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Intel
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854 Graphics Memory Controller Hub (GMCH)
36 D15343-003
3.5.2 Digital Video Output C (DVOC) Port
Table 10. Digital Video Output C (DVOC) Port Signal Descriptions
Name Type Description
DVOCD[11:0] O
DVO
[Native Graphic Mode]
DVOC Data: This data bus is used to drive 12-bit RGB data on each edge
of the differential clock signals, DVOCCLK and DVOCCLK#. This
provides 24-bits of data per clock period. In dual channel mode, this
provides the upper 12-bits of pixel data.
DVOCD[11:0] should be left as left as NC (“Not Connected”) if not used.
DVOCHSYNC O
DVO
Horizontal Sync: HSYNC signal for the DVOC interface.
DVOCHSYNC should be left as left as NC (“Not Connected”) if not used.
DVOCVSYNC O
DVO
Vertical Sync: VSYNC signal for the DVOC interface.
DVOCVSYNC should be left as left as NC (“Not Connected”) if the signal
is NOT used when using internal graphics device.
DVOCBLANK# O
DVO
Flicker Blank or Border Period Indication: DVOCBLANK# is a
programmable output pin driven by the GMCH.
When programmed as a blank period indication, this pin indicates active
pixels excluding the border. When programmed as a border period
indication, this pin indicates active pixel including the border pixels.
DVOCBLANK# should be left as left as NC (“Not Connected”) if not used.
DVOCFLDSTL I
DVO
TV Field and Flat Panel Stall Signal. This input can be programmed to
be either a TV Field input from the TV encoder or Stall input from the flat
panel.
DVOC TV Field Signal: When used as a Field input, it synchronizes the
overlay field with the TV encoder field when the overlay is displaying an
interleaved source.
DVOC Flat Panel Stall Signal: When used as the Stall input, it indicates
that the pixel pipeline should stall one horizontal line. The signal changes
during horizontal blanking. The panel fitting logic, when expanding the
image vertically, uses this.
DVOCFLDSTL needs to be pulled down if not used.