ADLINK Technology USB-1901, User Manual

Page: 64 / 84

50 Operation
Waveform Generation with Internal Hardware Timer
Six counters interact with the waveform, generating different
DAWR timings to produce various waveforms, as shown.
*timebase= 80 MHz
Table 4-3: Waveform Generation Timer Definition
Counter Width Description Note
UI_counter 32-bit
Update interval,
defining the update
interval between each
data output.
Update interval =
UI_counter / timebase
*
UC_counter 32-bit
Update count, defining
the amount of data in a
waveform.
When value in
UC_counter is less
than the size of
waveform patterns, the
waveform is generated
incrementally.
IC_counter 32-bit
Iteration calculation,
defining how many
times the waveform is
generated.
DLY1_counter 32-bit
Defines the delay time
for waveform
generation after the
trigger signal.
Delay Time =
(DLY1_counter / Clock
timebase)
DLY2_counter 32-bit
Defines the delay time
to separate consecutive
waveform generation.
Effective only in
Iterative Waveform
Generation mode.
Delay Time =
(DLY2_counter / Clock
timebase)
Trig_counter 32-bit
Defines the acceptable
start trigger count when
re-trigger function is
enabled