FreeCalypso > hg > fc-sim-sniff

annotate fpga/sniffer-pps/clk_check.v @ 58:95ed46b5f8f1 default tip

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doc/Sniffing-hw-setup: mv-sniffer is here
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 04 Oct 2023 05:55:09 +0000
parents 737579209153
children
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737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
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2 * The logic implemented in this module detects if SIM_CLK is running or not,
737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
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3 * for the purpose of visual indication on a LED.
737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
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4 */
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6 module clk_check (IntClk, SIM_CLK_sync, SIM_CLK_running);
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7
737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
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8 input IntClk;
737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
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9 input SIM_CLK_sync;
737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
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10 output SIM_CLK_running;
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12 reg [11:0] shift_reg;
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737579209153 fpga/sniffer-pps: add LED indication of running SIM CLK
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14 always @(posedge IntClk)
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15 shift_reg <= {shift_reg[10:0],SIM_CLK_sync};
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16
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17 assign SIM_CLK_running = (shift_reg != 12'h000) && (shift_reg != 12'hFFF);
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18
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19 endmodule