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Addressing A24
Registers
A16 Memory
Registers
VXI ID Register
b+00
15
14
h
Write
Read
Device Class
VXI Device Type Register
b+02
15
14
h
Write
Read
Required Memory
As shown in Figure 4-4, most of the registers for an M-Module are mapped
into A24 address space. To access one of these registers:
1. Obtain the A24 base address by reading the A24 Offset register (06
in A16 memory.
2. Add the A24 base address to the A24 register offset.
For example, if the A24 base address is 200100
Command/Response Register at address 20
200100
+ 20
h
or (decimal)
2,097,408 + 32 = 2,097,440
When the HP E2261A Quad RS-232 Interface M-Module is used with an HP
E2251 Carrier, the Carrier provides the following registers in A16 VXI
memory:
•
VXI ID Register at address 00
•
VXI Device Type Register at address 02
•
VXI Status Control Register at address 04
•
VXI Offset Register at address 06
For additional information on these registers and a detailed description of
the bit values, refer to the HP E2251 Carrier User's Manual.
The ID Register is a read only register at address 00
The default value of this register for the HP E2261A Quad RS-232 Interface
M-Module is CFFF
13
12
11
10
Addr. Space
The Device Type Register is a read only register at address 02
03
(LSB). The default value of this register for the HP E2261A Quad
h
RS-232 Interface M-Module is F25A
13
12
11
10
= 200120
h
h
h
h
.
h
9
8
7
6
Undefined
Manufacturer ID (4095 decimal for HP M-Modules)
.
h
9
8
7
6
Undefined
M-Module Model Code
Register Programming Information
, to access the
h
:
h
h
h
(MSB) and 01
h
h
5
4
3
2
(MSB) and
h
5
4
3
2
)
h
(LSB).
1
0
1
0
61
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