Hi everyone,
I’m Sangeetha, new to CASPER. I’m currently learning how to use the CASPER
toolflow to design simple digital backends, starting with older platforms
such as RedPitaya, SKARAB, and SNAP.
While following the tutorial for a basic LED blinking design, I encountered
a timing-related error during the build. The relevant debug output is shown
below:
[2026-01-09
17:37:17,207][toolflow.py:1927][add_tcl_cmd][DEBUG][MainThread]: Adding tcl
command:
proc check_timing {run} {
if { [get_property STATS.WNS [get_runs $run] ] < 0 } {
send_msg_id "CASPER-1" {CRITICAL WARNING} "ERROR: Found timing violations
=> Worst Negative Slack: [get_property STATS.WNS [get_runs $run]] ns"
} else {
puts "No timing violations => Worst Negative Slack: [get_property STATS.WNS
[get_runs $run]] ns"
}
if { [get_property STATS.TNS [get_runs $run] ] < 0 } {
send_msg_id "CASPER-1" {CRITICAL WARNING} "ERROR: Found timing violations
=> Total Negative Slack: [get_property STATS.TNS [get_runs $run]] ns"
}
if { [get_property STATS.WHS [get_runs $run] ] < 0 } {
send_msg_id "CASPER-1" {CRITICAL WARNING} "ERROR: Found timing violations
=> Worst Hold Slack: [get_property STATS.WHS [get_runs $run]] ns"
} else {
puts "No timing violations => Worst Hold Slack: [get_property STATS.WHS
[get_runs $run]] ns"
}
if { [get_property STATS.THS [get_runs $run] ] < 0 } {
send_msg_id "CASPER-1" {CRITICAL WARNING} "ERROR: Found timing violations
=> Total Hold Slack: [get_property STATS.THS [get_runs $run]] ns"
}
}
Based on my understanding, I checked the platform clock settings and set
the clock frequency to 125 MHz, corresponding to the ADC clock. However,
the timing violation persists.
I would really appreciate any guidance on whether the clock configuration
is correct for this tutorial, or if I’m missing something fundamental in
the setup.
Thanks in advance for your help.
Best regards,
Sangeetha
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