National Instruments NI 6225 - Page 364

Appendix B Timing Diagrams
© National Instruments Corporation B-41 M Series User Manual
Setup
To calculate the setup time, subtract the Source delay from the Gate delay.
Use maximum delays.
Hold
To calculate the hold time, subtract the Gate delay from the Source delay.
Use minimum delays.
Gate Delay
PFI to PFI_i 22.0 ns
PFI_i to Selected Gate 6.0 ns
Selected Gate to Count Enable (Level) 18.0 ns
Count Enable Setup Time + 1.5 ns
47.5 ns
Source Delay
PFI to PFI_i 18.2 ns
PFI_i to Selected Source + 21.0 ns
39.2 ns
T
Setup
> 47.5 ns – 39.2 ns = 8.3 ns
Gate Delay
PFI to PFI_i 5.2 ns
PFI_i to Selected Gate 1.0 ns
Selected Gate to Count Enable (Level) 6.0 ns
Count Enable Hold Time + 0.0 ns
12.2 ns
Source Delay
PFI to PFI_i 6.2 ns
PFI_i to Selected Source + 8.0 ns
14.2 ns
T
Hold
> 14.2 ns – 12.2 ns = 2.0 ns