Design Tools - Others

[joedelong]

What are the requirements for clocking the ILA? For example can I use a low frequency short pulse as a clock? (10kHz 8ns wide pulse)

[austin]

j,

http://www.xilinx.com/support/documentation/sw_manuals/xilinx11/chipscope_pro_sw_cores_11_1_ug029.pd...

One clocks all the logic, and the logic analyzer (Chipscope) from the same clock (generally).

Will everything meet timing and work with your proposed clock?

[joedelong]

In this case the clock signal I want to use for the ILA is the data valid strobe which occurs after the data I want to observe is stable. I have a second ILA looking at the same data but using the system clock to drive the ILA clock. When I trigger the second ILA with the data valid strobe the data is always stable and correct. However when I use the Data valid strobe as a clock to the ILA the data reads back incorrect.

[joedelong]

 generate
 if (DEBUG)
   begin : chipscope  
  
  wire [255:0] TRIG0;
  assign TRIG0[31:0]    = MPMC_data_X;
  assign TRIG0[63:32]   = MPMC_data_Y;
  assign TRIG0[64]    = MPMC_strb;
  assign TRIG0[65]    = StartCalcLocal;
  assign TRIG0[75:66]   = MEM_addr;
  assign TRIG0[107:76]  = CalcData;
  assign TRIG0[115:108]  = state2;
  assign TRIG0[116]   = StartCalc_reg;
  assign TRIG0[117]   = calcDone;
  assign TRIG0[149:118]  = remoteData;
  assign TRIG0[150]       = StartCalcRemote;
  assign TRIG0[255:151]   = 0;

  ila myIla (
    .CONTROL(CONTROL0), // INOUT BUS [35:0]
    .CLK(LocalTimeStampClock), // IN
    .TRIG0(TRIG0) // IN BUS [99:0]
  );    

  wire [255:0] TRIG3;
  assign TRIG3[31:0]    = MPMC_data_X;
  assign TRIG3[63:32]   = MPMC_data_Y;
  assign TRIG3[64]    = MPMC_strb;
  assign TRIG3[65]    = StartCalcLocal;
  assign TRIG3[75:66]   = MEM_addr;
  assign TRIG3[107:76]  = CalcData;
  assign TRIG3[115:108]  = state2;
  assign TRIG3[116]   = StartCalc_reg;
  assign TRIG3[117]   = calcDone;
  assign TRIG3[149:118]  = remoteData;
  assign TRIG3[150]       = StartCalcRemote;
  assign TRIG3[255:151]   = 0;

  ila myIla2 (
    .CONTROL(CONTROL3), // INOUT BUS [35:0]
    .CLK(MPMC_strb), // IN
    .TRIG0(TRIG3) // IN BUS [99:0]
  );    
  
 end
 endgenerate

[rcingham]

"However when I use the Data valid strobe as a clock to the ILA the data reads back incorrect."

Perhaps this is because it is not a clock.
It might work if you passed it through a BUFG/R.
Remember to add a KEEP attribute so that it survives synthesis.