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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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USB3450 датащи(PDF) 25 Page - Microchip Technology |
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USB3450 датащи(HTML) 25 Page - Microchip Technology |
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25 / 39 page  2005 - 2016 Microchip Technology Inc. DS00002105A-page 25 USB3450 FIGURE 6-3: HS DETECTION HANDSHAKE TIMING BEHAVIOR (FS MODE) TABLE 6-6: HS DETECTION HANDSHAKE TIMING VALUES (FS MODE) Timing Parameter Description Value T0 HS Handshake begins. DP pull-up enabled, HS terminations disabled. 0 (reference) T1 Device enables HS Transceiver and asserts Chirp K on the bus. T0 < T1 < HS Reset T0 + 6.0ms T2 Device removes Chirp K from the bus. 1ms minimum width. T1 + 1.0 ms < T2 < HS Reset T0 + 7.0ms T3 Earliest time when downstream facing port may assert Chirp KJ sequence on the bus. T2 < T3 < T2+100µs T4 Chirp not detected by the device. Device reverts to FS default state and waits for end of reset. T2 + 1.0ms < T4 < T2 + 2.5ms T5 Earliest time at which host port may end reset HS Reset T0 + 10ms Note: • T0 may occur to 4ms after HS Reset T0. • The Link must assert the Chirp K for 66000 CLKOUT cycles to ensure a 1ms minimum duration. |
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