S/PDIF Receiver
13-14 ADSP-214xx SHARC Processor Hardware Reference
The input to the receiver (
DIR_I) is a biphase encoded signal that may
contain two audio channels (compressed or linear PCM) or non-audio
data. The receiver decodes the single biphase encoded stream, producing
an I
2
S compatible serial data output that consists of a serial clock, a
left-right frame sync, and data (channel A/B). It provides the programmer
with several methods of managing the incoming status bit information.
The S/PDIF receiver receives any S/PDIF stream with a sampling fre-
quency range of 32 kHz – 15% to 192 kHz + 15% range.
The channel status bits are collected into memory-mapped registers, while
other channel status and user bytes must be handled manually. The block
Figure 13-8. S/PDIF Receiver Block Diagram
DIR_CLK_O
DIR_FS_O
LRCLK_REF_O
DIR_DAT_O
PROCESSOR
PLL
LRCLK_FB_O
BIPAHSE
DECODING
REFRAMING
LOGIC
DIR_I
(BIPHASE STREAM)
S/PDIF RECEIVER
CLK
DIGITAL
PLL
DIR_TDMCLK_O
ANALOG
PLL
OFF-CHIP
REFIN
FBIN
FEEDBACK
DIVIDER = 512
STREAM
PREAMBLE
SPDIF_EXTPLLCLK_I
512 x FS
INT
PLLCLK
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