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3.3. AB Signal Descriptions

3.3.1. Audio Signals

Signal Pin Description I/O PU/PD Comment

AC_RST# /

HDA_RST#

A30 Reset output to CODEC, active low. O 3.3VSB

AC_SYNC /

HDA_SYNC

A29 Sample-synchronization signal to the CODEC(s). O 3.3V

AC_BITCLK /

HDA_BITCLK

A32 Serial data clock generated by the external

CODEC(s).

I/O 3.3V

AC _SDOUT /

HDA_SDOUT

A33 Serial TDM data output to the CODEC. O 3.3V

AC _SDIN[2:0]

HDA_SDIN[2:0]

B28-

B30

Serial TDM data inputs from up to 3 CODECs. I/O 3.3VSB

3.3.2. Analog VGA

Signal Pin Description I/O PU/PD Comment

VGA_RED B89 Red for monitor.

Analog DAC output, designed to drive a

37.5-Ohm equivalent load.

O Analog If VGA is used than signal should be

pulled to GND by 150Ω on the carrier

VGA_GRN B91 Green for monitor.

Analog DAC output, designed to drive a

37.5-Ohm equivalent load.

O Analog If VGA is used than signal should be

pulled to GND by 150Ω on the carrier

VGA_BLU B92 Blue for monitor.

Analog DAC output, designed to drive a

37.5-Ohm equivalent load.

O Analog If VGA is used than signal should be

pulled to GND by 150Ω on the carrier

VGA_HSYNC B93 Horizontal sync output to VGA monitor O 3.3V

VGA_VSYNC B94 Vertical sync output to VGA monitor O 3.3V

VGA_I2C_CK B95 DDC clock line (I²C port dedicated to identify

VGA monitor capabilities)

I/O OD 3.3V PU 2k2 3.3V

VGA_I2C_DAT B96 DDC data line. I/O OD 3.3V PU 2k2 3.3V

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