Timer/Counter Mode Uni
-
and Bi
-
directional Count
Counter mode is typically used for tracking movement of device under test. When possible use the quadrature modes as these are less sensitive
to counting errors.
Signal
∆w
∆w
∆s ∆h
∆s ∆h
Reset
Direction
Figure A.271:
Uni
-
and Bi
-
directional count timing
Inputs
3 pins: signal, reset and direction (only used in bi
-
directional count)
Maximum input frequency
5 MHz
Minimum pulse width (Δw)
100 ns
Counter range
0 to 2
31
; uni
-
directional count
-
2
31
to +2
31
-
1; bi
-
directional count
Gate measuring time
Sample period (1 / sample rate) to 50 s
Can be selected by user to control update rate independent of sample rate
Reset input
Level sensitivity
User selectable invert level
Minimum setup time prior to signal edge (Δs)
100 ns
Minimum hold time after signal edge (Δh)
100 ns
Reset options
Manual
Upon user request by software command
Start recording
Count value set to 0 at Start of recording
First reset pulse
After the recording is started, the first reset pulse sets the counter value to 0. The next reset
pulses are ignored.
Each reset pulse
On each external reset pulse, the counter value is reset to 0.
Direction input
Input Level sensitivity
Only used when in bi
-
directional count
Low: increment counter
High: decrement counter
Minimum setup time prior to signal edge (Δs)
100 ns
Minimum hold time after signal edge (Δh)
100 ns
GEN3i
I3763-3.1 en HBM: public
691
