demo: provide calibration clock

parent edce0bce
...@@ -32,8 +32,7 @@ module system( ...@@ -32,8 +32,7 @@ module system(
output [3:0] led, output [3:0] led,
// TDC // TDC
input [1:0] tdc_signal, input [1:0] tdc_signal
input [1:0] tdc_calib
); );
//------------------------------------------------------------------ //------------------------------------------------------------------
...@@ -456,6 +455,8 @@ sysctl #( ...@@ -456,6 +455,8 @@ sysctl #(
//--------------------------------------------------------------------------- //---------------------------------------------------------------------------
// TDC // TDC
//--------------------------------------------------------------------------- //---------------------------------------------------------------------------
wire [1:0] tdc_calib;
tdc_hostif #( tdc_hostif #(
.g_CHANNEL_COUNT(2), .g_CHANNEL_COUNT(2),
.g_CARRY4_COUNT(100), .g_CARRY4_COUNT(100),
...@@ -485,4 +486,19 @@ tdc_hostif #( ...@@ -485,4 +486,19 @@ tdc_hostif #(
.calib_i(tdc_calib) .calib_i(tdc_calib)
); );
// startup calibration oscillator
wire cal_clk16x;
wire cal_clk;
tdc_ringosc #(
.g_LENGTH(31)
) calib_osc (
.en_i(~sys_rst),
.clk_o(cal_clk16x)
);
reg [3:0] cal_clkdiv;
always @(posedge cal_clk16x) cal_clkdiv <= cal_clkdiv + 4'd1;
assign cal_clk = cal_clkdiv[3];
assign tdc_calib = {2{cal_clk}};
endmodule endmodule
...@@ -26,8 +26,6 @@ NET "led[3]" LOC = C20 | IOSTANDARD = "LVCMOS18"; ...@@ -26,8 +26,6 @@ NET "led[3]" LOC = C20 | IOSTANDARD = "LVCMOS18";
# FIXME # FIXME
NET "tdc_signal[0]" LOC = AB11 | IOSTANDARD = LVCMOS25 | PULLDOWN; NET "tdc_signal[0]" LOC = AB11 | IOSTANDARD = LVCMOS25 | PULLDOWN;
NET "tdc_signal[1]" LOC = Y11 | IOSTANDARD = LVCMOS25 | PULLDOWN; NET "tdc_signal[1]" LOC = Y11 | IOSTANDARD = LVCMOS25 | PULLDOWN;
NET "tdc_calib[0]" LOC = AB12 | IOSTANDARD = LVCMOS25 | PULLDOWN;
NET "tdc_calib[1]" LOC = AA12 | IOSTANDARD = LVCMOS25 | PULLDOWN;
# ==== TDC core ==== # ==== TDC core ====
NET "tdc/cmp_tdc/cmp_channelbank/g_channels[0].cmp_channel/muxed_signal" TIG; NET "tdc/cmp_tdc/cmp_channelbank/g_channels[0].cmp_channel/muxed_signal" TIG;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment