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USB3803 Datasheet(PDF) 59 Page - Microchip Technology |
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USB3803 Datasheet(HTML) 59 Page - Microchip Technology |
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59 / 99 page  2014-2015 Microchip Technology Inc. DS00001691B-page 59 USB3803 7.4.7 INTERFACE DESCRIPTOR (FULL-SPEED) The following table provides interface description values for Full-Speed operation. 7 Attributes 1 user/ signal Configuration characteristics: Communicates the capabilities 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 asso- ciated with the hub (including an attached “embedded” periph- eral 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) are used to determine 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 7-21: 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 7-20: OTHER-SPEED CONFIGURATION DESCRIPTOR (FULL-SPEED) (CONTINUED) Offset Field Size Value Description |
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