TMPR3911 datasheet(282/462 Pages) TOSHIBA

282 / 462 page

Chapter 13 SIB Module

13-12

The SF0AUX control holding register and SF0STAT status holding register map directly to bits 16-31

and 48-63 of the subframe 0 word format. See Table 13.3.3 which shows the mapping of SF0AUX and

SF0STAT bit positions to the respective TC35143 fields. For TC35143, the audio and telecom “vflag”

bits (valid flags) in the transmit direction are dynamically asserted to TC35143 for one subframe each

time a new sample is being transmitted. The audio and telecom “vflag” bits in the receive direction are

statically asserted from TC35143 to the TMPR3911/12 only after the ADC’s are settled, all turn-on

delays have been met, etc. The TMPR3911/12 then uses these valid flags to determine when the receive

data from TC35143 is truly valid.

Table 13.3.3 SIB Subframe 0 Control/Status Bits and Fields

SF0AUX/SF0STAT

bits

TC35143 word bits

field definition

- - -

0-15

audio data

reserved for register extension; must write to 0 if not

used

30-27

17-20

write bit

25-18

22-29

reserved, must write to 0

audio valid flag

telecom valid flag

- - -

32-47

telecom data

15-0

48-63

The last 16 bits of the TC35143 word is made up of control register data. The exact contents and

definition of this field is defined by the register address field and the “write” bit. For a read cycle

(“write” bit

= 0), the address bits determine which TC35143 register to read and this read data is sent by

TC35143 within the control register data field of SIBDIN during the same frame as the read request

occurred. The separation between the address and data fields should make this possible. In addition,

during a read cycle, the control register data field of SIBDOUT is ignored by TC35143. For a write

cycle (“write” bit

= 1), the control register data contents of SIBDOUT are written to the TC35143

13.3.7

Subframe Formats

SIB subframe 0 is nominally reserved for interfacing to TC35143. Four possible sample-size modes

are supported for sound and telecom data (these are all mono sound and telecom formats):

sound

telecom

16-bit

8-bit

16-bit

8-bit

SIB subframe 1 is nominally reserved for interfacing to an external codec device.

For the external codec device, four possible sample-size modes are supported:

sound

telecom

16-bit stereo

16-bit

16-bit mono

8-bit

8-bit stereo

8-bit mono

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