USB3250 datasheet(41/48 Pages) SMSC

41 / 48 page

USB2.0 PHY IC

Datasheet

SMSC GT3200, SMSC USB3250

Revision 1.5 (03-24-06)

DATASHEET

To detect the assertion of the downstream Chirp K's and Chirp J's for 2.5us {TFILT}, the SIE must see

the appropriate LINESTATE signals asserted continuously for 165 CLK60 cycles.

Figure 8.6 HS Detection Handshake Timing Behavior from Suspend

Table 8.8 HS Detection Handshake Timing Values from Suspend

TIMING

PARAMETER

DESCRIPTION

VALUE

While in suspend state an SE0 is detected on the

USB. HS Handshake begins. D+ pull-up enabled, HS

terminations disabled, SUSPENDN negated.

0 (HS Reset T0)

First transition of CLKOUT. CLKOUT "Usable"

(frequency accurate to ±10%, duty cycle accurate to

50±5).

T0 < T1 < T0 + 5.6ms

Device asserts Chirp K on the bus.

T1 < T2 < T0 + 5.8ms

Device removes Chirp K from the bus. (1 ms

minimum width) and begins looking for host chirps.

T2 + 1.0 ms < T3 < T0 + 7.0 ms

CLK "Nominal" (CLKOUT is frequency accurate to

±500 ppm, duty cycle accurate to 50±5).

T1 < T3 < T0 + 20.0ms

CLK60

Look for host chirps

Device Chirp K

SUSPENDN

DP/DM

TERMSELECT

TXVALID

SE0

CLK power up time

XCVRSELECT

OPMODE 1

OPMODE 0

time

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