tc5747 ETC-unknow, tc5747 Datasheet - Page 31

• Manufacturer Part Number: tc5747
• Description: Single Chip Cmos Imager With Integrated Image Signal Processor Jpeg Codec
• Manufacturer: ETC-unknow

TC5747 Preliminary Data Sheet
Single Chip CMOS Imager
4.2.7.3
When the Send-Markers mode is enabled, care has to be taken to avoid marker-emulation inside the data
itself.
4.2.8
The
defined in the
Immediately following a blank line “ Timing signal” , an ancillary data packet may be added. If an ancillary
data header is detected instead of the blank video data, as defined by the standard (a sequence of 0x80
0x10), ancillary data can be extracted.
An ancillary data header is defined as a sequence of 6 bytes:
0x00 0xFF 0xFF ID1 ID2 Data-SIZE/4
The header is followed by data (4 to 252 bytes).
A Check-sum byte follows the data as the last byte of the packet.
The ancillary header and checksum are optionally produced by the JPEG unit. The
between header and JPEG code.
When
the transmitted data, because the Y data values are limited to the range of 16-235, and the
data values are limited to the 16-240 range.
values.
When Bayer output is selected, the data has to be modified, so that 0xFF and
from the data content, and replaced by their nearest allowed values (0xFE and
When
and
When
and
When
and 0x00 values are removed from the data content, and replaced by their nearest allowed values.
JPEG code cannot be modified. However, there is no need for any modification if Ancillary format is
used for JPEG transmission.
ITU-1364
Ancillary Data Format
0x00
0x00
Avoiding Marker Emulation
The first byte of
The second byte of
TBD
The first byte of
The second byte of
YCrCb 4:2:2
RGB565
RGB666
RGB444
values are removed from the data content, and replaced by their nearest allowed values.
values are removed from the data content, and replaced by their nearest allowed values.
ITU 656
defines the ancillary data format that may be transmitted during blank lines of video, as
output is selected, the data has to be modified, as in the case of the Bayer output.
output is selected, the data has to be modified, as in the case of the Bayer output.
output is selected, the data has to be modified, as in the case of the Bayer output.
standard.
output mode is selected, there is no contention between marker header contents and
RGB565
RGB444
RGB565
RGB444
is replaced by
is replaced by
is replaced by
is replaced by
TransChip
0xF7
0xEF
0x00
0xFE
0xF0
25
or
or
and
0x08
0x10
or
or
0x01
0x01
0xFF
.
.
.
.
values never occur inside the image data
0x01
PVI
0x00
does not differentiate
respectively).
values are removed
Cr
and
0xFF
0xFF
0xFF
Cb