7.4. Initialization. Silicon Laboratories Si2493, Si2404, Si2415, Si2434, Si2494, Si2439, Si2457, Si2443

AN93

7.4. Initialization

The following sequence is used after power up or hardware reset to prepare the modem for voice operations. This

procedure occurs in the Initialize state presented in Figure 33. After initialization, the system will be in the TAM

Hands-Free mode, which is discussed in "7.3.3.1. TAM Hands-Free".

Table 133. Initialization Sequence

Host to Modem Commands

Modem to

Host Result

Codes

Local Modem Actions

ATZ

ATE0+FCLASS = 0

AT+IPR = 115200

[ Apply Patch Commands ]

AT:U199|A

ATE0+FCLASS = 8

AT+VLS = 0

AT+VLS = 14

AT*Y254:W59|1

AT*Y0

AT+VCDT = 1

AT+VCID = 1

AT+VSD = 129

AT+PCW = 0

AT:U0B1,0500

AT:U0B5,0200

AT:U0B6,0100

AT:U0B9,0300

AT:U0B4,0600

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

Reset. The Si3000 is not reset by this command.

Disable local AT command echo and enter data mode, which is necessary for patch loading.

Disable autobaud and set rate to

115,200 bps.

Apply the modem patch commands.

Mute the microphone and speaker paths to the codec.

Disable local AT command echo and enter voice mode. Limited V.253 event reporting enabled with default setting of

+VLS=0.

Disable voice mode. Used as a transition point between non-zero +VLS voice modes.

Setup on-hook TAM voice mode. See

Table 131 on page 202 for details.

Enable the SSI interface to the Si3000.

Exit the AT*Y command mode.

Enable always-on Type I Caller ID.

Enable formatted Caller ID.

Set silence detection sensitivity level.

Enable Type II Caller ID reporting.

Set Si3000-to-DAA transmit gain.

Set DAA-to-Si3000 receive gain.

Set Sidetone gain.

Set VTS-to-Si3000 transmit gain.

Set VTS-to-DAA transmit gain.

Rev. 1.41

207

A N 9 3

AT:U196,5000

AT:U197,2000

AT:U19C,2400

AT:U19D,1800

AT:U19A,01E0

AT:U19B,001F

AT:U04F,01F4

AT:U156,FF10,FFA2,FFD7,FF35,FEF3,FE68,FB7E

AT:U15D,F90C,FDDF,091D,4F51,091D,FDDF,F90C

AT:U164,FB7E,FE68,FEF3,FF35,FFD7,FFA2,FF10

AT:U16B,0041,00B1,00AA,0001,FF92,0042,0183

AT:U172,0165,FEC0,FB05,3940,FB05,FEC0,0165

AT:U179,0183,0042,FF92,0001,00AA,00B1,0041

AT:U1A0,0000,0000,0000,0000,0000,0000,0000

AT:U1A7,0000,0000,0000,0000,0000,0000,0000

AT:U1AE,0000,0000,0000,0000,0000,0000,4000

AT:U1B5,0173,0273,045A,043B,0121,FD54,FE41

AT:U1BC,0197,0543,FD03,30D6,FD03,0543,0197

AT:U1C3,FE41,FD54,0121,043B,045A,0273,0173

Table 133. Initialization Sequence (Continued)

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

OK

Set output limiter threshold gain.

Set input limiter threshold gain.

Set AEC reference gain.

Set AEC microphone gain.

Set AEC filter length.

Set AEC adjustable delay.

Set flash hookswitch period.

Set Handset Transmit FIR coefficients.

Set Handset Receive FIR coefficients.

Set Speakerphone Transmit FIR coefficients.

Set Speakerphone Receive FIR coefficients.

AT:U72,0108

AT:U72,05D7

AT:U72,065E

OK

OK

OK

Configure Si3000 Register 1:

Disable speaker driver

Enable line output driver

Disable telephone instrument driver

Disable MBIAS output

Configure Si3000 Register 5:

20 dB Line In gain

Enable Line In

20 dB MIC input gain

Mute MIC input

Mute telephone instrument input

Enable IIR filter

Configure Si3000 Register 6:

0 dB RX PGA gain

Enable Line Out

Disable telephone instrument output

208 Rev. 1.41