pl-2303x Prolific Technology Inc., pl-2303x Datasheet - Page 17

• Manufacturer Part Number: pl-2303x
• Description: Pl-2303x Edition Chip Rev A Usb To Serial Bridge Controller
• Manufacturer: Prolific Technology Inc.

6.6 Endpoint 3 Descriptor: Bulk Data Input Endpoint
6.7 String Descriptors
PL-2303X supports four string descriptors:
Except for Serial Number, the other three string descriptors are stored in the internal Mask ROM, i.e.
their contents are fixed. Serial Number is a special case. If the External EEPROM were not present, or
not properly programmed, then Serial Number would be hidden from the system. If the External
EEPROM is presented and properly programmed, then Serial Number will be read from the EEPROM.
The following tables demonstrate the current defined value for each descriptor:
6.7.1 String Descriptor 0 – Language ID
6.7.2 String Descriptor 1 – Manufacturer
PL-2303XA Product Datasheet
Offset
Offset
Offset
0
1
2
0
1
2
3
4
6
0
1
2
Language ID
Manufacturer
Product
Serial Number
bLength
bDescriptorType
bLANGID[0]
BLength
bDescriptorType
bSTRING
bLength
bDescriptorType
bEndpointAddress
bmAttributes
wMaxPacketSize
bInterval
Field
Field
Field
Table 6-6 Bulk Data Input Endpoint Descriptor
Table 6-7-2 String Descriptor – Manufacturer
Table 6-7-1 String Descriptor – Language ID
Word
Word
Size
Byte
Byte
Size
Byte
Byte
Byte
Byte
Byte
Size
Byte
Byte
⎯
Value
0040h
0409h
Value
Value
32h
03h
07h
05h
83h
02h
00h
04h
03h
⇒
- 17 -
Size of this descriptor (in bytes)
STRING descriptor type
English (United States)
Size of this descriptor (in bytes)
STRING descriptor type
“Prolific Technology Inc.” in UNICODE
Size of this descriptor (in bytes)
ENDPOINT descriptor type
Input endpoint
Transfer type is BULK
64 bytes
Ignored field
Description
Description
Description
ds_pl2303XA_v15F.doc
Document Version 1.5F
Revised Date:
July 4, 2006