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Chapter 13 SIB Module

13-11

13.3.6

Data Formats

The TMPR3911/12’s SIB Module logic contains transmit and receive holding registers which are

used by the DMA circuit or CPU to write and read sound and telecom data and SIB control and status

data corresponding to the appropriate subframe (0 or 1), according to the configuration as determined

by the SELSNDSF1 control bit. Similarly, the TELTXHOLD and TELRXHOLD registers are used for

transmit and receive telecom data corresponding to the appropriate subframe (0 or 1), according to the

configuration as determined by the SELTELSF1 control bit. All of these holding registers are 32 bits

wide, and the appropriate shift register fields for each subframe are written to or read from based on the

programmed sound and telecom samples rates, mono versus stereo mode, and 8-bit versus 16-bit

modes.

The SF0AUX and SF1AUX control holding registers and SF0STAT and SF1STAT status holding

registers are also 32 bits wide. Each of these control holding registers updates the control fields for the

respective subframe once per frame. These transmit holding registers load the same control data into the

shift register until the CPU updates the contents of the holding register. Similarly, the status holding

registers are updated from the received status data in the shift register once per frame. The contents of

the receive holding registers are available to be read by the CPU at any time.

The SIB data format for transfers to and from TC35143 is shown in Figure 13.3.4. Each word

consists of fields containing audio data, telecom data, and control register address and data. During each

frame, data is transferred bi-directionally (using SIBDIN and SIBDOUT) for all of these fields. For

instance, the audio data field is written once every frame (from the TMPR3911/12 to TC35143) via

SIBDOUT and also returns audio data (from TC35143 to the TMPR3911/12) at the same time via

SIBDIN.

016

audio data[11:0]

Telecom data[15:0]

write

Audio vflag

telecom vflag

Figure 13.3.4 Data Format for TC35143 Word Interface

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