MDK-ARM Keil, MDK-ARM Datasheet - Page 118

• Manufacturer Part Number: MDK-ARM
• Description: KIT REALVIEW MCU DEVELOPMENT
• Manufacturer: Keil
• Type: Compiler and IDEr

Specifications of MDK-ARM

• For Use With/related Products: ARM MCUs
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

118
Chapter 5. RL-USB Introduction
Device Descriptor
Device Descriptor
At the top of the descriptor tree is the Device Descriptor. This descriptor
At the top of the descriptor tree is the Device Descriptor. This descriptor
contains the basic information about the device. Included in this descriptor are a
contains the basic information about the device. Included in this descriptor are a
Vendor ID and a Product ID field. These are two unique numbers identifying
Vendor ID and a Product ID field. These are two unique numbers identifying
which device has been connected. The Windows operating system uses these
which device has been connected. The Windows operating system uses these
numbers to determine which device driver to load.
numbers to determine which device driver to load.
The Vendor ID number is the number assigned to each company producing USB-
The Vendor ID number is the number assigned to each company producing USB-
based devices. The USB Implementers’ Forum is responsible for administering
based devices. The USB Implementers’ Forum is responsible for administering
the assignment of Vendor IDs. You can purchase a Vendor ID from their web
the assignment of Vendor IDs. You can purchase a Vendor ID from their web
site, www.usb.org
site, www.usb.org, if you want to use the USB logo on your product. Either way
you must have a Vendor ID if you want to sell a USB product on the open
market.
The Product ID is a second 16-bit field containing a number assigned by the
manufacturer to identify a specific product. The device descriptor also contains a
maximum packet size field.