USB3250 datasheet(34/46 Pages) MICROCHIP

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USB3250

DS00002142A-page 34

 2013 - 2016 Microchip Technology Inc.

Note 8-3

T0 may be up to 4ms after HS Reset T0.

Note 8-4

The SIE must use LINESTATE to detect the downstream port chirp sequence.

FIGURE 8-5:

HS DETECTION HANDSHAKE TIMING BEHAVIOR (HS MODE)

TABLE 8-7:

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

TXVALID

Downstream Facing

Port Chirps

Device

Chirp K

TERMSELECT

DP/DM

Device

Port

Chirp

SE0

SOF

XCVRSELECT

HS Mode

OPMODE 1

OPMODE 0

time

T4 T5

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