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USB2517 데이터시트(PDF) 45 Page - Microchip Technology |
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USB2517 데이터시트(HTML) 45 Page - Microchip Technology |
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45 / 58 page ![]() 2013-2016 Microchip Technology Inc. DS00001598B-page 45 USB2517/USB2517I 7.6.2.3 RESET_N for SMBus Slave Configuration FIGURE 7-6: RESET_N TIMING FOR SMBUS MODE TABLE 7-8: RESET_N TIMING FOR SMBUS MODE Name Description Min Typ Max Units t1 RESET_N Asserted. 1 sec t2 Hub Recovery/Stabilization. 500 sec t3 SMBus Code Load (See Note). 250 300 msec t4 Hub Configuration and USB Attach. 100 msec t5 Host acknowledges attach and signals USB Reset. 100 msec t6 USB Idle. Undefined msec t7 Completion time for requests (with or without data stage). 5 msec Note: • For Bus-Powered configurations, the 99.5ms (MAX) is required, and the Hub and its associated circuitry must not consume more than 100mA from the upstream USB power source during t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load the configuration is determined by the external SMBus host. • All Power Supplies must have reached the operating levels mandated in Section 8.0, "DC Parameters", prior to (or coincident with) the assertion of RESET_N. t1 t2 t4 t5 t6 t7 RESET_N VSS Hardware reset asserted Reset Negation SMBus Code Load Attach USB Upstream USB Reset recovery Idle Start completion request response t3 Hub PHY Stabilization |
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