Forum Discussion

amildm's avatar
amildm
Icon for Contributor rankContributor
4 years ago
Solved

[SignalTap] How to add signals defined as "wire" in RTL?

Hi All, How can I add signals, which are defined as "wire" in RTL, to SignalTap ? Thank you!
  • sstrell's avatar
    sstrell
    4 years ago

    Well, there's your problem. It's getting optimized away. Tap the "upstream" signals that drive this or add virtual pin assignments to the signal in the Assignment Editor.

sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
4 years ago

Any signal you can find in the Signal Tap Node Finder filter is tappable. It doesn't matter how it's defined in the RTL. If you are concerned about RTL signals getting optimized away, use the Signal Tap pre-synthesis filter in the Node Finder. That lets you select signals directly defined in your RTL.

  • amildm's avatar
    amildm
    Icon for Contributor rankContributor
    4 years ago

    I'd like to add the pix_data_in_422 signal, to the SignalTap (signal definition please see below).

    logic [PIX_DATA_BW-1:0] pix_data_in_422;
always_comb begin : pix_data_in_422_l
     pix_data_in_422 = {//[95:48]
                        pix_data_in[47+48:40+48],pix_data_in[15+48:12+48],4'd0,   // [47:32] Cr/Cb
                        pix_data_in[31+48:24+48],pix_data_in[11+48: 8+48],4'd0,   // [31:16] Y
                        16'd0,                                         // [15:0]
                        //[47:0]
                        pix_data_in[47:40],pix_data_in[15:12],4'd0,   // [47:32] Cr/Cb
                        pix_data_in[31:24],pix_data_in [11:8],4'd0,   // [31:16] Y
                        16'd0                                         // [15:0]
};
end

    Here is the filter I applied in SignalTap: