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USB3803 Datasheet(PDF) 53 Page - Microchip Technology |
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USB3803 Datasheet(HTML) 53 Page - Microchip Technology |
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53 / 99 page  2014-2015 Microchip Technology Inc. DS00001691B-page 53 USB3803 7.3.7 INTERFACE DESCRIPTOR (SINGLE-TT) The following table provides the interface descriptor values for Single-TT, High-Speed operation. 7 Attributes 1 user/ signal Configuration characteristics: Communicates the capa- bilities of the hub regarding Remote Wake-up capability, and also reports the self-power status. In all cases, the value reported to the host always indicates that the hub supports Remote Wakeup. The value reported to the host is dependant upon the SELF_BUS_PWR bit (CONFIG_BYTE_1) = A0h for Bus-Powered (SELF_BUS_PWR = 0). = E0h for Self-Powered (SELF_BUS_PWR = 1). All other values are reserved. 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 7-11: INTERFACE DESCRIPTOR (HIGH-SPEED, SINGLE-TT) 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. TABLE 7-10: OTHER-SPEED CONFIGURATION DESCRIPTOR (HIGH-SPEED) (CONTINUED) Offset Field Size Value Description |
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