Xycom XVME-654, Руководство пользователя

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Chapter 4 – Programming
4-11
Read Configuration Word
This function reads individual words from the VMEbus interface configuration space.
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 = 09h
[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)
EXIT:
[CL] Word Read
[AH] Return Code:
00h = Successful
87h = Bad Register Number
[CF] Completion Status, set = error, reset = success
Read Configuration Dword
This function reads individual dwords from the VMEbus interface configuration space.
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 = 0Ah
[BH] Bus Number (0-255)
[BL] Device Number is upper 5 bits
Function Number is bottom 3 bits
[DI] Register Number (0, 4, 8, ...252)
EXIT:
[ECX] Word Read
[AH]
Return Code:
00h = Successful
87h = Bad Register Number
[CF] Completion Status, set = error, reset = success
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