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LAN9730 データシート(PDF) 39 Page - Microchip Technology |
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LAN9730 データシート(HTML) 39 Page - Microchip Technology |
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39 / 222 page  2012-2015 Microchip Technology Inc. DS00001946A-page 39 LAN9730/LAN9730i 4.3.1.6.7 Other Speed Configuration Descriptor The fields in this descriptor are derived from Configuration Descriptor information that is stored in the EEPROM. Note 4-11 Value is loaded from EEPROM, but must be equal to the default value in order to comply with the USB 2.0 Specification and provide for normal device operation. Specification of any other value will result in unwanted behavior and untoward operation. Note 4-12 Default value is 01h in Self-Powered mode and FAh in Bus-Powered mode. 4.3.1.6.8 Device Qualifier Descriptor The fields in this descriptor are derived from Device Descriptor information that is stored in the EEPROM. TABLE 4-10: OTHER SPEED CONFIGURATION DESCRIPTOR Offset Field Size (Bytes) Default Value Loaded from EEPROM Description 00h bLength 1 09h Note 4-11 Size of descriptor in bytes (9 bytes) 01h bDescriptorType 1 07h Note 4-11 Other Speed Configuration Descrip- tor (0x07) 02h wTotalLength 2 0027h Note 4-11 Total length in bytes of data returned (39 bytes) 04h bNumInterfaces 1 01h Note 4-11 Number of interfaces 05h bConfigurationValue 1 01h Note 4-11 Value to use as an argument to select this configuration 06h iConfiguration 1 00h Yes Index of String Descriptor describing this configuration 07h bmAttributes 1 A0h Yes Bus powered and remote wakeup enabled. 08h bMaxPower 1 Note 4-12 Yes Maximum power consumption is 500 mA. Note: EEPROM values are obtained for the Configuration Descriptor at the other USB speed. I.e., if the current operating speed is FS, then the HS Configuration Descriptor values are used, and vice-versa. Note: The RMT_WKP strap affects the default value of bmAttributes. TABLE 4-11: DEVICE QUALIFIER DESCRIPTOR Offset Field Size (Bytes) Default Value Loaded from EEPROM Description 00h bLength 1 0Ah No Size of descriptor in bytes (10 bytes) 01h bDescriptorType 1 06h No Device Qualifier Descriptor (0x06) 02h bcdUSB 2 0200h Note 4-13 USB Specification Number which device complies to. 04h bDeviceClass 1 FFh Yes Class Code 05h bDeviceSubClass 1 00h Yes Subclass Code 06h bDeviceProtocol 1 FFh Yes Protocol Code 07h bMaxPacketSize0 1 40h Note 4-13 Maximum packet size 08h bNumConfigurations 1 01h Note 4-13 Number of Other Speed Configura- tions 09h Reserved 1 00h No Must be zero |
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