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Chapter 5
Programming
©
National Instruments Corporation
5-17
c.
Write
00000001 00000011
to the FIFO Register. This
corresponds to Slot 3 for four samples.
Make sure to toggle SLOT0SEL* or reselect the FIFO Register from
scratch between steps 6a, 6b, and 6c.
7.
Follow the procedure given in the
4. Acquisition Enable, Triggering,
section earlier in this chapter.
Example 3
You want to scan four channels on an SCXI-1121 in Slot 4 of Chassis 1,
then two channels of an SCXI-1121 in Slot 11 of Chassis 2, one channel of
an SCXI-1121 in Slot 3 in Chassis 3, and three channels of an SCXI-1121
in Slot 8 of Chassis 3.
Assuming that the modules are cabled and programmed correctly, the
Slot 0 scan lists should be as follows:
Other solutions are possible.
In the
3. Programming the Slot 0 Hardscan Circuitry
section earlier in this
chapter, step 3,
Write the Slot 0 scan list to the FIFO
, consists of the
following steps:
1.
Select Slot 14 in Chassis 1.
2.
Write
XXXXX001 10000011
over MOSI.
3.
Toggle SLOT0SEL*.
4.
Write
XXXXX110 00000101
over MOSI.
5.
Select Slot 14 in Chassis 2.
6.
Write
XXXXX110 00000011
over MOSI.
7.
Toggle SLOT0SEL*.
8.
Write
XXXXX101 00000001
over MOSI.
9.
Toggle SLOT0SEL*.
Chassis 1
Chassis 2
Chassis 3
Entry
Slot
Number
Count
Entry
Slot
Number
Count
Entry
Slot
Number
Count
1
4
4
1
13
4
1
13
6
2
13
6
2
11
2
2
3
1
—
—
—
3
13
4
3
8
3