SMSC USB3280 manual 35

Hi-Speed USB Device PHY with UTMI Interface

Datasheet

Figure 8.5 HS Detection Handshake Timing Behavior (HS Mode)

Table 8.7 Reset Timing Values

TIMING
PARAMETER	DESCRIPTION		VALUE
T0	HS Handshake begins. DP pull-up enabled, HS	0 (reference)
	terminations disabled.
T1	Device asserts Chirp K on the bus.	T0	< T1 < HS Reset T0 + 6.0ms
T2	Device removes Chirp K from the bus. 1 ms	T0	+ 1.0ms < T2 <
	minimum width.	HS Reset T0 + 7.0ms
T3	Downstream facing port asserts Chirp K on the	T2	< T3 < T2+100µs
	bus.
T4	Downstream facing port toggles Chirp K to Chirp J	T3	+ 40µs < T4 < T3 + 60µs
	on the bus.
T5	Downstream facing port toggles Chirp J to Chirp K	T4	+ 40µs < T5 < T4 + 60µs
	on the bus.
T6	Device detects downstream port chirp.	T6
T7	Chirp detected by the device. Device removes DP	T6	< T7 < T6 + 500µs
	pull-up and asserts HS terminations, reverts to HS
	default state and waits for end of reset.
T8	Terminate host port Chirp K-J sequence (Repeating	T9	- 500µs < T8 < T9 - 100µs
	T4 and T5)
T9	The earliest time at which host port may end reset.	HS Reset T0 + 10ms
	The latest time, at which the device may remove
	the DP pull-up and assert the HS terminations,
	reverts to HS default state.

SMSC USB3280	35	Revision 1.5 (11-15-07)
	DATASHEET