PYTHON25K Datasheet, PDF (40/87 Pages) ON Semiconductor – PYTHON 25K/16K/12K/10K Global Shutter CMOS Image Sensors

NOIP1SN025KA, NOIP1SN016KA, NOIP1SN012KA, NOIP1SN010KA
Training Patterns on Data Channels
During idle periods, the data channels transmit training
patterns, indicated on the sync channel by a TR code. These
training patterns are configurable independent of the
training code on the sync channel as shown in Table 26.
Table 26. TRAINING CODE ON SYNC CHANNEL
Sync Word Bit
Position
Register
Address
Default
Value
Description
[9:0]
116 [9:0]
0x3A6
Data channel training pattern. The data output channels send out the training pattern, which can be
programmed by a register setting. The default value of the training pattern is 0x3A6, which is identical
to the training pattern indication code on the sync channel.
Cyclic Redundancy Code
At the end of each line, a CRC code is calculated to allow
error detection at the receiving end. Each data channel
transmits a CRC code to protect the data words sent during
the previous cycles. Idle and training patterns are not
included in the calculation.
The sync channel is not protected. A special character
(CRC indication) is transmitted whenever the data channels
send their respective CRC code.
The polynomial is x¹⁰+x⁹+x⁶+x³+x²+x+1. The CRC
encoder is seeded at the start of a new line and updated for
every (valid) data word received. The CRC seed is
configurable usign the crc_seed register. When ‘0’, the CRC
is seeded by all-‘0’; when ‘1’ it is seeded with all-‘1’.
NOTE: Note The CRC is calculated for every line. This
implies that the CRC code can protect lines from
multiple windows.
Black Reference
The sensor reads out one or more black lines at the start of
every new frame. The number of black lines to be generated
is programmable and is at a minimum, equal to 1. The length
of the black lines depends on the operation mode. For global
shutter mode, the sensor always reads out the entire line,
independent of window configurations.
The black references are used to perform black calibration
and offset compensation in the data channels. The raw black
pixel data is transmitted over the usual LVDS channels,
while the regular image data is compensated (can be
bypassed).
On the output interface, black lines can be seen as a
separate window, without frame start and ends (only line
start and ends). The window ID is to be ignored and data is
indicated by a BL code.
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