Chapter 4
Arb Operation
©
National Instruments Corporation
4-27
DAQArb 5411 User Manual
The sample clock for integral subdivisions of 40 MHz will always have
a high pulse width of 25 ns. If the t
co
time is insufficient for the hold
time of your device, then you can use the falling edge of the sample
clock output (PCLK) to register the digital pattern data.
RTSI Trigger Lines
The DAQArb 5411 contains seven trigger lines and one RTSI clock line
available over the RTSI bus to send and receive DAQArb 5411-specific
information to other boards having RTSI connectors. Figure 4-25 shows
the RTSI trigger lines and routing of DAQArb 5411 signals to the RTSI
switch.
Figure 4-25.
DAQArb 5411 RTSI Trigger Lines and Routing
For phase locking to other boards as a master, the 5411 sends an
onboard 20 MHz signal to the RTSI Osc line as a Board Clock signal.
For locking to other devices as a slave, the DAQArb 5411 receives the
RTSI Osc line as a RTSI Clock signal.
The DAQArb 5411 can receive a hardware trigger from another board
as a RTSI trigger signal on any of the RTSI trigger lines, RTSI <0.. 6>.
The marker generated during waveform generation in Arb mode can be
routed to any of the RTSI bus trigger lines.
The trigger generated on the DAQArb 5411 can be routed to other
boards through any of the RTSI bus trigger lines.
RTSI
Switch
RTSI Bus
RTSI 0
RTSI 1
RTSI 2
RTSI 3
RTSI 4
RTSI 5
RTSI 6
RTSI Osc
Marker
Start Trigger
SYNC
RTSI Trigger
Board Clock
RTSI Clock
Master/Slave
