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USB3803 Datasheet(PDF) 48 Page - Microchip Technology |
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USB3803 Datasheet(HTML) 48 Page - Microchip Technology |
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48 / 99 page  USB3803 DS00001691B-page 48 2014-2015 Microchip Technology Inc. 7.2.3 INTERFACE DESCRIPTOR (FULL-SPEED) The following table provides the interface descriptor values for Full-Speed operation. 8 MaxPower 1 user Maximum Power Consumption of the Hub from VBUS when fully operational. This value includes all support circuitry associated with the hub (including an attached “embedded” peripheral if hub is part of a compound device), and is in 2mA increments. The Hub supports Self-Powered and Bus-Powered operation. The SELF- _BUS_PWR bit (CONFIG_BYTE_1) is used to deter- mine which of the values below are reported. The value reported to the host must coincide with the current oper- ating mode, and will be determined by the following rules. The value that is reported to the host will be: ‘MAX_PWR_BP’ if SELF_BUS_PWR = ‘0’ ‘MAX_PWR_SP’ if SELF_BUS_PWR = ‘1’ In all cases the reported value is sourced from the MAX POWER data field (for Self or Bus power) that was loaded by Internal Default, or serial port configuration. TABLE 7-3: INTERFACE DESCRIPTOR (FULL-SPEED) Offset Field Size Value Description 0 Length 1 09h Size of this Descriptor 1 DescriptorType 1 04h Interface Descriptor Type 2 InterfaceNumber 1 00h Number of this interface. 3 AlternateSetting 1 00h Value used to select this alternate setting for the inter- face. 4 NumEndpoints 1 01h Number of endpoints used by this interface (not includ- ing endpoint 0). 5 InterfaceClass 1 09h Hub class code. 6 InterfaceSubclass 1 00h Subclass code 7 InterfaceProtocol 1 00h Protocol code. 8 Interface 1 00h Index of the string descriptor describing this interface (strings not supported). TABLE 7-2: CONFIGURATION DESCRIPTOR (FULL-SPEED) (CONTINUED) Offset Field Size Value Description |
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