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2015-09-18 发布于四川
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USB开发.ppt

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ELECTRICALSignaling and Power DistributionAndrew M. VolkIntel Corporation Agenda Signaling USB Data Signaling Reset Signaling Resume Signaling Power Distribution Power Budgets Self-powered Devices Bus-Powered Devices Objectives Reliable, Low Cost Physical Layer between Host, Hubs and Functions Data Communication Limited power distribution Dynamic attach-detach Data Signaling Bi-directional, half-duplex link Embedded clock and data Differential signal pair 12 Mbit / sec Full Speed (F.S.) bit rate 1.5 Mbit / sec Low Speed (L.S.) bit rate Signaling States J-state Idle State Differentiates full or low speed K-state (Inverse of J-state) Start of Packet identifier (SOP) Signaling auto resume from power suspend Single ended zero (SE0) state End of Packet identifier (EOP) Signaling reset Disconnected line USB Transceiver Differential Driver Slew rate controlled SE0 drive capability Differential Receiver Sensitivity 200mV Common mode range: 1.0V to 3.0V Single-Ended Receivers Threshold: 0.6V - 1.5V USB Connections and Terminations Connect / Disconnect Packet Delimiters SOP, EOP Data Encoding Full Speed 12 Mb/s Frequency Tolerance ?500ppm Shielded, twisted cable Z0 = 90 ? ?5% Driver characteristics 45 ? ?5% Rise/ Fall time: Min 4ns, Max 20ns Bus Driver Full Speed Signaling Low Speed 1.5 Mb/s Unshielded, untwisted cable Saves EMI suppression costs 1.5% Frequency tolerance Driver characteristics Rise/ Fall time: Min 75ns, Max 300ns Required on low speed functions and on the downstream ports of Hubs Low Speed Signaling Reset Signaling Signaled with a long Single-Ended Zero Reset not to be recognized until after 2.5 ?s Must be recognized by 5.5 ?s (if device active) Downstream Signaling only Sent by any downstream hub port Returns device to its default state Suspend Resume Suspend All devices support suspend Enter suspend state after seeing idle bus for 3 ms Suspend current ? 500 ?A from bus Resume Devices resume on seeing non-J state USB devices can c