Renesas mPD720231, Руководство пользователя

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μ
PD720231 4. USB Descriptor Information
R19UH0094EJ0100 Rev 1.00 Page 10 of 30
Mar 1, 2013
4.
USB Descriptor Information
This chapter describes the USB descriptors used in this device.
4.1
Device Descriptor (All speeds)
A device descriptor describes general information about a USB device. It includes information that applies
globally to the device and the device’s configuration.
Offset Field Size Value Description
0 bLength 1 12h Size of descriptor
1 bDescriptorType 1 01h Device descriptor type
2 bcdUSB 2 0300h or
0210h
USB specification version number (BCD)
0300h: Super-speed
0210h: High-/Full-speed
4 bDeviceClass 1 00h Class Code
5 bDeviceSubClass 1 00h SubClass Code
6 bDeviceProtocol 1 00h Protocol Code
7 bMaxPacketSize0 1 09h or 40h Maximum packet size for this speed.
09h: 512 bytes for Super-speed.
40h: 64 bytes for High/Full-speed
8 idVender 2 045Bh Vender ID of Renesas Electronics
10 idProduct 2 021Fh/
0220h
μ
PD720231’s product ID
021Fh: UASP support
0220h: Bulk Only support
12 bcdDevice 2 0100h Device release number (BCD)
14 iManufacturer 1 01h Index of string descriptor describing manufacturer
15 iProduct 1 02h Index of string descriptor describing product
16 iSerialNumber 1 03h Index of string descriptor describing device’s serial
number.
17 bNumConfigurations 1 01h Number of possible configuration
Remarks 1. The value of idVender, idProduct, and bcdDevice are loaded from the serial ROM or SATA
device.
2.
The value of iManufacturer, iProduct, and iSerialNumber are defined by data in the serial
ROM or SATA device.