SCF5250LPV100 datasheet(16/56 Pages) FREESCALE

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SCF5250 Data Sheet: Technical Data, Rev. 1.3

Freescale Semiconductor

3.10

Serial Audio Interface Signals

Table 7 describes the signals that provide the external audio interface.

3.11

Digital Audio Interface Signals

Table 8 describes the signals for the digital audio interface.

Table 7. Serial Audio Interface Signals

Serial Module Signal

Description

Serial Audio Bit Clock

The SCLK1/GPIO20, SCLK2/GPIO22 and SCLK3/GPIO35,

multiplexed pins can serve as general purpose I/Os or serial audio bit clocks. As bit clocks, these

bidirectional pins can be programmed as outputs to drive their associated serial audio (IIS) bit clocks.

Alternately, these pins can be programmed as inputs when the serial audio bit clocks are driven

internally. The functionality is programmed within the Audio module. During reset, these pins are

configured as input serial audio bit clocks.

Serial Audio Word Clock The LRCK1/GPIO19, LRCK2/GPIO23 and LRCK3/GPIO43/AUDIO_CLOCK multiplexed pins can

serve as general purpose I/Os or serial audio word clocks. As word clocks, the bidirectional pins can

be programmed as inputs to drive their associated serial audio word clock. Alternately, these pins can

be programmed as outputs when the serial audio word clocks are derived internally. The functionality

is programmed within the Audio module. During reset, these pins are configured as input serial audio

word clocks.

LRCK3/GPIO43/AUDIO_CLOCK can be used as the external audio clock input. If the core clock

chosen to be non-audio specific.

Serial Audio Data In

The SDATAI1/GPIO17 and SDATAI3/GPIO8 multiplexed pins can serve as general purpose I/Os or

serial audio inputs. As serial audio inputs the data is sent to interfaces 1and 3 respectively. During

reset, the pins are configured as serial data inputs.

Serial Audio Data Out

SDATO1/TOUT0/GPIO18 AND SDATAO2/GPIO34 multiplexed pins can serve as general purpose I/Os

or serial audio outputs. During reset, the pins are configured as serial data outputs.

Serial audio error flag

The EF/GPIO6 multiplexed pin can serve as general purpose I/Os or error flag input. As error flag

input, this pin will input the error flag delivered by the CD-DSP. EF/GPIO6 is only relevant for serial

interface SDATAI1.

Serial audio CFLG

The CFLG/GPIO5 multiplexed pin can serve as general purpose I/O or CFLG input. As CFLG input,

the pin will input the CFLG flag delivered by the CD-DSP. CFLG/GPIO5 is only relevant for serial

interface SDATAI1.

Table 8. Digital Audio Interface Signals

Serial Module Signal

Description

Digital Audio In

The EBUIN1/GPIO36, EBUIN2/SCLK_OUT/GPIO13, EBUIN3/CMD_SDIO2/GPIO14, and

QSPI_CS0/EBUIN4/GPIO15 multiplexed signals can serve as general purpose input or can be driven

by various digital audio (IEC958) input sources. Both functions are always active. Input chosen for

IEC958 receiver is programmed within the audio module. Input value on the 4 pins can always be read

from the appropriate GPIO register.

Digital Audio Out

The EBUOUT1/GPIO37 and QSPI_CS1/EBUOUT2/GPIO16 multiplexed pins can serve as general

purpose I/O or as digital audio (IEC958) output. EBUOUT1 is digital audio out for consumer mode,

EBUOUT2 is digital audio out for professional mode. During reset, the pin is configured as a digital audio

output.

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