How to wire to signal tap?

[Altera_Forum]

(* keep = 1 *) wire rx_bar_hit/* synthesis keep */; assign rx_bar_hit = (rx_desc | rx_desc) ? 1'b1 : 1'b0; But I can't add this signal to Siganl Tap.  

If I add this signal manualy (just type this name in signal tap):  Critical Warning: Can't connect pre-synthesis signal "top_example_chaining_pipen1b:core|altpcierd_example_app_chaining:app|altpcierd_cdma_app_icm:chaining_dma_arb|artem_dma:artem_dma0|rx_bar_hit" to port "trigger_in" on SignalTap II instance "auto_signaltap_0" because the signal does not exist in the pre-synthesis netlis

[Altera_Forum]

--- Quote Start ---  (* keep = 1 *) wire rx_bar_hit/* synthesis keep */; assign rx_bar_hit = (rx_desc | rx_desc) ? 1'b1 : 1'b0; But I can't add this signal to Siganl Tap.  If I add this signal manualy (just type this name in signal tap):  Critical Warning: Can't connect pre-synthesis signal "top_example_chaining_pipen1b:core|altpcierd_example_app_chaining:app|altpcierd_cdma_app_icm:chaining_dma_arb|artem_dma:artem_dma0|rx_bar_hit" to port "trigger_in" on SignalTap II instance "auto_signaltap_0" because the signal does not exist in the pre-synthesis netlis   --- Quote End ---    Hi,  which setting did you use in the node finder ? Post-Fitting ?? Which Quartus version do you use ?  Kind regards  GPK

[Altera_Forum]

--- Quote Start ---  Hi,  which setting did you use in the node finder ? Post-Fitting ?? Which Quartus version do you use ?  Kind regards  GPK  --- Quote End ---   Hello. I'm try all settings. No one can find rx_bar_hit. Q9.1 Linux 64bit.

[Altera_Forum]

--- Quote Start ---  Hello. I'm try all settings. No one can find rx_bar_hit. Q9.1 Linux 64bit.  --- Quote End ---    Hi,  strange, at least "All Names" should show the signal. Did you try wildcards like rx_bar* ?  Kind regards  GPK

[Altera_Forum]

--- Quote Start ---  Hi,  strange, at least "All Names" should show the signal. Did you try wildcards like rx_bar* ? GPK  --- Quote End ---   Yes,  "Design Entry (all names)" don't show this signal. Even if I make (* noprune *) (* keep = 1 *) wire rx_bar_hit;

[Altera_Forum]

--- Quote Start ---  Yes,  "Design Entry (all names)" don't show this signal. Even if I make (* noprune *) (* keep = 1 *) wire rx_bar_hit;  --- Quote End ---    Hi,  did you get a warning like this : "object "rx_bar_hit" assigned a value but never read" ?  That means the signal "rx_bar_hit" is not used in your design and it looks like that it is removed regardless of your "keep" assignment. I assume "keep" will only work in order to prevent the signal to be removed by the synthesis engine.   BTW: "noprune" works only for reg ! in case they have no fan out.  Kind regards  GPK

[Altera_Forum]

--- Quote Start ---  Hi,  did you get a warning like this : "object "rx_bar_hit" assigned a value but never read" ?  That means the signal "rx_bar_hit" is not used in your design and it looks like that it   --- Quote End ---   Yes. I'm not use this wire yet. But I'm expected that wire will be used by Signal Tap.    --- Quote Start ---   is removed regardless of your "keep" assignment. I assume "keep" will only work in order to prevent the signal to be removed by the synthesis engine.   BTW: "noprune" works only for reg ! in case they have no fan out.  --- Quote End ---   So, there are no way to make wire only for Signal Tap?

[Altera_Forum]

--- Quote Start ---  Yes. I'm not use this wire yet. But I'm expected that wire will be used by Signal Tap.   So, there are no way to make wire only for Signal Tap?  --- Quote End ---     Hi,  it looks like that, but you can try to capture the wire signal with a register and preserve the register with "noprune".   Kind regards  GPK

[Altera_Forum]

--- Quote Start ---  Hi,  it looks like that, but you can try to capture the wire signal with a register and preserve the register with "noprune".   Kind regards  GPK  --- Quote End ---    Hi,  I looked into the Quartus Help and found this restriction for "keep":  "You cannot use this synthesis attribute for nodes that have no fan-out."

[Altera_Forum]

--- Quote Start ---  Hi,  it looks like that, but you can try to capture the wire signal with a register and preserve the register with "noprune".   Kind regards  GPK  --- Quote End ---     --- Quote Start ---   (* keep = 1 *) wire rx_bar_hit;  (* noprune *)reg rx_bar_hit_reg;   always @ (posedge clk_in) begin  rx_bar_hit_reg <= rx_bar_hit;  end   --- Quote End ---   Worked.   Thanks for all.

[Altera_Forum]

you can also route those signals to outside pins, to leds for instance. 

 a colegue of mine suggested me to XOR all signals that i want to debug and route result to LEDs.