HFC-SUSB Cologne Chip AG, HFC-SUSB Datasheet - Page 18

• Manufacturer Part Number: HFC-SUSB
• Description: Isdn S/t HDLC Basic Rate Controller
• Manufacturer: Cologne Chip AG

863 C EC2
3.1.2 USB configuration data
The external EEPROM is optional. If no EEPROM is available, EE_SCL must be connected to GND.
Without EEPROM the HFC-S USB returns the configuration data from the internal ROM.
Communication class descriptors (EE_SDA='0') are stored there as well as generic descriptors
(EE_SDA='1'). The tables below show the values for both descriptor types.
DEVICE descriptor
*)
!( _V ("
Offset
10
12
14
15
16
17
All strings indices (iManufacturer, iProduct, iSerialNumber) point to the same descriptor. So always
the same string is displayed at startup.
0
1
2
4
5
6
7
8
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
bcdDevice
iManufacturer
iProduct
iSerialNumber
bNumConfigurations
Size
1
1
2
1
1
1
1
2
2
2
1
1
1
1
generic
FFh
FFh
FFh
ROM Value
2BD0h
0110h
0959h
0100h
12h
01h
08h
01h
01h
01h
01h
comm.
class
02h
00h
00h
Description
Size of this descriptor in bytes
DEVICE Descriptor Type
USB Specification Release Number in
Binary-Coded Decimal. The HFC-S USB
device and its descriptors are compliant
with the USB Specification 1.10.
Class code (assigned by the USB).
Subclass code (assigned by the USB).
Protocol code (assigned by the USB).
Maximum packet size for endpoint zero
(only 8, 16, 32, or 64 are valid)
Vendor ID (assigned by the USB for
Cologne Chip AG)
Product ID (assigned by the
manufacturer)
Device release number in binary-coded
decimal (1.0)
Index of string descriptor describing
manufacturer
Index of string descriptor describing
product
Index of string descriptor describing the
device’s serial number
Number of possible configurations
*)
*)
*)
Cologne
Chip
:e\i " !