Vmebus Short 110 Space - Xycom XVME-678 Manual

Chapter 4 - Programming
The VMEbus interrupt level acknowledged is determined by the window address read, as shown below:
Window Address VMEbus Interrupt Level
OEOO03 1
OEOO05 2
OEOO07 3
OEOO09 4
OEOOOB 5
OEOOOD 6
OEOOOF
7
4.3.3 VMEbus Short 110 Space
When the window is configured for VMEbus Short 110, the entire 64 Kbyte Short 110 address space can
be accessed through the 64 Kbyte window. Any references to the window map into the VMEbus Short
I/O space with the CPU's lower 16 address bits being used as the VMEbus 16-bit address.
Example:
4-10
This example uses the MS-DOS Debug program to display and alter memory in the
VMEbus Short 110 memory space. The example displays memory at Short 110 address
1000H and modifies memory location 1081H.
DEBUG
-030 26
-D EOOO: 1000
-EEOOO: 1081 03
-030 06
;Enter Debugger
;Write to the Control Register to enable the Short I/O
;Address Space in the Real Mode Window
;Display Short I/O memory beginning at location 1000H
;Enter the value 03 at Short 110 address 108lH
;Write to Control Register port to set Real Mode Window
;back to EPROM