Intel manual Intel Confidential, S-Registers, 536EX Chipset Developer’s Manual

S-Registers

Table 26. S-Register Command Descriptions (Continued)

Command	Default			Description
		Guard Time: S12 is used to specify guard and detect times used for the Hayes and TIES
		escape sequences.
		For the Hayes Escape Sequence, S12 specifies the minimum-delay timer (or guard time) before
		and after the three escape characters that is required for the modem to detect the Hayes
S12	50	Escape Sequence.
		For TIES, S12 specifies the maximum time limit that must elapse after receiving the three
		escape characters (and no other characters) before sending an OK message to the DTE.
		Range:	0–255 (1/50 of a second)
		Default:	50 (equals 1 second)
		Bit-Mapped Options: S14 is a read-only register that indicates AT command settings.
		Bit 0		Reserved
		Bit 1	0	E0 is selected
			1*	E1 is selected
		Bit 2	0*	Q0 is selected
			1	Q1 is selected
S14	138	Bit 3	0	V0 is selected
			1*	V1 is selected
		Bit 4		Reserved
		Bit 5	0*	T (tone) dial is selected
			1	P (pulse) dial is selected
		Bit 6		Reserved
		Bit 7	0	Answer
			1*	Originate
		Modem Test Options: S16 indicates the test in progress.
		Bit 0	0*	Local analog loopback disabled
			1	Local analog loopback enabled (&T1)
		Bit 1		Reserved
S16	0	Bit 2–5		Reserved
		Bit 6	0*	Analog loopback with self-test disabled
			1	Analog loopback with self-test enabled (&T8)
		Bit 7	0*	Reserved
			1	Reserved
		Modem Test Timer: S18 specifies the length of time that the modem conducts a data mode
		(except for V.90 and V.92) loopback test using the &Tn command. After timing out, the modem
S18	0	returns to command mode. Setting S18 to ‘0’ disables the modem test timer; the loopback test
		must be terminated by issuing the appropriate escape sequence followed by an AT&T0 or ATH.
		Range:	0–255 seconds
		Default: 0 seconds
NOTE: An asterisk (*) denotes the factory-default setting.

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