Intel 855GME

278
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Schematic Checklist Summary
12.3.4 Graphics Interfaces Checklist
12.3.4.1 Low Voltage Digital Signalling (LVDS) Checklist
Table 126 presents the LVDS checklist.
12.3.4.2 Digital Video Out (DVO) Checklist
Table 127 presents the DVO checklist. Figure 84 depicts the DPMS clock implementation.
Table 126. LVDS Checklist
Pin Name System
Pull-up/Pull-down
Notes
√
LIBG
1.5 K
Ω 1% pull-down to
GND
IYAP[3:0]/
IYAM[3:0]
IYBP[3:0]/
IYBM[3:0]
When any of these LVDS data pairs are unused, they
may be left as NC. The Intel CRB routes these data
pairs directly to a 30-pin dual channel LVDS
connector.
ICLKAP/ICLKAM
ICLKBP/ICLKBM
When either of these LVDS clock pairs is not used, it
may be left as NC.
DDCPCLK,
DDCPDATA
2.2 k to 10 k pull-up to 3.3 V
if not used.
LVDS Panel DDC Clock/Data pair to collect digital
display EDID information.
PANELVDDEN 100 k pull-down Used for LVDS Panel Power control.
PANELBKLTEN 100 k pull-down Used for LVDS Panel backlight enable.
PANELBKLTCTL 100 k pull-down Used for LVDS Panel backlight brightness control.
Table 127. DVO Checklist (Sheet 1 of 2)
Pin Name System
Pull-up/Pull-down
Notes
√
DVORCOMP
40.2
Ω 1% pull-down to
GND
Trace shall be 10-mil wide with 20-mil spacing.
GVREF
1K
Ω 1% pull-up to
V_1P5_CORE
1K
Ω 1% pull-down to GND
Signal voltage level = 1/2 of V_1P5_CORE. Need
0.1 µF cap at GMCH pin and near ADD slot pin (if
implemented).
DVOCD[11:0]
When unused, these signals may be left as NC.
DVO Routing is to ADD connector on Intel CRB. For
AGP these signals are: GAD[29:19] and GCBE#. See
Chapter 3.6.3 of the 855GME datasheet for exact
assignment.
DVOCCLK,
DVOCCLK#
When unused, these signals may be left as NC.
For AGP these signals are: GAD_STB1, GAD_STB1#.
DVOCHSYNC
When unused, these signals may be left as NC. For
AGP this signal is: GAD[17].
DVOCVSYNC
When unused, these signals may be left as NC. For
AGP this signal is: GAD[16].
DVOCBLANK# When unused, these signals may be left as NC. For
AGP this signal is: GAD[18].