USB2640I datasheet(25/59 Pages) MICROCHIP

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DS00001948C-page 25

USB2640i/USB2641i

Note 7-1

This value is a UNICODE UTF-16LE encoded string value that meets the USB 2.0 Specification

(Revision 2.0, 2000). Values in double quotations without this note are ASCII values.

Note 7-2

A value of “SM” will be overridden with “xD” once an xD-Picture Card has been identified.

Note 7-3

For a list of the most current 16-bit language ID’s defined by the USB-IF, please visit

http://www.unicode.org or consult The Unicode Standard, Worldwide Character Encoding, (Version

4.0), The Unicode Consortium, Addison-Wesley Publishing Company, Reading, Massachusetts.

7.3.3

EEPROM DATA DESCRIPTOR REGISTER DESCRIPTIONS

7.3.3.1

00h: USB Serial String Descriptor Length

7.3.3.2

01h: USB Serial String Descriptor Type

7.3.3.3

02h-19h: USB Serial Number Option

7.3.3.4

1Ah-1Bh: USB Vendor Identifier Option

7.3.3.5

1Ch-1Dh: USB Product Identifier Option

TABLE 7-3:

OTHER INTERNAL CONFIGURATIONS

Address

Description

Default Value

F4h

Reserved

00h

F5h

Reserved

66h

F6-FBh

Reserved

00h

FCh-FFh

NVSTORE_SIG

Non-volatile storage signature

(“ATA2”)

“ATA2”

Byte

Name

Description

USB_SER_LEN

USB serial string descriptor length as defined by Section 9.6.7 “String” of the

USB 2.0 Specification (Revision 2.0, 2000). This field is the “bLength” which

describes the size of the string descriptor (in bytes).

Byte

Name

Description

USB_SER_TYP

USB serial string descriptor type as defined by Section 9.6.7 “String” of the

USB 2.0 Specification (Revision 2.0, 2000). This field is the “bDescriptorType”

which is a constant value associated with a string descriptor type.

Byte

Name

Description

25:2

USB_SER_NUM

Maximum string length is 12 hex digits. Must be unique to each device.

Byte

Name

Description

1:0

USB_VID

This ID is unique for every vendor. The vendor ID is assigned by the USB

Implementer’s Forum.

Byte

Name

Description

1:0

USB_PID

This ID is unique for every product. The product ID is assigned by the vendor.

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