VV0670P001 View Datasheet(PDF) - Vision
Part Name
Description
MFG CO.
'VV0670P001' PDF : 36 Pages View PDF
Colour Processor Interface ASIC
Descriptor Field
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
bcdDevice
iManufacturer
iProduct
iSerialNumber
bNumConfigurations
Size
(bytes)
Value
2
0x0100
1
0x00
1
0x00
1
0x00
1
0x08
2
0x0553
2
0x0002 (1)
2
0x0100
1
0x00 (2)
1
0x00 (2)
1
0x00 (2)
1
0x01
Description
USB Specification Release Number identifying the
release of the USB Specification that the device and its
descriptors are compliant with. (Release 1.00)
Class Code (assigned by USB). This field is set to 0x00
meaning that the class information is specified in the
Interface descriptor.
Subclass Code (assigned by USB).
Protocol Code (assigned by USB). This field is set to
0x00, meaning that the device does not use class spe-
cific protocols on a device basis, however may use
class specific protocols on an interface basis.
Maximum packet size for Endpoint 0.
Vendor ID (assigned by USB).
Product ID (assigned by the manufacturer).
Device release number in binary-coded decimal.
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
Notes:
(1) The CPiA device returns a Product ID as part of its DEVICE descriptor. This Product ID is used along with
the Vendor ID to load the approriate device drivers for the CPiA-based USB camera. The device can return
two possible Product ID numbers depending on the state of the ID_SELECT pin. This pin has an internal pull-
up resistor which, when not connected, provides a Product ID of 0x0002 for a USB-only CPiA-based camera
module. When the ID_SELECT pin is pulled low externally, the Product ID will be 0x0001, which is used for a
combined parallel port and USB module.
(2) The USB camera does not support String Descriptors. Any request by the host for a STRING descriptor
will cause the camera to STALL the default pipe.
Finally the host issues a GetDescriptor (CONFIGURATION) command (SETUP Packet 80 06 xx 02 00 00 FF
00). CPiA has only one Configuration (index xx = 00). If xx is anything other than 00 CPiA will STALL the
default pipe. In response to the GetDescriptor (CONFIGURATION) command the camera returns its
Configuration, Interface and Endpoint descriptors which comprise 73 bytes of information.
The tables below show the descriptor information returned by a CPiA-based USB camera in response to the
GetDescriptor (CONFIGURATION) command. This information can be checked at device enumeration time
using a USB bus analyser such as the CATC Inspector when debugging a CPiA-based USB camera design.
Descriptor Field
bLength
bDescriptorType
Size
(bytes)
Value
1
0x09
1
0x02
Description
Size of this descriptor in bytes.
CONFIGURATION Descriptor Type.
V:\apps\cpia\docs\cpia datasheet\cpia_datasheet4.fm
02/07/98
18
Commercial In Confidence
Share Link: 
