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USB7002/KDX 数据表(PDF) 37 Page - Microchip Technology |
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USB7002/KDX 数据表(HTML) 37 Page - Microchip Technology |
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37 / 56 page  2022 Microchip Technology Inc. and its subsidiaries DS00002670G-page 37 USB7002 Commands may be sent from the USB Host to the internal Hub Feature Controller device in the Microchip hub to per- form the following functions: •Configure I2C Pass-Through Interface •I2C Write •I2C Read For detailed information on utilizing the USB to I2C bridging feature, refer to the application note “USB to I2C Bridging with Microchip USB7002 and USB705x Hubs ”, which can be found on the Microchip USB7002 product page at www.microchip.com/USB7002. 8.7 USB to SPI Bridging The USB to SPI bridging feature provides system designers expanded system control and potential BOM reduction. The use of a separate USB to SPI device is no longer required and a downstream USB port is not lost, as occurs when a standalone USB to SPI device is implemented. Commands may be sent from the USB Host to the internal Hub Feature Controller device in the Microchip hub to per- form the following functions: • Enable SPI Pass-Through Interface • SPI Write/Read • Disable SPI Pass-Through Interface For detailed information on utilizing the USB to SPI bridging feature, refer to the application note “USB to SPI Bridging with Microchip USB7002 and USB705x Hubs ”, which can be found on the Microchip USB7002 product page at www.microchip.com/USB7002. 8.8 USB to UART Bridging The USB to UART bridging feature provides system designers with expanded system control and potential BOM reduc- tion. When using Microchip’s USB hubs, a separate USB to UART device is no longer required and a downstream USB port is not lost, as occurs when a standalone USB to UART device is implemented. Commands may be sent from the USB Host to the internal Hub Feature Controller device in the Microchip hub to per- form the following functions: • Enable/Disable UART Interface • Set UART Interface Baud Rate •UART Write •UART Read For detailed information on utilizing the USB to UART bridging feature, refer to the application note “USB to UART Bridg- ing with Microchip USB7002 and USB705x Hubs ”, which can be found on the Microchip USB7002 product page at www.microchip.com/USB7002. 8.9 Link Power Management (LPM) The device supports the L0 (On), L1 (Sleep), and L2 (Suspend) link power management states. These supported LPM states offer low transitional latencies in the tens of microseconds versus the much longer latencies of the traditional USB suspend/resume in the tens of milliseconds. The supported LPM states are detailed in Table 8-1. TABLE 8-1: LPM STATE DEFINITIONS State Description Entry/Exit Time to L0 L2 Suspend Entry: ~3 ms Exit: ~2 ms (from start of RESUME) L1 Sleep Entry: <10 us Exit: <50 us L0 Fully Enabled (On) - |
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