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TECHNICAL SERVICE MANUAL
5.2 Intel 82855GME Graphics and Memory Controller Hub (GMCH)
Hub Interface Signals
Signal Name
Type
I/O
Packet Data: Data signals used for HI read and write operations.
HL[10:0]
Hub
I/O
Packet Strobe: One of two differential strobe signals used to transmit
HLSTB
Hub
or receive packet data over HI.
I/O
Packet Strobe Complement: One of two differential strobe signals
HLSTB#
Hub
used to transmit or receive packet data over HI.
Dedicated LVDS LCD Flat Panel Interface Signal Descriptions
Name
Type
Voltage
O
1.25 V± 225 mV Channel A differential clock pair output (true):
ICLKAP
LVDS
O
1.25 V±225 mV
ICLKAM
LVDS
O
1.25 V±225 mV
IYAP[3:0]
LVDS
O
1.25 V±225 mV
IYAM[3:0]
LVDS
O
1.25 V±225 mV
ICLKBP
LVDS
O
1.25 V±225 mV
ICLKBM
LVDS
O
1.25 V±225 mV
IYBP[3:0]
LVDS
O
1.25 V± 225 mV Channel B differential data pair 3:0 output
IYBM[3:0]
LVDS
Description
Description
245-800 MHz
Channel A differential clock pair output
(compliment): 245-800 MHz.
Channel A differential data pair 3:0 output (true):
245-800MHz.
Channel A differential data pair 3:0 output
(compliment): 245-800 MHz.
Channel B differential clock pair output (true):
245-800 MHz.
Channel B differential clock pair output
(compliment): 245-800 MHz.
Channel B differential data pair 3:0 output (true):
245-800MHz.
(compliment): 245-800 MHz.
Digital Video Output B (DVOB) Port Signal Descriptions
Name
Type
O
DVOB Data: This data bus is used to drive 12-bit RGB data on each
DVOBD[11:0]
DVO
edge of the differential clock signals, DVOBCLK and DVOBCLK#.
This provides 24-bits of data per clock period. In dual channel mode,
this provides the lower 12-bits of pixel data.
DVOBD[11:0] should be left as left as NC ("Not Connected") if not
used.
O
Horizontal Sync: HSYNC signal for the DVOB interface.
DVOBHSYNC
DVO
DVOBHSYNC should be left as left as NC ("Not Connected") if not
used.
O
Vertical Sync: VSYNC signal for the DVOB interface.
DVOBVSYNC
DVO
DVOBVSYNC should be left as left as NC ("Not Connected") if the
signal is NOT used when using internal graphics device.
DVOBBLANK# O
Flicker Blank or Border Period Indication: DVOBBLANK# is a
DVO
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.
DVOBBLANK# should be left as left as NC ("Not Connected") if not
used.
DVOBFLDSTL I
TV Field and Flat Panel Stall Signal. This input can be
DVO
programmed to be either a TV Field input from the TV encoder or
Stall input from the flat panel.
DVOB 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.
DVOB 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.
DVOBFLDSTL needs to be pulled down if not used.
92
Prestigio Nobile 150
Description
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