USB3250 datasheet(39/48 Pages) SMSC

39 / 48 page

USB2.0 PHY IC

Datasheet

SMSC GT3200, SMSC USB3250

Revision 1.5 (03-24-06)

DATASHEET

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

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

T6 T7

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