EP7209 Datasheet, PDF(35/128 Page) Cirrus Logic – Ultra-Low-Power Audio Decoder System-on-Chip

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EP7209 Datasheet, PDF (35/128 Pages) Cirrus Logic – Ultra-Low-Power Audio Decoder System-on-Chip

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EP7209

these pins. When the DAISEL bit is set high, the

DAI interface is connected to the external pins. On

power up, both the DAISEL and SERSEL bits are

reset low, thus the master/slave SSI2 will be con-

nected to these pins (and configured for slave mode

operation to avoid external drive clashes).

Table 20 contains pin definition information for the

three multiplexed interfaces.

The internal names given to each of the three inter-

faces are unique to help differentiate them from

each other. The sections below that describe each

of the three interfaces will use their respective

unique internal pin names for clarity.

Type

SPI/Microwire 1

SPI/Microwire 2

DAI Interface

Codec Interface

Comments

Master mode only

Master/slave mode

CD quality DACs and ADCs

Only for use in the PLL clock mode

Referred To As

ADC Interface

SSI2 Interface

DAI Interface

Codec Interface

Table 19. Serial Interface Options

Max. Transfer Speed

128 kbits/s

512 kbits/s

1.536 Mbits/s

64 kbits/s

No.

LQFP

External

Pin Name

SSICLK

SSITXFR

SSITXDA

SSIRXDA

SSIRXFR

SSI2

Slave Mode

(Internal Name)

SSI2

Master Mode

SSICLK = serial bit

clock; Input

Output

SSKTXFR = TX

frame sync; Input

Output

SSITXDA = TX data;

Output

SSIRXDA = RX data;

Input

SSIRXFR = RX

frame sync; Input

Output

Codec

Internal Name

PCMCLK =

Output

PCMSYNC = Output

PCMOUT = Output

PCMIN = Input

p/u

(use a 10k pull-up)

Table 20. Serial-Pin Assignments

DAI

Strength

Internal Name

SCLK =

Output

LRCK = Output

SDOUT = Output

SDIN = Input

MCLK

DS453PP2

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