Specification
NET2272 USB Peripheral Controller
______________________________________________________________________________
NetChip Technology, Inc., 2003
Patent Pending
335 Pioneer Way, Mountain View, California 94041
TEL (650) 526-1490
FAX (650) 526-1494
http://www.netchip.com
Rev 1.2, October 15, 2003
91
10.4.4 USB Port AC/DC Specification Notes
1.
Measured at A plug.
2.
Measured at A receptacle.
3.
Measured at B receptacle.
4.
Measured at A or B connector.
5.
Measured with RL of 1.425K
Ω to 3.6V.
6.
Measured with RL of 14.25K
Ω to GND.
7.
Timing difference between the differential data signals.
8.
Measured at crossover point of differential data signals.
9.
The maximum load specification is the maximum effective capacitive load allowed that meets the target hub
VBUS droop of 330 mV.
10. Excluding the first transition from the Idle state.
11. The two transitions should be a (nominal) bit time apart.
12. For both transitions of differential signaling.
13. Must accept as valid EOP.
14. Single-ended capacitance of D+ or D- is the capacitance of D+/D- to all other conductors and, if present, shield
in the cable. That is, to measure the single-ended capacitance of D+, short D-, VBUS, GND, and the shield line
together and measure the capacitance of D+ to the other conductors.
15. For high power devices (non-hubs) when enabled for remote wakeup.
16. Measured from 10% to 90% of the data signal.
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