UM0851 datasheet(201/245 Pages) STMICROELECTRONICS

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UM0851

Audio/video drivers

Doc ID 16604 Rev 2

201/245

};

/* input clock source selection */

enum spear_tdm_clock {

TDM_CLK_CLKSM = 1, /* slave mode clock coming on CLK pin */

TDM_CLK_CLKROSC1,

/* It is the internally generated source clock, generally

24MHz.*/

TDM_CLK_CLKRSYNT3,

/* Internal clock, can be taken from PLL1 or PLL2 */

TDM_CLK_PLCLK4

/* External clock source,can be taken some external clock

source generator.*/

};

Sync signal generation

This API is used to configure the sync signal. It specifies the start and end of the signal. The

first argument is the structure of the sync register and the second argument defines whether

the channel used is narrowband or wideband.

spear_tdm_set_sync (struct spear_sync_gen *sync,u8 pcm_synchro);

struct spear_sync_gen {

enum spear_sync_type sync_type; /* used for the generation of sync signal.*/

enum spear_sync_delay delay; /* indicates the sync generation delayed value.*/

u8 sync_aligned;

/* indicates no delay. For delay pass sync_aligned

as 1 */

};

enum spear_sync_delay {

NODELAY = 0, //for no delay

DELAY1

= 1, //for 1 byte delay

DELAY2

= 2 , //for 2 byte delay

DELAY4

= 4

//for 4byte delay

};

enum spear_sync_type {

SYNC0 = 0, /* used in slave mode, sampled at slave clock rate (ClkSM) */

SYNC1, /* used in master mode */

SYNC2, /* used in master mode */

SYNC3 /* used in master mode */

};

Configuring timeslot

Configuring timeslot number

This API is used to configure the timeslot number register. The argument specifies the

number of timeslots contained in the frame. By programming 2 in the timeslot register

indicates that the sync signal will be generated after two timeslots.

/* max_ts: specifies the maximum number of timeslot user wants to configure. Maximum

timeslot can be configure is 1024(0x400). It will return zero on success and negative

value on error.*/

spear_tdm_ts_max(u32 max_ts);

Channel configuration

This API indicates how many channels are present. It also indicates how many valid bits are

used to indicate the channel number. The API is not used in Switching.

UM0851 Datasheet(PDF) 201 Page - STMicroelectronics

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