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HP E1459A Register Definitions 77
For example, for the HP 75000 Series C Mainframe with an HP E1406
Command Module, VXI A16 address space starts at 1F0000
h
(
h
= HEX). In
the HP E1406 Command Module, the A16 space is divided so modules are
addressed only at locations beginning with C000
h
within A16. Each module
is allocated 64 register addresses (40
h
). The module base address is related
to the logical address set by the logical address switch on the module:
base address (
h
) = (logical address
h
)*40
h
+ C000
h
For the HP E1459A, the factory-set logical address is 144 (90
h
), so to
address the Status/Control register of an HP E1459A using the HP E1406
Command Module:
base address = (90
h
)*(40
h
) + C000
h
> = E400
h
register address = [A16 location]
h
+ [base addr]
h
+ [register offset]
h
register address = 1F0000
h
+ E400
h
+ 04
h
= 1FE404
h
Register Definitions
The following registers can be accessed on the HP E1459A:
• ID Register (base + 00
h
)
• Device Type Register (base + 02
h
)
• Status/Control Register (base + 04
h
)
• Edge Interrupt Status Register (base + 06
h
)
• Data Available Status Register (base + 08
h
)
• Watchdog Timer Control/Status Register (base + 0A
h
)
• Command Register of Port 0/2 (base + 10
h
)
• Channel Data Register of Port 0/2 (base + 12
h
)
• Positive Edge Detect Register of Port 0/2 (base + 14
h
)
• Negative Edge Detect Register of Port 0/2 (base + 16
h
)
• Positive Mask Register of Port 0/2 (base + 18
h
)
• Negative Mask Register of Port 0/2 (base + 1A
h
)
• Debounce Clock Control/Status Register of Port 0 and 1/Port 2 and 3
(base + 1E
h
)
• Command Register of Port 1/3 (base + 20
h
)
• Channel Data Register of Port 1/3 (base + 22
h
)
• Positive Edge Detect Register of Port 1/3 (base + 24
h
)
• Negative Edge Detect Register of Port 1/3 (base + 26
h
)
• Positive Mask Register of Port 1/3 (base + 28
h
)
• Negative Mask Register of Port 1/3 (base + 2A
h
)
• Debounce Clock Control/Status Register of Port 0 and 1/Port 2 and 3
(base + 2E
h
)