ProDAQ 3424 Function Card User Manual
3424-XX-UM
Copyright,
1998-2005 Bustec Production Ltd.
Page 27 of 56
P1
P2
P3
P4
P5
DDS update
ADC reset/settling
DA start
start trig event
stop trig event
Figure 10
– The series of the pulses on SYNC/TRIG signal
The Master is able to send the SYNC/TRIG signal (active low) to any of these outputs:
-
Trigger output, stack A
-
Local synchronization link
-
Front panel FPSYNC_IO line
The clock and SYNC/TRIG signals have to be delivered from the Master to the Slaves. There are
three possible distribution ways shown in the Table 7.
Distribution way
Description
Local
synchronization link
Local synchronization link connects boards sitting on the same
motherboard (up to 3 Slaves connected to the Master). It uses
special connectors and cables going across the function cards.
VXI bus
VXI distribution connects 3424 boards residing on the motherboards
on the VXI bus to the Master. This distribution way is implemented
with the VXI triggers. The SYNC/TRIG and clock signals go to the
trigger outputs on the Master (stack A and B respectively) and then
through the VXI trigger lines they are distributed to all Slaves (trigger
inputs, stack A and B on the Slaves). The clock signal can be
distributed over VXI bus only as a reference clock (not ADC clock)
Front panel
Front panel distribution can be used to connect the Master to the
Slaves sitting on the motherboards in the same VXI chassis or in the
other chassis. The SYNC/TRIG signal can be distributed over front
panel as well a reference clock or ADC clock
Table 7
– Ways of clock and SYNC/TRIG signal distribution
The simplified link scheme of the multiple 3424 boards synchronization is shown on Figure 11.
The synchronisation of the multiple boards requires that settings of the Slaves have to correspond
to the settings of the Master. In addition, the arming of the Slave has to occur before the arming of
the Master. After the end of the Data Acquisition on the Master, the software has to check if all
Slaves finished their Data Acquisition processes.
The Analog Trigger on the Slaves can be used to trigger the Master in the same way as Analog
Trigger on the Master. The Analog Trigger from the Slaves has to be linked to the Input Trigger of
the Master via VXI trigger lines.