TCM4400EPET datasheet(54/64 Pages) TI

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TCM4400E

GSM/DCS BASEBAND AND VOICE A/D

AND D/A RF INTERFACE CIRCUIT

SLWS082A – JULY 1999 – REVISED MARCH 2000

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION

voiceband control register

The values in the voiceband control register have the meaning shown in Table 22.

Table 22. Voiceband Control Register

VBCTL3: VOICEBAND CONTROL REGISTER

ADDRESS: 12

R/W

RESERVD

VCLKMODE

DAIMD1

DAIMD0

VDAI

DAION

VALOOP

VIZBUS

VRST

1 / 0

R = 0

R /W

R/W

<–ACCESS TYPE

<–VALUE AT RESET

VALOOP:

When set to 1, the internal analog loop of output samples are sent to the audio input

terminal; standard audio paths are connected together, and auxiliary audio paths are

connected together.

VIZBUS:

When set to 1, VFS, VCLK, and VDX are put in a hi-Z state when there is nothing to transfer

to the DSP. When cleared to 0, VFS and VCLK are put in VSS when there is nothing to

transfer to the DSP, and the VDX bus drives an undefined value (value depends on the

previous serial data transfers).

VRST:

When 1, resets the digital parts of the audio codec (digital filter and modulator). This is not a

toggle bit and has to be set to 0 to remove the reset condition

DAION:

When cleared to 0, the DAI block is in power down; when set to 1, the DAI block is active.

VDAI:

Writing a 1 to this bit starts the SSCLK (104 kHz DAI clock) on reception of the first sample.

This bit is automatically reset to 0 by SSRST after reception of the last sample.

RESERVD:

Reserved bits for testing

DAIMD (0–1):

DAI mode selection as given in Table 23.

VCLKMODE:

When cleared to 0, allows selection of VCLK in burst mode. When set to 1, allows selection

of VCLK in continuous mode.

Table 23. DAI Mode Selection

DAIMD1

DAIMD0

DAI MODE

Normal operation (no tested device using DAI)

Test of speech decoder / DTX functions (downlink)

Test of speech encoder / DTX functions (uplink)

Test of acoustic devices and A/D and D/A (voice path)

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