Leaving The Gmch Dvob Or Dvoc Port Unconnected; Table 43. Gmbus Pair Mapping And Options - Intel 852GME Design Manual

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Table 43. GMBUS Pair Mapping and Options

Pair Signal Name
#
0 DDCADATA
DDCACLK
LCLKCTRLA
1
LCLKCTRLB
DDCPDATA
2
DDCPCLK
MDVIDATA
3
MDVICLK
MI2CDATA
4
MI2CCLK
MDDCDATA
5
MDDCCLK
All GMBUS pairs can be optionally programmed to support any interface and is programmed through the
NOTE:
BMP utility.
If any of GMBUS pairs (expect DDCADATA/DDCCLK for CRT) are not used, 2.2 k – 100 k pull-up
(or pull-ups with the appropriate value derived from simulating the signal), resistors are required except
for LCLKCTRLA/LCLKCTRLB GMBUS pair. This will prevent the GMCH DVOB interface from
confusing noise on these lines for false cycles.
7.5.1.

Leaving the GMCH DVOB or DVOC Port Unconnected

If the motherboard does not implement any of the possible video devices with the DVO port, please
follow the guidelines recommended on the motherboard. DVO Output signals may be left unconnected
if they are not used.
Pull-down resistors are required for the following signals if not used:
DVOBFLDSTL
DVOCFLDSTL
DVOBCCLKINT
Pull-up resistors are required for the following signals if not used:
DVOBCINTR#
126
Buffer
Type
3.3 V DDC for Analog monitor (CRT)
connection.
3.3 V For control of SSC clock generator
devices down on motherboard.
3.3 V DDC for Digital Display connection via
the integrated LVDS display port for
support for EDID panel.
1.5 V GMBUS control of DVI devices (TMDS
or TV encoder)
1.5 V GMBUS control of DVI devices (TMDS
or TV encoder)
1.5 V DDC for Digital Display connection via
TMDS device
® ®
Intel 852GME, Intel 852GMV and Intel
Integrated Graphics Display Port
Description
This can not be shared with other
DDC or I2C pairs due to legacy
monitor issues.
If SSC is not supported then can
be used for DVOB or DVOC
GMBUS.
If EDID panels are not supported.
Can optionally use as GMBUS
for DVOB or DVOC.
Can optionally use as GMBUS
for DVOB or DVOC.
Can optionally use as GMBUS
for DVOB or DVOC.
Can optionally use as GMBUS
for DVOB or DVOC.
®
852PM Chipset Platforms Design Guide
Notes