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USB2514 데이터시트(PDF) 45 Page - Microchip Technology |
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USB2514 데이터시트(HTML) 45 Page - Microchip Technology |
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45 / 63 page ![]() USB 2.0 Hi-Speed Hub Controller Datasheet SMSC USB251xB/xBi 45 Revision 2.2 (02-17-12) DATASHEET 5.5.1.1 RESET_N for Strapping Option Configuration Figure 5.3 Reset_N Timing for Default Configuration Notes: When in bus-powered mode, the hub and its associated circuitry must not consume more than 100 mA from the upstream USB power source during t1+t5. All power supplies must have reached the operating levels mandated in Chapter 6: DC Parameters, prior to (or coincident with) the assertion of RESET_N. NAME DESCRIPTION MIN TYP MAX UNITS t1 RESET_N asserted 1 μs t2 CFG_SEL[1:0] setup time 16.7 ns t3 CFG_SEL[1:0] hold time 16.7 1400 ns t4 Hub outputs driven to inactive logic states 1.5 2 μs t5 USB attach (see notes) 100 ms t6 Host acknowledges attach and signals USB reset 100 ms t7 USB idle undefined ms t8 Completion time for requests (with or without data stage) 5msec t1 t4 t5 t6 t7 t8 valid driven by hub if strap is an output RESET_N VSS CFG_SEL[2:0] VSS Hardware reset asserted Read CFG_SEL[1:0] Drive strap outputs to inactive levels Attach USB upstream USB reset recovery Idle Start completion request response t2 t3 don’t care don’t care |
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