Modes Of Operation Overview; Pxa27X Processor Provides Bitclk Signal To Codec - Intel PXA27 Series Design Manual

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I S Interface
14.5

Modes of Operation Overview

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The I S controller has two modes of operation:
•
The PXA27x processor I
CODEC.
•
The external CODEC supplies BITCLK as an input signal to PXA27x processor I
14.5.1

PXA27x Processor Provides BITCLK signal to CODEC

In this mode of operation, the BITCLK signal is an output to the CODEC; SYSCLK must be
configured as an output.
14.5.1.1 Signals
See Table 14-2
PXA27x processor provides BITCLK to the CODEC.
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Table 14-2. I S Controller Interface to CODEC (PXA27x Processor Providing BITCLK to
CODEC)
Name
SYSCLK
BITCLK
SYNC
SDATA_OUT
SDATA_IN
II:14-4
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S controller supplies the BITCLK as an output signal to the external
for the list of the signals between the I
Direction
System Clock = BITCLK x 4 used by the CODEC only
Output
SYSCLK is driven out of the I
configured as an output
Bit-rate clock = SYNC x 64
Output
SYSCLK must be configured as an output
Left/Right identifier
Output
SYNC is BITCLK divided by 64
Output Serial audio output data to CODEC
Input Serial audio input data from CODEC
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S and an external CODEC device when the
Description
2
S controller only if BITCLK is
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Intel PXA27x Processor Family Design Guide
2
S controller.