CS493002-CL Cirrus Logic, CS493002-CL Datasheet - Page 68

• Manufacturer Part Number: CS493002-CL
• Description: Multi-Standard Audio Decoder Family
• Manufacturer: Cirrus Logic

is presented most significant bit first. It should be
noted that in the multichannel modes the SCLK
rate must be greater than the number of bits per
channel multiplied by the number of channels. In
the example SCLK must be greater than M * 6.
Because each of the ports is fully configurable
(SCLK polarity, LRCLK polarity, Word Width,
SCLK Rate) not all modes have been presented.
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.
Audio Input Port,” on page 68
68
S D A T A
LR C LK
S C LK
M S B
P er C hannel
M C locks
S D A T A
S D A T A
L R C K
S C L K
LR C K
S C L K
L S B
M S B
Figure 44. Left Justified Format (Rising Edge Valid SCLK)
P er Channel
M S B
M Clocks
Table 13, “Digital
M S B
LS B
shows the pin
Figure 45. Multichannel Format
M S B
Le ft
Le ft
P er C h annel
LS B
M C lock s
Figure 43. I
L S B
LS B
2
S Format
names, mnemonics and pin numbers associated
with the DAI.
The DAI is fully configurable including support for
I
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
SDATAN1
STCCLK2
SCLKN1
LRCLKN1
M S B
2
M S B
S, left justified and multichannel formats. In
Pin Name
P er C hann el
M C locks
M S B
LS B
Table 13. Digital Audio Input Port
R ig ht
R ig ht
M S B
L S B
Secondary STC clock
P er C hannel
CS49300 Family DSP
M C lock s
Pin Description
Serial Bit Clock
Serial Data In
Frame Clock
LS B
LS B
M S B
M S B
P er Ch annel
M Clocks
L SB
Pin Number
DS339PP4
22
25
26
M S B