SCF5249 datasheet(21/56 Pages) FREESCALE

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Signal Descriptions

SCF5249 Integrated ColdFire® Microprocessor Data Sheet, Rev. 3

Freescale Semiconductor

Table 9. Serial Audio Interface Signals

Serial Module Signal

Description

Serial Audio Bit Clock

The SCLK1, SCLK2/GPIO48 and SCLK3/GPIO49, and

SCLK4/GPIO50 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, LRCK2/GPIO44, LRCK3/GPIO45, and LRCK/GPIO46

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.

Serial Audio Data In

The SDATAI1, SDATAI3/GPIO41, and SDATAI4/GPI42 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. The

functionality of these pins is programmed with the GPIO-FUNCTION

and GPIO1-FUNCTION registers. During reset, the pins are configured

as serial data inputs.

Serial Audio Data Out

The SDATAO1/GPIO25 AND SDATAO2/GPI41 multiplexed pins can

serve as general purpose I/Os or serial audio outputs. The functionality

of these pins is programmed with registers GPIO-FUNCTION and

GPIO1-FUNCTION. During reset, the pins are configured as serial

data outputs..

Serial audio error flag

The EF/GPIO19 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/GPIO19 is only relevant for serial

interface interface 1.

Serial audio CFLG

The CFLG/GPIO18 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/GPIO18 is only relevant for serial

interface 1.

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