Datasheet
T0 | T1 | T2 | T3 | T4 |
time
OPMODE 0
OPMODE 1
XCVRSELECT
TERMSELECT
SUSPENDN
TXVALID
CLK60
DP/DM |
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| SE0 |
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| J |
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CLK power up time | Device Chirp K | Look for host chirps |
Figure 8.6 HS Detection Handshake Timing Behavior from Suspend
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 CLKOUT cycles.
Table 8.8 HS Detection Handshake Timing Values from Suspend
TIMING |
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PARAMETER | DESCRIPTION |
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T0 | While in suspend state an SE0 is detected on the USB. HS | 0 (HS Reset T0) | ||
| Handshake begins. D+ |
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| disabled, SUSPENDN negated. |
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T1 | First transition of CLKOUT. CLKOUT "Usable" (frequency | T0 | < T1 | < T0 + 5.6ms |
| accurate to ±10%, duty cycle accurate to 50±5). |
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T2 | Device asserts Chirp K on the bus. | T1 | < T2 | < T0 + 5.8ms |
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T3 | Device removes Chirp K from the bus. (1 ms minimum width) | T2 | + 1.0 ms < T3 < | |
| and begins looking for host chirps. | T0 + 7.0 ms | ||
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T4 | CLK "Nominal" (CLKOUT is frequency accurate to ±500 | T1 | < T3 | < T0 + 20.0ms |
| ppm, duty cycle accurate to 50±5). |
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SMSC USB3280 | 37 | Revision 1.5 |
| DATASHEET |
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