// file: clkmgr_dcm_tb.v
//
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//----------------------------------------------------------------------------
// Clocking wizard demonstration testbench
//----------------------------------------------------------------------------
// This demonstration testbench instantiates the example design for the
// clocking wizard. Input clocks are toggled, which cause the clocking
// network to lock and the counters to increment.
//----------------------------------------------------------------------------
`timescale 1ps/1ps
`define wait_lock @(posedge CLK_VALID)
module clkmgr_dcm_tb ();
// Clock to Q delay of 100ps
localparam TCQ = 100;
// timescale is 1ps/1ps
localparam ONE_NS = 1000;
localparam PHASE_ERR_MARGIN = 100; // 100ps
// how many cycles to run
localparam COUNT_PHASE = 1024;
// we'll be using the period in many locations
localparam time PER1 = 20.0*ONE_NS;
localparam time PER1_1 = PER1/2;
localparam time PER1_2 = PER1 - PER1/2;
// Declare the input clock signals
reg CLK_IN1 = 1;
// The high bit of the sampling counter
wire COUNT;
// Status and control signals
reg RESET = 0;
wire INPUT_CLK_STOPPED;
wire CLK_VALID;
reg COUNTER_RESET = 0;
wire [1:1] CLK_OUT;
//Freq Check using the M & D values setting and actual Frequency generated
// Input clock generation
//------------------------------------
always begin
CLK_IN1 = #PER1_1 ~CLK_IN1;
CLK_IN1 = #PER1_2 ~CLK_IN1;
end
// Test sequence
reg [15*8-1:0] test_phase = "";
initial begin
// Set up any display statements using time to be readable
$timeformat(-12, 2, "ps", 10);
COUNTER_RESET = 0;
test_phase = "reset";
RESET = 1;
#(PER1*6);
RESET = 0;
test_phase = "wait lock";
`wait_lock;
#(PER1*6);
COUNTER_RESET = 1;
#(PER1*20)
COUNTER_RESET = 0;
test_phase = "counting";
#(PER1*COUNT_PHASE);
$display("SIMULATION PASSED");
$display("SYSTEM_CLOCK_COUNTER : %0d\n",$time/PER1);
$finish;
end
// Instantiation of the example design containing the clock
// network and sampling counters
//---------------------------------------------------------
clkmgr_dcm_exdes
#(
.TCQ (TCQ)
) dut
(// Clock in ports
.CLK_IN1 (CLK_IN1),
// Reset for logic in example design
.COUNTER_RESET (COUNTER_RESET),
.CLK_OUT (CLK_OUT),
// High bits of the counters
.COUNT (COUNT),
// Status and control signals
.RESET (RESET),
.INPUT_CLK_STOPPED (INPUT_CLK_STOPPED),
.CLK_VALID (CLK_VALID));
// Freq Check
endmodule
