tri fpga-rxcap

Per-bit setup and hold of an asynchronous RX nibble sampled by RXC, from the routed SDF: the four rxd bits of one nibble change 2387 to 2486 ps apart, so a binary counter tears where a gray one cannot.

tri fpga-rxcap

rxd_n[0]   mid-nibble: C   3680.0  D   1194.0  Delta   2486.0  Tsu  100.0 Th  100.0 ps; setup  17886.0 >
= 1000; hold  10914.0 >= 1000                                                                           
rxd_n[1]   mid-nibble: C   3680.0  D   1247.0  Delta   2433.0  Tsu  100.0 Th  100.0 ps; setup  17833.0 >
= 1000; hold  10967.0 >= 1000                                                                           
rxd_n[2]   mid-nibble: C   3680.0  D   1290.0  Delta   2390.0  Tsu  100.0 Th  100.0 ps; setup  17790.0 >
= 1000; hold  11010.0 >= 1000                                                                           
rxd_n[3]   mid-nibble: C   3680.0  D   1293.0  Delta   2387.0  Tsu  100.0 Th  100.0 ps; setup  17787.0 >
= 1000; hold  11013.0 >= 1000                                                                           
rxctl_n    mid-nibble: C   3680.0  D   1180.0  Delta   2500.0  Tsu  100.0 Th  100.0 ps; setup  17900.0 >
= 1000; hold  10900.0 >= 1000                                                                           
rxd_p1[0]  at the rising edge: C   3680.0  D   1246.0  Delta   2434.0 ps; new for x <= 2334.0, old for x
 >= 2534.0; over the range new, at nominal new                                                          
rxd_p1[1]  at the rising edge: C   3680.0  D   1209.0  Delta   2471.0 ps; new for x <= 2371.0, old for x
 >= 2571.0; over the range new, at nominal new                                                          
rxd_p1[2]  at the rising edge: C   3680.0  D   1394.0  Delta   2286.0 ps; new for x <= 2186.0, old for x
 >= 2386.0; over the range new, at nominal new                                                          
rxd_p1[3]  at the rising edge: C   3680.0  D   1393.0  Delta   2287.0 ps; new for x <= 2187.0, old for x
 >= 2387.0; over the range new, at nominal new                                                          
rxctl_n    at the rising edge: C   3680.0  D   1180.0  Delta   2500.0 ps; new for x <= 2400.0, old for x
 >= 2600.0; over the range new, at nominal new                                                          
rxctl_n    at an RX_ER nibble's falling-edge change: new for x <= 2400.0, old for x >= 2600.0; over the 
range new, at nominal new                                                                               
guess (information only): verdict PASS; ed over the range undetermined, at nominal new; RX_ER over the r
ange undetermined, at nominal new                                                                       
model (information only): ed over the range new, at nominal new; RX_ER over the range new, at nominal ne
w                                                                                                       
smallest mid-nibble margin 10900.0 ps on rxctl_n                                                        
end: load average 9.93 6.25 7.33 on 8 cpus                                                              
VERDICT: PASS                                                                                           
tmp $

recorded 2026-10-07 20:12 UTCreal 2.4 sshown 2.4 sexit codes 0

$ tri fpga-rxcap

Staged: the prompt and the typing. Real: every byte the commands printed, at the time they printed it. Any silence longer than 2 s is shown for 2 s, and the title bar says so while it happens. Edited: home directory shown as ~.

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