Silicon Laboratories SI2493/57/34/15/04, SI2494/39 manual Initialization Sequence

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 31. After initialization, the system will be in the TAM Hands-Free mode, which is discussed in "7.3.3.1. TAM Hands-Free".

Table 119. Initialization Sequence

	Modem to
Host to Modem Commands	Host Result	Local Modem Actions
	Codes
ATZ	OK	Reset. The Si3000 is not reset by this
		command.
ATE0+FCLASS = 0	OK	Disable local AT command echo and
		enter data mode, which is necessary for
		patch loading.
AT+IPR = 115200	OK	Disable autobaud and set rate to
		115,200 bps.
[ Apply Patch Commands ]	OK	Apply the modem patch commands.
AT:U199A	OK	Mute the microphone and speaker
		paths to the codec.
		Disable local AT command echo and
ATE0+FCLASS = 8	OK	enter voice mode. Limited V.253 event
		reporting enabled with default setting of
		+VLS=0.
AT+VLS = 0	OK	Disable voice mode. Used as a transi-
		tion point between non-zero +VLS voice
		modes.
AT+VLS = 14	OK	Setup on-hook TAM voice mode. See
		Table 117 on page 190 for details.
AT*Y254:W591	OK	Enable the SSI interface to the Si3000.
AT*Y0	OK	Exit the AT*Y command mode.
AT+VCDT = 1	OK	Enable always-on Type I Caller ID.
AT+VCID = 1	OK	Enable formatted Caller ID.
AT+VSD = 129	OK	Set silence detection sensitivity level.
AT+PCW = 0	OK	Enable Type II Caller ID reporting.
AT:U0B1,0500	OK	Set Si3000-to-DAA transmit gain.
AT:U0B5,0200	OK	Set DAA-to-Si3000 receive gain.
AT:U0B6,0100	OK	Set Sidetone gain.
AT:U0B9,0300	OK	Set VTS-to-Si3000 transmit gain.
AT:U0B4,0600	OK	Set VTS-to-DAA transmit gain.

194 Rev. 1.3