Xycom XVME-654, Manual

Page: 63 / 98

Chapter 4 – Programming
4-12
Write Configuration Byte
This function writes individual bytes from the configuration space of the VMEbus
interface.
ENTRY:
[AH] BIOS_FUNCTION_ID = B1h
[AL] BIOS_SUBFUNCTION_ID = 0Bh
[BH] Bus Number (0-255)
[BL] Device Number is upper 5 bits
Function Number is bottom 3 bits
[DI] Register Number (0...255)
[CL] Byte Value to Write
EXIT:
[AH] Return Code:
00h = Successful
87h = Bad Register Number
[CF] Completion Status, set = error, reset = success
Write Configuration Word
This function writes individual words from the configuration space of the VMEbus
interface. The Register Number parameter must be a multiple of two (i.e., bit 0 must be
set to 0).
ENTRY:
[AH] BIOS_FUNCTION_ID = B1h
[AL] BIOS_SUBFUNCTION_ID = 0Ch
[BH] Bus Number (0-255)
[BL] Device Number is upper 5 bits
Function Number is bottom 3 bits
[DI] Register Number (0, 2, 4, ...254)
[CX] Word Value to Write
EXIT:
[AH] Return Code:
00h = Successful
87h = Bad Register Number
[CF] Completion Status, set = error, reset = success
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