ST75951 datasheet(8/21 Pages) STMICROELECTRONICS

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SSI

Normal

Off-Hook

Ring or

non-masked GPIO

REG3 BIT4 = 1

Wake-up on Interrupt

Ring

PWRDWN

GPI

Ring

Processor reads REG2

ST75951 resets Bit GPI

OFF

Figure 5

FUNCTIONAL DESCRIPTION (continued)

Normal

Off-Hook

Ring

Output Pin

REG3 BIT4 = 1

Wake-up on Ring

Ring

PWRDWN

GPI '1'

OFF

SSI

Figure 4

5 - Mode of Operation

Thanks to MCM and M/S programmation pins we

can get the following configuration.

Configuration 1 : MCM = M/S = ’1’.

ST75951 is in master mode and we have :

FS = FQ / (M x Q x OVER). FS is an output.

(see Figure 6).

Configuration 2 : MCM = ’1’, M/S = ’ 0 ’.

ST75951 is in slave mode and the processor pro-

vides FS = (R x SCLK) OVER. FS is an input

(see Figure 7).

Configuration 3 : MCM = ’0’, M/S = ’1’.

ST75951 is in master mode and we have :

FS = FQ / (OVER). FS is an output (see Figure 8).

Configuration 4 : MCM = ’0’, M/S = ’ 0 ’.

The configuration 4 is equivalent to configuration 3

but the processor generates the FS and control the

phase.

ST75951 is in slave mode and the processor pro-

vides FS = (R x SCLK)/OVER. FS is an input

(see Figure 9).

Configuration 5 : Master codec 1 : MCM = ’0’,

M/S = ’ 1 ’. Slave codec 2 : MCM = ’0’, M/S = ’ 0 ’.

This is a dual codec application running on the

same SSI. The master codec has his data in times-

lot 0 ( bit 0 to bit15 ) and the slave codec has his

data in timeslot 1 (bit 16 to bit 31) thanks to the

programmation of TS (see Figure 10).

ST75951

8/21

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