TCM4400E Datasheet, PDF (54/64 Pages) Texas Instruments – GSM/DCS BASEBAND AND VOICE A/D AND D/A RF INTERFACE CIRCUIT

TCM4400E
GSM/DCS BASEBAND AND VOICE A/D
AND D/A RF INTERFACE CIRCUIT
SLWS082A – JULY 1999 – REVISED MARCH 2000
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
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{VBCTL3: VOICEBAND CONTROL REGISTER}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{RESERVD RESERVD VCLKMODE DAIMD1 DAIMD0}
VDAI
DAION
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{R = 0}
R=0
R /W
R/W
R/W
R/W
R/W
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
0
0
0
0
0
0
VALOOP
R/W
0
VIZBUS
R/W
0
VRST
R/W
0
ADDRESS: 12 R/W
0 1 1 0 0 1/0
<–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 V_SS 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
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _DAIMD1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₀
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ¹
DAIMD0
0
1
0
1
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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