CS493263-CL View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS493263-CL Datasheet PDF : 90 Pages
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CS49300 Family DSP
10.2. Digital Audio Input Port
The digital audio input port, or DAI, is used for both
compressed and PCM digital audio data input. In
addition this port supports a special clocking mode
in which a clock can be input to directly drive the
internal 33 bit counter. Table 13, “Digital Audio
Input Port,” on page 70 shows the pin names,
mnemonics and pin numbers associated with the
DAI.
Pin Name
SDATAN1
STCCLK2
SCLKN1
LRCLKN1
Pin Description
Serial Data In
Secondary STC clock
Serial Bit Clock
Frame Clock
Pin Number
22
25
26
Table 13. Digital Audio Input Port
The DAI is fully configurable including support for
I2S, left justified and multichannel formats. In
addition the DAI can be programmed for slave
clocks, where LRCLKN1 and SCLKN1 are inputs,
or master clocks, where LRCLKN1 and SCLKN1
are outputs. In order for clocks to be master, the
internal PLL must be used.
STCCLK2 can also be programmed to drive the
internal 33 bit counter. This counter would typically
be driven by a 90kHz clock. The internal counter is
used by certain application code for audio/video
synchronization purposes.
10.3. Compressed Data Input Port
The compressed data input port, or CDI, can be
used for both compressed and PCM data input.
Table 14 shows the mnemonic, pin name and pin
number of the pins associated with the CDI port on
the CS493XX.
Pin Name
SDATAN2
CMPDATA
SCLKN2
CMPCLK
LRCLKN2
CMPREQ
Pin Description
Serial Data In
Compressed Data In
Serial Bit Clock
Frame Clock
Data Request Out
Pin Number
27
28
29
Table 14. Compressed Data Input Port
The CDI is fully configurable including support for
I2S, left justified and multichannel formats. The CDI
can also be programmed for slave clocks, where
LRCLKN2 and SCLKN2 are inputs, or master
clocks, where LRCLKN2 and SCLKN2 are outputs.
In order for clocks to be mastered, the internal PLL
must be used.
In addition the CDI can be configured for bursty
compressed data input. Bursty audio delivery is a
special format in which only clock (CMPCLK) and
data (CMPDAT) are used to deliver compressed
data to the CS493XX (i.e. no frame clock or
LRCLK). A third line, CMPREQ, is used to request
more data from the host. It is an indicator that the
CS493XX internal FIFO is low on data and can
accept another burst. Typically this mode is used
for compressed data delivery where asynchronous
data transfer occurs in the system, i.e. in a system
such as a set-top box or HDTV. PCM data can not
be presented in this mode since data is interpreted
as a continuous stream with no word boundaries.
10.4. Byte Wide Digital Audio Data Input
Two types of byte wide parallel delivery are
supported by the CS493XX. If using one of the
parallel control modes described in Section 6.2,
“Parallel Host Communication” on page 44, then
the parallel interface can also be used for
LRCLK
SCLK
SDATA
MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
LSB MSB
M Clocks
Per Channel
M Clocks
Per Channel
M Clocks
Per Channel
M Clocks
Per Channel
Figure 45. Multichannel Format
M Clocks
Per Channel
M Clocks
Per Channel
70
DS339F7
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