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PDF OV511 Data sheet ( Hoja de datos )
| Número de pieza | OV511 | |
| Descripción | Advanced Camera to USB Bridge | |
| Fabricantes | OmniVision Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OV511 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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OV511
Advanced Camera to USB Bridge
OmniVision Technologies, Inc.
July 17, 1998
Data Sheet Rev. 1.0
OmniVision Technologies, Inc. reserves the right to make changes without further notice to any
product herein to improve reliability, function or design. OmniVision does not assume any liability
arising out of the application or use of any project, circuit described herein; neither does it
convey any license under its patent nor the right of others.
This document contains information of a proprietary nature. None of this information shall be
divulged to persons other than OmniVision Technologies, Inc. employee authorized by the nature
of their duties to receive such information, or individuals or organizations authorized by
OmniVision Technologies, Inc.
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Tables
TABLE 1. CAPABILITY OF CAMERA INTERFACE .......................................................................... 7
TABLE 2. MAXIMUM PIXEL COUNT OF ONE 256KX16 DRAM ..................................................... 7
TABLE 3. PARAMETERS OF DRAM INTERFACE TIMING.............................................................. 9
TABLE 4. PARAMETERS OF PIO TIMING....................................................................................... 13
TABLE 5. PIN DESCRIPTIONS.......................................................................................................... 16
TABLE 6. DC ELECTRICAL CHARACTERISTICS .......................................................................... 18
TABLE 7. ABSOLUTE MAXIMUM RATINGS.................................................................................. 18
TABLE 8. RECOMMENDED OPERATING CONDITIONS ............................................................... 18
TABLE 9. CAMERA INTERFACE REGISTER LIST ......................................................................... 19
TABLE 10. DRAM INTERFACE REGISTER LIST .............................................................................. 20
TABLE 11. ISO FIFO REGISTER LIST ................................................................................................ 20
TABLE 12. PIO REGISTER LIST ......................................................................................................... 21
TABLE 13. I2C REGISTER LIST .......................................................................................................... 21
TABLE 14. SYSTEM CONTROL REGISTER LIST ............................................................................. 23
TABLE 15. OMNICE REGISTER LIST ................................................................................................ 23
TABLE 16. DEVICE DESCRIPTOR LIST ............................................................................................ 25
TABLE 17. CONFIGURATION DESCRIPTOR LIST ........................................................................... 25
TABLE 18. INTERFACE DESCRIPTOR LIST OF ALTERNATE 0 ..................................................... 26
TABLE 19. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 0, PACKET SIZE 992....................... 26
TABLE 20. INTERFACE DESCRIPTOR LIST OF ALTERNATE 1 ..................................................... 26
TABLE 21. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 1, PACKET SIZE 993....................... 26
TABLE 22. INTERFACE DESCRIPTOR LIST OF ALTERNATE 2 ..................................................... 26
TABLE 23. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 2, PACKET SIZE 768....................... 27
TABLE 24. INTERFACE DESCRIPTOR LIST OF ALTERNATE 3 ..................................................... 27
TABLE 25. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 3, PACKET SIZE 769....................... 27
TABLE 26. INTERFACE DESCRIPTOR LIST OF ALTERNATE 4 ..................................................... 27
TABLE 27. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 4, PACKET SIZE 512....................... 27
TABLE 28. INTERFACE DESCRIPTOR LIST OF ALTERNATE 5 ..................................................... 28
TABLE 29. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 5, PACKET SIZE 513....................... 28
TABLE 30. INTERFACE DESCRIPTOR LIST OF ALTERNATE 6 ..................................................... 28
TABLE 31. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 6, PACKET SIZE 257....................... 28
TABLE 32. INTERFACE DESCRIPTOR LIST OF ALTERNATE 7 ..................................................... 28
TABLE 33. ENDPOINT DESCRIPTOR LIST OF ALTERNATE 7, PACKET SIZE 0 .......................... 29
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The compression ratio of OmniCE varies from 4 to 7, depending on image complexity.
Parameters can be modified dynamically by the software driver to achieve the desired frame
rate. It can also be disabled and bypass uncompressed data.
Figure 9. Structure of OmniCE
Input
Predictor
Quantizer
Encoder
Output
Programmed by Host
Look-up Table
2.2.4 ISO FIFO
OV511 implements one isochronous endpoint for video data transfer. The available alternates
include packet size of 0, 257, 512, 513, 768, 769, 992 & 993. The corresponding ISO FIFO size
has to be set by the software driver right before the current alternate is set. The size of ISO FIFO
is configurable from 32 to 992 in increment of 32.
Moreover, in order to assist packet reordering in the host, a packet number inserted at the end of
each packet can be turned on. An image frame starts with the SOF packet (Start Of an image
Frame), as well as ends with the EOF packet (End Of an image Frame). The packet number
counts up from 01 to 255 and back to 01. Only the SOF packet uses the packet number 00.
SOF/EOF packets are indicated by the unique combination which the 1st to the 8th byte are all
“0”s and the 9th byte contains a non-zero header. This header contains image information, such
as the operating mode, snapshot flag & even/odd field. In the case of the EOF packet, the 10th
and 11th bytes also contain the image width and height information.
Figure 10. SOF/EOF Formats
Packet 11
993,992,768,769,385,384,257,0
Video data ......
1
SOF/EOF
1 ... 9 10~11
Tag
8"0"s
Only available for EOF
Packet number
SOF/EOF
Bit
Frame header byte, the 9th byte
76543210
7 - EOF
6 - compression enabled
5 - 422/420/400 modes
4 - 422/420/400 modes
3-1
2 - snapshot bottom on
1 - snapshot frame
0 - even/odd field
EOF 10th, 11th bytes
Hor. width Ver. width
10
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| PDF Descargar | [ Datasheet OV511.PDF ] | |
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