USB3450 datasheet(34/40 Pages) SMSC

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Hi-Speed USB Host or Device PHY With UTMI+ Interface

Datasheet

Revision 0.1 (05-11-05)

SMSC USB3450

DATASHEET

Figure 7.5 HS Detection Handshake Timing Behavior (HS Mode)

Table 7.7 Reset Timing Values

TIMING

PARAMETER

DESCRIPTION

VALUE

HS Handshake begins. DP pull-up enabled, HS

terminations disabled.

0 (reference)

Device asserts Chirp K on the bus.

T0 < T1 < HS Reset T0 + 6.0ms

Device removes Chirp K from the bus. 1 ms

minimum width.

T0 + 1.0ms < T2 <

HS Reset T0 + 7.0ms

Downstream facing port asserts Chirp K on the

bus.

T2 < T3 < T2+100µs

Downstream facing port toggles Chirp K to Chirp J

on the bus.

T3 + 40µs < T4 < T3 + 60µs

Downstream facing port toggles Chirp J to Chirp K

on the bus.

T4 + 40µs < T5 < T4 + 60µs

Device detects downstream port chirp.

Chirp detected by the device. Device removes DP

pull-up and asserts HS terminations, reverts to HS

default state and waits for end of reset.

T6 < T7 < T6 + 500µs

Terminate host port Chirp K-J sequence (Repeating

T4 and T5)

T9 - 500µs < T8 < T9 - 100µs

The earliest time at which host port may end reset.

The latest time, at which the device may remove

the DP pull-up and assert the HS terminations,

reverts to HS default state.

HS Reset T0 + 10ms

USB3450 データシート(PDF) 34 Page - SMSC Corporation

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