Datasheet 75
Signal Description
2.21 Analog Display /VGA DAC Signals
L_VDD_EN (available
in Desktop)
O
LVDS Panel Power Enable: Panel power control enable
control for LVDS or embedded DisplayPort*.
This signal is also called VDD_DBL in the CPIS specification
and is used to control the VDC source to the panel logic.
L_BKLTEN (available in
Desktop)
O
LVDS Backlight Enable: Panel backlight enable control for
LVDS or embedded DisplayPort.
This signal is also called ENA_BL in the CPIS specification
and is used to gate power into the backlight circuitry.
L_BKLTCTL (available
in Desktop)
O
Panel Backlight Brightness Control: Panel brightness
control for LVDS or embedded DisplayPort.
This signal is also called VARY_BL in the CPIS specification
and is used as the PWM Clock input signal.
LVDS_VREFH O Test mode voltage reference.
LVDS_VREFL O Test mode voltage reference.
LVD_IBG I LVDS reference current.
LVD_VBG O Test mode voltage reference.
Table 2-21. Analog Display Interface Signals
Name Type Description
VGA_RED
O
A
RED Analog Video Output: This signal is a VGA Analog video
output from the internal color palette DAC.
VGA_GREEN
O
A
GREEN Analog Video Output: This signal is a VGA Analog
video output from the internal color palette DAC.
VGA_BLUE
O
A
BLUE Analog Video Output: This signal is a VGA Analog video
output from the internal color palette DAC.
DAC_IREF
I/O
A
Resistor Set: Set point resistor for the internal color palette
DAC. A 1 k 1% resistor is required between DAC_IREF and
motherboard ground.
VGA_HSYNC
O
HVCMOS
VGA Horizontal Synchronization: This signal is used as the
horizontal sync (polarity is programmable) or “sync interval”. 2.5
V output
VGA_VSYNC
O
HVCMOS
VGA Vertical Synchronization: This signal is used as the
vertical sync (polarity is programmable). 2.5 V output.
VGA_DDC_CLK
I/O
COD
Monitor Control Clock
VGA_DDC_DATA
I/O
COD
Monitor Control Data
VGA_IRTN
I/O
COD
Monitor Interrupt Return
Table 2-20. LVDS Interface Signals (Sheet 2 of 2)
Name Type Description
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