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Chapter 1
Getting Started
PXI Local Bus
The PXI backplane local bus is a daisy-chained bus that connects each peripheral slot with
adjacent peripheral slots to the left and right, as shown in Figure 1-4.
The backplane routes the full 13-line PXI Local Bus between adjacent PXI slots (slots 2 to 6 and
15 to 18) and PXI Local Bus 6 between all other slots. Refer to Figure 1-4 for details. The left
local bus 6 from slot 1 is not routed anywhere and the right local bus signals from slot 18 are not
routed anywhere.
Local bus signals may range from high-speed TTL signals to analog signals as high as 42 V.
Initialization software uses the configuration information specific to each adjacent peripheral
module to evaluate local bus compatibility.
Figure 1-4.
PXI Trigger Bus and Local Bus Connectivity Diagram
P2
P1
XP4
XP
3
TP2
TP1
P2
P1
P2
P1
P2
P1
P1
P1
P1
XP4
XP
3
XP4
XP
3
XP4
XP
3
XP4
XP
3
XP4
XP
3
XP4
XP
3
XP4
XP
3
P2
P1
P2
P1
P2
P1
P2
P1
P2
P1
P1
XP4
XP
3
XP2
XP1
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB6
PXI_LB (12:0)
PXI_LB (12:0)
PXI_LB (12:0)
PXI_LB (12:0)
PXI_LB (12:0)
PXI_LB (12:0)
PXI_LB (12:0)
PXI
Trigger B
us
B
u
ffer Bridge
PXI
Trigger B
us
B
u
ffer Bridge
PXI Trigger B
us
S
egment 1
PXI Trigger B
us
S
egment 2
PXI Trigger B
us
S
egment
3
1
8
9
10
7
H
11
H
H
12
H
1
3
14
15
6
5
4
3
2
16
17
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