TC5747 Datasheet, PDF (28/44 Pages) List of Unclassifed Manufacturers – Single Chip CMOS Imager with Integrated Image Signal Processor and JPEG Codec

TC5747 Data Sheet
Single Chip CMOS Imager
4.2.6.5 RGB666 Output
When RGB666 output is selected, the data volume is two 9-bit “ words” per pixel. Two modes can be selected
for RGB666 data.
Two-transfers Mode
When RGB666 output is selected, the data volume is two 9-bit “ words” per pixel. No extra pixels are
required beyond the VGA/QVGA size.
The output data is transmitted in the same manner and frequency as the YCrCb 4:2:2 output format, on
DOUT[9:1]. The first byte of each pixel carries 6 bits of the Red color component, and the 3 MSB of the
Green. The second byte carries the 3 LSB of the Green color component, and the 6 bits of the Blue color
component.
Three-transfers Mode
When three-transfer RGB666 output is selected, the data volume is three 6-bit “ words” per pixel. No extra
pixels are required beyond the VGA/QVGA size.
The output data is transmitted on DOUT[9:4]. The order of transmission is Red, Green and Blue.
Figure 17: RGB666 Three-transfers Mode
The output data is transmitted in the double the frequency as the YCrCb 4:2:2 output format, 3 consecutive
clock cycles carry valid data, and the fourth clock cycle is skipped. No valid data is active on this clock
cycle, and VALIDH is inactive.
4.2.6.6 RGB444 Output
When RGB444 output is selected, the data volume is two bytes per pixel. The output data is transmitted in
the same manner and frequency as the YCrCb 4:2:2 output format, on DOUT[9:2]. The first byte of each pixel
carries 4 bits of the Red color component, and the 4 bits of the Green. The second byte carries the 4 bits of
the Blue color component on DOUT[9:6], and is padded by 6 zeros on DOUT[5:0].
4.2.6.7 JPEG Output
When JPEG output is selected, the compressed code is sent out on the parallel data bus, qualified by VALIDH.
To support ancillary data format as defined in the ITU 656 and ITU 1364 standards, an optional ancillary data
packet header may be added before each consecutive packet of bytes of JPEG code. A Checksum byte may
be added following the data bytes. The last “ packet” of JPEG code may contain less than packet number of
bytes, and the “ payload byte” in the packet header reflects the actual size.
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