tc5747 ETC-unknow, tc5747 Datasheet - Page 29

• 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
Extra optional data markers are inserted at the beginning and end of each image line. The user may select
between TransChip-specific markers, and markers that conform to the
4.2.7.1
A “ Timing signal” or Marker is defined in the
bytes holding reserved values of
function is defined in the standard. The TransChip markers utilize the format of the markers as defined in
the standard, but redefines two bits in the last marker byte.
There are four types of markers:
All markers are 4 bytes long. The first 3 bytes of all markers are identical, and annotate the marker header.
The marker content is “
Bits [7:4] of the Marker-content byte carry the marker information:
Bits [3:0] of the Marker-content byte provide parity check capability, allowing for one-bit errors to be
corrected, and two-bit errors to be detected, according to ITU-656-4 Standard.
Start of First Line marker – This marker precedes the data of the first line in a frame.
Start of Line Marker - This marker precedes the data of each line in a frame, except for the first line.
When Bayer output mode is selected, bit #5 of the marker content differentiates between a “ red” line
and a “ blue” line (0 and 1 respectively).
End of Last Line Marker - This marker immediately follows the data of the last line in a frame.
End of Line Marker - This marker immediately follows the data of each line in a frame, except for the
last line.
Data Markers
TransChip Markers
Bit [7] – Always 1 to avoid 0x00 code
Bit [6] - Special frame markers (start-first-line/end-last-line)
Bit [5] – For Bayer – line “ color” (0 for Red, 1 for Blue)
Bit [4] – End/Start bit, 0 for Start-of-line marker, 1 for End-of-line
Marker
SOFL
SOLR
SOLB
EOLL
EOL
(
(“blue” line)
FF 00 00 xy
YCrCb
or “red” line)
” , where xy is different for each marker type.
FF 00 00
Table 4: TransChip Markers
, and the fourth byte composed of a collection of bits whose
Marker Header
0xFF
0xFF
0xFF
0xFF
0xFF
ITU 656
TransChip
0x00
0x00
0x00
0x00
0x00
23
standard as a sequence of four bytes, the first three
0x00
0x00
0x00
0x00
0x00
Marker content
DOUT[9:2] / DYUV[7:0]
0xC7
0x80
0xAB
0xDA
0x9D
ITU 656
standard.