Usb Descriptor Information; Device Descriptor (All Speeds) - Renesas mPD720231 User Manual

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PD720231

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