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AT43USB355 数据表(PDF) 97 Page - ATMEL Corporation |
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AT43USB355 数据表(HTML) 97 Page - ATMEL Corporation |
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97 / 115 page  97 AT43USB355 2603G–USB–04/06 Hub Port Status Change Register – PSCR1..3 The microcontroller firmware uses the bits in this register to monitor when a port status change has occurred, which then gets reported to the host through the Port Change Field wPortChange. Except for bit 3, the Port Overcurrent Indicator Change, the bits in this register are set by the USB hardware. Otherwise, the firmware should only clear these bits. • Bit 7..5 – Reserved These bits are reserved in the AT43USB355 and will read as zero. • Bit 4 – RSTSC: Port Reset Status Change 0 = No change 1 = Reset complete This bit is set by the USB hardware after it completes RESET signaling which is initiated when the Reset and Enable Port command is detected at the Port Control Register, HPCON. The firmware sends this command when it decodes a SetPortFeature(PORT_RESET) request from the host. At EOF2 after the hardware completes the port reset, the hardware sets the Port Enable Sta- tus bit and clears the Port Reset Status bit of the Hub Port Status Register, HPSTAT. Cleared by firmware, ClearPortFeature(PORT_RESET). • Bit 3 – POCIC: Port Overcurrent Indicator Change 0 = No change has occurred on Overcurrent Indicator 1 = Overcurrent Indicator has changed This bit is relevant to hubs with individual overcurrent reporting only. The firmware sets this bit as a result of detecting overcurrent at the ports OVC# pin. The firmware clears bit through ClearPortFeature(PORT_OVER_CURRENT). For Port 1, this bit is always cleared. • Bit 2 – PSSC: Port Suspend Status Change 0 = No change 1 = Resume completed Port 2, 3 set by hardware upon completion of firmware initiated resume process. Port 1 set by firmware 20 ms after the next EOF2 after completion of resume process. RESUME signaling is initiated through global resume, selective resume and remote wakeup. Cleared by firmware via host request ClearPortFeature(PORT_SUSPEND). • Bit 1 – PESC: Port Enable/Disable Status Change 0 = No change has occurred on Port Enable/Disable Status 1 = Port Enable/Disable status has changed Bit 7 6 543 2 1 0 Port1 $1FB0 – – – RSTSC POCIC PSSC PESC PCSC PSCR1 Port2 $1FB1 – – – RSTSC POCIC PSSC PESC PCSC PSCR2 Port3 $1FB2 – – – RSTSC POCIC PSSC PESC PCSC PSCR3 Read/Write R R R R R R R R Initial Value 0 0 0 0 0 0 0 0 |
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