Xycom XVME-653, Manual

Page: 67 / 113

Chapter 4 – Programming
4-11
Write Configuration Word
This function writes individual words from the configuration space of the VMEbus inter-
face. 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 in 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
Write Configuration Dword
This function writes individual dwords from the configuration space of the VMEbus in-
terface. The Register Number parameter must be a multiple of four (i.e., bits 0 and 1
must be set to 0).
ENTRY:
[AH] BIOS_FUNCTION_ID = B1h
[AL] BIOS_SUBFUNCTION_ID = 0Dh
[BH] Bus Number (0-255)
[BL] Device Number in upper 5 bits
Function Number is bottom 3 bits
[DI] Register Number (0, 4, 8, ...252)
[ECX] Dword Value to Write
EXIT:
[AH] Return Code:
00h = SUCCESSFUL
87h = BAD_REGISTER_NUMBER
[CF] Completion Status, set = error, reset = success