Geographic Address Register - GE SBC330 3U VPX Hardware Reference Manual

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6.6 Geographic Address Register

Publication No. SBC330-0HH/3

The VPX specification defines a total of six backplane pins for Geographical

addressing. There are six Geographic Addressing signals in the VPX specification.

The SBC330 pulls all the Geographic address lines high; the backplane either ties

them low or lets them float according to the slot number, so each slot has a

specific address. The GAP signal is a parity signal, which dictates that the number

of pins tied to ground is odd. Software can check that the global address is valid.

'0' is the 'active' level. Hence from the VPX specification:

Table 6-2

Slot

GA[01234] GAP

Slot 1

01111 1

Slot 2

10111 1

Slot 3

00111 0

Chip Select

CS2

Offset

0x001C

LAD Bit

Reg Bit

R/W

Description

GLOB_A(0)

GLOB_A(1)

GLOB_A(2)

GLOB_A(3)

GLOB_A(4)

GLOB_AP

Reset Value

Slot dependent

FPGA Registers 55

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