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Register-Based Programming 89Appendix B
Register Offset The register offset is the register’s location in the block of 64 address bytes.
For example, the switch’s Status/Control Register has an offset of 04
16
.
When you write a command to this register, the offset is added to the base
address to form the register address:
DE00
16
+ 04
16
= DE04
16
1FDE00
16
+ 04
16
= 1FDE04
16
or
56,832 + 4 = 56,836
2,088,448 + 4 = 2,088,452
Figure B-1. Registers within A16 Address Space
Figure B-2. Registers within the E1406 A16 Address Space
Register Address = Base address + Register Offset
Base Address = COOO
OOOO
16
*
SPACE
ADDRESS
COOO
16
FFFF
16
A16
(49,152)
C000
SPACE
ADDRESS
REGISTER
16
*
16
FFFF
ID Register
A16 REGISTER MAP
E1442A
or
49,152 + (Logical Address 64)
+ (Logical Address 64)
16
*
10
*
16
16-BIT WORDS
Status/Control Register
Device Type Register
CH 0-15 Control Register
CH 16-31 Control Register
CH 32-47 Control Register
CH 48-63 Control Register
3C
3E
14
REGISTER
OFFSET
O4
O2
OO
16
16
16
16
16
16
10
12
16
16
16
16
+ (Logical Address 64)
2,080,768 + (Logical Address 64)
Register Address = Base address + Register Offset
200000
IF0000
000000
Base Address = IFC000
IFOOOO
16
ADDRESS
SPACE
E1406
ADDRESS MAP
FFFFFF
EOOOOO
16
16
A24
16
A16
ADDRESS
SPACE
IFCOOO
16
200000
*
A16 REGISTER MAP
E1442A
Status/Control Register
Device Type Register
(2,080,768)
IFCOOO
or
*
O4
O2
OO
10
16
16
16
16
ID Register
CH 48-63 Control Register
CH 32-47 Control Register
CH 16-31 Control Register
CH 0-15 Control Register
SPACE
ADDRESS
REGISTER
200000
16
OFFSET
REGISTER
10
12
14
16
3E
3C
16
16
16
16
16
16
16-BIT WORDS
16
16
16
16
16
*
*