SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 200

• Manufacturer Part Number: SPC8106
• Description: LCD/CRT VGA CONTROLLER
• Manufacturer: S-MOS Systems

The VESA VBE sub-Function 15h is used to implement the VBE / DDC services. The VBE / DDC
services are defined as follows:
BIOS Functional Specification
SP2-30
Function 15h - Display Identification Extensions
(valid for BIOS version 1.2 or greater)
Sub-Function 00h - Report VBE / DDC Capabilities
Sub-Function 01h - Read EDID
Return:
All other registers may be destroyed.
Input:
Return:
All other registers may be destroyed.
Input:
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AL
BL
CX
AX
BH
CX
AH
AL
BL
CX
ES:DI
AX
BH
BL
CX
ES:DI
AH
AL
BL
= 10h
= 02h
= 00h
=
= 00h
= 01h
= 02h
= 04h
= 08h
All other BH values are reserved and may be used to signal
other power saving states in future revisions of VBE/PM. For
future compatibility, applications written for VBE/PM 1.0
should ignore the value of bits 4 to 7.
=
= 4Fh
= 15h
= 00h
= 00h
=
=
=
=
= 4Fh
= 15h
= 01h
VBE/PM Services.
Get Display Power State.
Controller unit number (00 = primary controller).
Status.
Power state currently requested by the controller.
ON
STANDBY
SUSPEND
OFF
REDUCED ON
Unchanged
VESA Extension.
VBE/DDC Services.
Report VBE/DDC Capabilities.
Controller unit number (00 = primary controller).
Null pointer, must be 0000:0000h in version 1.0.
Reserved for future use.
Status
Approximate time, in seconds, rounded up, to transfer one EDID block (128
bytes).
DDC level supported.
bit 0 = 0 DDC1 not supported
bit 1 = 0 DDC2 not supported
bit 2 = 0 screen not blanked during data transfer
Unchanged
Unchanged
VESA Extension.
VBE/DDC Services.
Read EDID.
= 1 DDC1 supported
= 1 DDC2 supported
= 1 screen blanked during data transfer
X12-SP-002-03.1
411-1.0
SPC8106