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The VXI Bus Registers are defined as follows:
q Id Register: A read of this 16 bit register provides information about the device’s
configuration. Its value is always CFFF16 as defined in the following table.
Bit 15-14 13-12 11-0
Contents
11
(Register Based Device)
00
(A16/A24)
111111111111
(HP’s ID)
q Logical Address Register: A write to this register changes the device’s logical
address according to the VXI Bus Dynamic Configuration protocol. Its format is
defined in the following table.
Bit 15-8 7-0
Contents No effect
Logical
Address
q Device Type Register: A read of this register provides information about the
device’s configuration. Its format is defined in the following table.
Bit 15-12 11-0
Contents
0011
(1MB of A24)
Model Code
(202
for HP E1433A)
q Status Register: A read of this register provides information about the device’s
status as defined in the following table.
Bit 15 14 13-12 11 10 9 8
Contents
A24
Active
MODID* Unused
Block
Ready
Data
Ready
ST
Done
Loaded
Bit76543210
Contents Done Err* Unused
HW
OK
Ready Passed
Q Resp
Ready
Cmd
Ready
A24 Active: A one (1) in this field indicates that the A24 registers can be
accessed. It reflects the state of the Control register’s A24 Enable bit.
MODID*: A one (1) in this field indicates that the device is not selected
via the P2 MODID line. A zero (0) indicates that the device is selected by
a high state on the P2 MODID line.
Unused: A read of these bits will always return zero (0).
Block Ready: A one (1) indicates that there is a block of data available to
be read from the Send Data registers. A zero (0) indicates that less than a
full block is available.
HP E1433A User's Guide
Register Definitions
A-5