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Chapter 3
Signals and Pinout Tables
COM 830
Reference Manual
33
TV_DAC_B
TVDAC Channel B Output supports the
following: Composite video: not used
Component video: Luminance (Y) analog
signal.
S-Video: Luminance analog signal.
O
Analog
PD 150R
Analog
output
TV_DAC_C
TVDAC Channel C Output supports the
following: Composite video: not used
Component: Chrominance (Pr) analog
signal.
S-Video: Chrominance analog signal.
O
Analog
PD 150R
Analog
output
Table 3-12. Miscellaneous Signal Descriptions
Signal
Description
I/O
PU/PD
Comment
I2C_CK
General purpose I²C port clock output
O 3.3V
PU 4k7
3.3V
I2C_DAT
General purpose I²C port data I/O line
I/O
3.3V
PU 4k7
3.3V
SPKR
Output for audio enunciator, the "speaker" in
PC-AT systems
O 3.3V
SPEAKER
is a boot
strap signal
(see note 1
below)
BIOS_DISABLE
#
Module BIOS disable input. Pull low to disable
module BIOS. Used to allow off-module BIOS
implementations.
I 3.3V
PU 4k7
3.3V
WDT
Output indicating that a watchdog time-out
event has occurred.
I 3.3V
PU 10k
3.3V
This signal
is not
supported
(see note 2
below)
KBD_RST#
Input to module from (optional) external
keyboard controller that can force a reset.
Pulled high on the module. This is a legacy
artifact of the PC-AT.
I
PU 10k
3.3V
KBD_A20GATE
Input to module from (optional) external
keyboard controller that can be used to control
the CPU A20 gate line. The A20GATE restricts
the memory access to the bottom megabyte and
is a legacy artifact of the PC-AT. Pulled low on
the module.
I
PU 10k
3.3V
NOTE
Some signals have special functionality during the reset process. They may
bootstrap some basic important functions of the module.
For more information about this signal, please visit Ask an Expert on the Ampro
web site.
Table 3-11. TV-Out Signal Descriptions (Continued)
Summary of Contents for COM 830
Page 1: ...COM 830 Computer On Module Reference Manual P N 5001829A Revision A ...
Page 10: ...Chapter 1 About This Manual 4 Reference Manual COM 830 ...
Page 90: ...Chapter 4 BIOS Setup Description 84 Reference Manual COM 830 ...
Page 92: ...Appendix A Technical Support 86 Reference Manual COM 830 ...