Ab Signal Descriptions - ADLINK Technology COM Express cExpress-BL User Manual

3.3.

AB Signal Descriptions

3.3.1. Audio Signals
Signal Pin #
AC_RST# / A30
HDA_RST#
AC_SYNC / A29
HDA_SYNC
AC_BITCLK / A32
HDA_BITCLK
AC _SDOUT / A33
HDA_SDOUT
AC _SDIN[2:0] B28
HDA_SDIN[2:0] B29
B30
3.3.2. Analog VGA
Signal Pin #
VGA_RED B89
VGA_GRN B91
VGA_BLU B92
VGA_HSYNC B93
VGA_VSYNC B94
VGA_I2C_CK B95
VGA_I2C_DAT B96
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Description
Reset output to codec, active low.
Sample-synchronization signal to the codec(s).
Serial data clock generated by the external
codec(s).
Serial TDM data output to the codec.
Serial TDM data inputs from up to 3 codecs.
Description
Red for monitor.
Analog DAC output, designed to drive a
37.5-Ohm equivalent load.
Green for monitor
Analog DAC output, designed to drive a
37.5-Ohm equivalent load.
Blue for monitor.
Analog DAC output, designed to drive a
37.5-Ohm equivalent load.
Horizontal sync output to VGA monitor
Vertical sync output to VGA monitor
DDC clock line (I²C port dedicated to identify
VGA monitor capabilities)
DDC data line.
I/O PU/PD
O 3.3VSB
O 3.3V
I/O 3.3V
O 3.3V
I/O 3.3VSB PD 1M
I/O PU/PD
O Analog
O Analog
O Analog
O 3.3V
O 3.3V
I/O OD 3.3V
I/O OD 3.3V
Comment
VSB because PCH uses suspend
power for RESET
No AC/HDA_SDIN 2 (B28)
support on this platform
Comment
Not supported
Not supported
Not supported
Not supported
Not supported
Not supported
Not supported