SYNC")) begin + $display("Attribute Syntax Error : The attribute SRTYPE on IDDR2 instance %m is set to %s. Legal values for this attribute are ASYNC or SYNC.", SRTYPE); + $finish; + end + + end // initial begin + + + always @(GSR or R or S) begin + + if (GSR == 1) begin + + assign q0_out_int = INIT_Q0; + assign q1_out_int = INIT_Q1; + assign q0_c1_out_int = INIT_Q0; + assign q1_c0_out_int = INIT_Q1; + + end + else begin + + deassign q0_out_int; + deassign q1_out_int; + deassign q0_c1_out_int; + deassign q1_c0_out_int; + + if (SRTYPE == "ASYNC") begin + if (R == 1) begin + assign q0_out_int = 0; + assign q1_out_int = 0; + assign q0_c1_out_int = 0; + assign q1_c0_out_int = 0; + end + else if (R == 0 && S == 1) begin + assign q0_out_int = 1; + assign q1_out_int = 1; + assign q0_c1_out_int = 1; + assign q1_c0_out_int = 1; + end + end // if (SRTYPE == "ASYNC") + + end // if (GSR == 1'b0) + + end // always @ (GSR or R or S) + + + always @(posedge C0) begin + if (R == 1 && SRTYPE == "SYNC") begin + q0_out_int <= 0; + q1_c0_out_int <= 0; + end + else if (R == 0 && S == 1 && SRTYPE == "SYNC") begin + q0_out_int <= 1; + q1_c0_out_int <= 1; + end + else if (CE == 1 && R == 0 && S == 0) begin + q0_out_int <= D; + q1_c0_out_int <= q1_out_int; + end + end // always @ (posedge C0) + + + always @(posedge C1) begin + if (R == 1 && SRTYPE == "SYNC") begin + q1_out_int <= 0; + q0_c1_out_int <= 0; + end + else if (R == 0 && S == 1 && SRTYPE == "SYNC") begin + q1_out_int <= 1; + q0_c1_out_int <= 1; + end + else if (CE == 1 && R == 0 && S == 0) begin + q1_out_int <= D; + q0_c1_out_int <= q0_out_int; + end + end // always @ (posedge C1) + + + always @(q0_out_int or q1_out_int or q1_c0_out_int or q0_c1_out_int) begin + + case (DDR_ALIGNMENT) + "NONE" : begin + q0_out <= q0_out_int; + q1_out <= q1_out_int; + end + "C0" : begin + q0_out <= q0_out_int; + q1_out <= q1_c0_out_int; + end + "C1" : begin + q0_out <= q0_c1_out_int; + q1_out <= q1_out_int; + end + endcase // case(DDR_ALIGNMENT) + + end // always @ (q0_out_int or q1_out_int or q1_c0_out_int or q0_c1_out_int) + + + specify + + if (C0) (C0 => Q0) = (100, 100); + if (C0) (C0 => Q1) = (100, 100); + if (C1) (C1 => Q1) = (100, 100); + if (C1) (C1 => Q0) = (100, 100); + specparam PATHPULSE$ = 0; + + endspecify + +endmodule // IDDR2 + |