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USB5926C/KD 数据表(PDF) 40 Page - Microchip Technology |
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USB5926C/KD 数据表(HTML) 40 Page - Microchip Technology |
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40 / 65 page  2019 - 2021 Microchip Technology Inc. DS00003190B-page 40 USB5926C 8.7 Port Split 8.7.1 FEATURE OVERVIEW This feature allows the USB 2.0 and USB 3.2 Gen 1 PHYs associated with any downstream port to be operationally separated. The intention of this feature is to allow a system designer to connect an embedded USB 3.x device to the USB 3.2 Gen 1 PHY, while allowing the USB 2.0 PHY to be used as either a standard USB 2.0 port or with a separate embedded USB 2.0 device. This feature operates outside of the provisions of the USB specifications. Operation is intended for specialized applica- tions only. Contact your local sales representative for additional information. In order to maintain a positive end user experience, it is recommended that only permanently attached, embedded USB 3.x devices be connected to the USB 3.2 Gen 1 PHY when enabling the Port Split feature. This prevents end users from attempting to connect USB High-Speed, Full-Speed, or Low-Speed devices to an exposed USB port which only has USB 3.2 Gen 1 connections. 8.7.2 PORT SPLITTING CONFIGURATION Downstream ports 3 and 4 may be configured for Port Splitting. Port Splitting is configured via register configuration through SMBus during the hub configuration stage (SOC_CFG) or via the hub’s internal OTP memory. When Port Splitting is enabled, the existing PRT_CTLx pin associated with that port will continue to control the USB 2.0 portion of the port in an identical matter. A new pin function assigned to a GPIOx pin will be activated and configured to control the USB 3.2 Gen 1 portion of the port. This new pin is named PRTPWRx_USB3_SPLIT where x indicates the respective port. Note that overcurrent detection is not supported on the PRTPWRx_USB3_SPLIT pin. These new pins are assigned as shown in Table 8-5. FIGURE 8-13: RECOMMENDED PORT SPLITTING CONFIGURATIONS USB Power Switch EN OCS 5V USB2.0 Device USB58xx/ USB59xx PRTCTLx VBUS Embedded USB3.x Device EN PRTPWRx_USB3_SPLIT (GPIOxx) USB58xx/ USB59xx PRTCTLx Embedded USB3.x Device EN PRTPWRx_USB3_SPLIT (GPIOxx) Embedded USB2.0 Device EN |
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