Switch User Manual

Signal Description
D15343-003 37
Table 11. DVOB and DVOC Port Common Signal Descriptions
3.5.3 Analog CRT Display
Table 12. Analog CRT Display Signal Descriptions
Name Type Description
DVOBCINTR# I
DVO
DVOBC Interrupt: This pin is used to signal an interrupt, typically used to
indicate a hot plug or unplug of a digital display.
ADDID[7:0] I
DVO
ADDID[7:0]: These pins are used to communicate to the Video BIOS
when an external device is interfaced to the DVO port.
Note: Bit[7] needs to be strapped low when an on-board DVO device is
present. The other pins should be left as NC.
ADDID[0] = 0, Reserve
ADDID[0] = 1, the Intel
®
82854 GMCH is strapped to operate under
Native Graphic Mode
For detail of strapping option, please refer to Table 33.
DVODETECT I
DVO
DVODETECT: This strapping signal indicates to the GMCH whether a
DVO device is present or not. When a DVO device is connected, then
DVODETECT = 0.
Pin Name Type Description
VSYNC O
CMOS
CRT Vertical Synchronization: This signal is used as the vertical sync signal.
HSYNC O
CMOS
CRT Horizontal Synchronization: This signal is used as the horizontal sync
signal.
RED O
Analog
Red (Analog Video Output): This signal is a CRT Analog video output from
the internal color palette DAC. The DAC is designed for a 37.5-Ω equivalent
load on each pin (that is, a 75-Ω resistor on the board, in parallel with the 75-Ω
CRT load).
RED# O
Analog
Red# (Analog Output): Tied to ground.
GREEN O
Analog
Green (Analog Video Output): This signal is a CRT analog video output from
the internal color palette DAC. The DAC is designed for a 37.5-Ω equivalent
load on each pin (that is, a 75-Ω resistor on the board, in parallel with the 75- Ω
CRT load).
GREEN# O
Analog
Green# (Analog Output): Tied to ground.
BLUE
O
Analog
Blue (Analog Video Output) : This signal is a CRT Analog video output from
the internal color palette DAC. The DAC is designed for a 37.5-Ω equivalent
load on each pin (that is, a 75-ohm resistor on the board, in parallel with the 75-
Ω CRT load).
BLUE#
O
Analog
Blue# (Analog Output): Tied to ground.