
L64222 DVD Audio/Video Decoder
19
Audio Interface
REXT
A/D External Bias Resister
Output
A 100 K
resister is typically connected from this pin to
the AVSS pin to set the bias current for the Microphone
input A/D converter.
DATA_INP
Microphone Input
Input
An external microphone signal can be connected to the
pin, e.g., for karaoke mode. Multiple microphone outputs
must be externally summed before being connected to
this pin.
CD_ASDATA
CD Mode Audio/Video Data
Input
Serial audio/video data from a CD drive or other storage
device. Connected directly to the ASDATA0 and
ASDATA3 outputs when the host selects the CD Bypass
mode. Read into the channel input FIFO for audio and
video decoding for video CDs. Sent to the audio
postprocessor when input is CD DTS.
CD_BCLK
CD Mode DAC Bit Clock
Input
Bit clock from CD drive. Connected directly to the BCLK
output when the host selects the CD Bypass mode.
CD_LRCLK
CD Mode DAC Left/Right Clock
Input
Left/right sample clock from CD drive. Connected directly
to the LRCLK output when the host selects the CD
Bypass mode.
CD_ACLK
CD Mode DAC Clock
Input
DAC clock from CD drive. Connected directly to the
A_ACLK output when the host selects the CD Bypass
mode.
ASDATA[3:0] Audio Serial Data
Output
Serial audio data from the L64222 Audio Decoder in
nonbypass modes. The data can be Dolby Digital,
MPEG, Linear PCM, MLP, or DVD audio. Serial audio
data from the CD_ASDATA input in CD Bypass mode.
BCLK
DAC Bit Clock
Output
Serial data bit clock used by the L64222’s DAC interface
to serialize the decoded audio data. BCLK is used by the
external DAC to clock audio data in on the rising edge.