SMSC USB2502 5.6.1.2RESET_N for EEPROM Configuration

2-Port USB 2.0 Hub Controller

Datasheet

Table 5.5 Reset_N Timing for Default/Strap Option Mode (continued)

NAME	DESCRIPTION	MIN	TYP	MAX	UNITS
t6	Host acknowledges attach and signals USB	100			msec
	Reset.
t7	USB Idle.		undefined		msec
t8	Completion time for requests (with or without data			5	msec
	stage).

Notes:

„When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than 100mA from the upstream USB power source during t1+t5.

„All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC Parameters", prior to (or coincident with) the assertion of RESET_N.

5.6.1.2RESET_N for EEPROM Configuration

Hardware		Read EEPROM	Attach			Start
	Read Strap			USB Reset		completion
reset		+	USB		Idle
	Options			recovery		request
asserted		Set Options	Upstream
						response

		t4
t1	t2	t3	t5	t6	t7

RESET_N

VSS

Figure 5.3 Reset_N Timing for EEPROM Mode

Table 5.6 Reset_N Timing for EEPROM Mode

NAME	DESCRIPTION	MIN	TYP	MAX	UNITS
t1	RESET_N Asserted.	1			μsec
t2	Hub Recovery/Stabilization.			500	μsec
t3	EEPROM Read / Hub Config.		2.0	99.5	msec
t4	USB Attach (See Note).			100	msec
t5	Host acknowledges attach and signals USB	100			msec
	Reset.
t6	USB Idle.		undefined		msec
t7	Completion time for requests (with or without data			5	msec
	stage).

Notes:

„When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than 100mA from the upstream USB power source during t4+t5+t6+t7.

Revision 2.3 (08-27-07)	34	SMSC USB2502
	DATASHEET