Required VXI Registers
The required VXI registers include ID, Device Type, VXI Status, and
VXI Control Registers.
ID Register
Base + 00
16
Read only, returns 4FFF
16
: The module’s ID Register indicates the
classification, addressing mode, and the manufacturer of the device.
Address
15
14
13
12
11 - 0
Base + 00
16
Device Class
Address Mode
Manufacturer ID
Device Classification: Bits 15 and 14 classify a device as one of the
following:
0 0 Memory device
0 1 Extended device
1 0 Message-based device
1 1 Register-based device
The HP E1313/E1413 is an extended device.
Addressing Mode: Bits 13 and 12 indicate the addressing mode used by the
device:
0 0 A16/A24 address mode
0 1 A16/A32 address mode
1 0 RESERVED
1 1 A16 address mode
The HP E1313/E1413 uses the A16/A24 address mode.
Manufacturer ID: Bits 11 through 0 identify the manufacturer of the device.
Hewlett-Packard’s ID number is 4095, which corresponds to bits 11 - 0 being
set to “ 1".
338 Register-Based Programming
Appendix D
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