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A16 Address Space
Inside the Command
Module or Mainframe
ADDRESS MAP
FFFFFF
16
EOOOOO
16
ADDRESS
200000
16
IF0000
16
000000
16
Figure B-2. Registers Within the Command Module A16 Address Space
Register Offset
Appendix B
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When the A16 address space is inside the E1406 Command Module (Figure
B-2), the multiplexer's base address is computed as 1FC000
64)
or 2,080,768 + (LADDR * 64). 1FC000
16
location of the VXI A16 addresses, LADDR is the multiplexer's logical
address, and 64 is the number of address bytes per register-based device.
The multiplexer's factory set logical address is 112 if this address is not
changed, the multiplexer will have a base address of 1FC000
64)
= 1FC000
16
2,080,768 + 1536 = 2,087,936.
E1406
200000
16
IFCOOO
16
A16
A24
ADDRESS
SPACE
SPACE
IFOOOO
16
*
Base Address = IFC000
16
2,080,768 + (Logical Address 64)
Register Address = Base address + Register Offset
The register offset is the register's location in the block of 64 address bytes.
For example, the multiplexer's Status/Control Register has an offset of 04
When you write a command to this register, the offset is added to the base
address to form the register address. For example, DC00
1FDC00
or
16
+ 4 = 2,087,940.
+ 1C00
= 1FDC00
16
16
16
200000
16
REGISTER
ADDRESS
SPACE
*
IFCOOO
16
(2,080,768)
*
+ (Logical Address 64)
16
or
*
10
+ 04
= 1FDC04
or 56,320 + 4 = 56,324 or 2,087,936
16
16
Register-Based Programming 103
+ (LADDR *
16
(2,080,768) is the starting
16
+ (112 *
16
or 2,080,768 + (112 * 64) =
REGISTER
16-BIT WORDS
OFFSET
3E
16
3C
16
28
Tree Relay Control Register
16
26
Bank B Control Register
16
24
Bank B Control Register
16
22
Bank A Control Register
16
20
Bank A Control Register
16
O4
Status/Control Register
16
O2
Device Type Register
16
OO
ID Register
16
E1476
A16 REGISTER MAP
+ 04
= DC04
16
16
.
16
16
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