USB2.0 PHY IC
T5
T0
T1
T2
T4
T8
T6 T7
T9
time
T3
OPMODE 0
OPMODE 1
XCVRSELECT
TERMSELECT
TXVALID
DP/DM
Device
Chirp K
K
J
K
J
K
J
K
J
SE0 SOF
Downstream Facing
Port Chirps
Device
Port
Chirp
HS Mode
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
terminations disabled.
0 (reference)
T1
T2
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
T3
T4
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
T5
Downstream facing port toggles Chirp J to Chirp K on
the bus.
T4 + 40µs < T5 < T4 + 60µs
T6
T7
Device detects downstream port chirp.
T6
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
T8
Terminate host port Chirp K-J sequence (Repeating
T4 and T5)
T9 - 500µs < T8 < T9 - 100µs
SMSC GT3200, SMSC USB3250
Revision 1.3 (10-05-04)
DATA3S4HEET
SMSC [ SMSC CORPORATION ]
