USB3450 datasheet(25/39 Pages) MICROCHIP

部件名	USB3450

功能描述	Hi-Speed USB Host or Device PHY With UTMI Interface

PDF	39 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

25 / 39 page

 2005 - 2016 Microchip Technology Inc.

DS00002105A-page 25

USB3450

FIGURE 6-3:

HS DETECTION HANDSHAKE TIMING BEHAVIOR (FS MODE)

TABLE 6-6:

HS DETECTION HANDSHAKE TIMING VALUES (FS MODE)

Timing

Parameter

Description

Value

HS Handshake begins. DP pull-up enabled, HS

terminations disabled.

0 (reference)

Device enables HS Transceiver and asserts Chirp K

on the bus.

T0 < T1 < HS Reset T0 + 6.0ms

Device removes Chirp K from the bus. 1ms

minimum width.

T1 + 1.0 ms < T2 <

HS Reset T0 + 7.0ms

Earliest time when downstream facing port may

assert Chirp KJ sequence on the bus.

T2 < T3 < T2+100µs

Chirp not detected by the device. Device reverts to

FS default state and waits for end of reset.

T2 + 1.0ms < T4 <

T2 + 2.5ms

Earliest time at which host port may end reset

HS Reset T0 + 10ms

Note:

• T0 may occur to 4ms after HS Reset T0.

• The Link must assert the Chirp K for 66000 CLKOUT cycles to ensure a 1ms minimum duration.

USB3450 数据表(PDF) 25 Page - Microchip Technology