PYTHON25K Datasheet, PDF (49/87 Pages) ON Semiconductor – PYTHON 25K/16K/12K/10K Global Shutter CMOS Image Sensors

NOIP1SN025KA, NOIP1SN016KA, NOIP1SN012KA, NOIP1SN010KA
adc_db_data_0
adc_db_data_1
tes tpattern_er
prbs _en
training pattern
(testpattern_en and not frame_testpattern)
in se rt CRC
bypass
Black  Lev el
Ca lib ration
Black  Lev el
Ca lib ration
Test Pattern
Generation
PRBS
Generator
CRC
Calculation
`0 '
`1'
`0 '
`1 '
`1 '
`1 '
`0'
`1 '
`0 '
`0 '
Figure 48. Functional Block Diagrams for the Data Channels
NOTE: In the figure, register configurations are
indicated in red.
The sync channel continues to send regular frame timing
information when the sequencer is enabled (independently
of the test pattern configurations).
The synthesized test patterns are injected directly into the
data channels. Therefore, no data demultiplexing is required
at the receiving end (as opposed to regular image data
capture).
Fixed Pattern
A configured word can be continuously repeated on the
output. This word is configurable for each data channel
separately (testpattern). The testpattern is inserted when
testpattern_en is asserted.
Incrementing Test Pattern
In each cycle, the test pattern word is incremented by one,
when inc_testpattern is asserted. After reaching the
maximum value, the incrementer is reset to its start value
(testpattern). When the testdata is framed, the incrementer
is also reset to the testpattern value at each line start.
To enable this mode, enable the digital testpattern mode
(assert testpattern_en) and assert inc_testpattern.
Pseudo Random Bit Sequence Generation
In this test mode, the output channels are sourced with
pseudo random bit sequence (PRBS) pattern. The PRBS
seed can be configured for each data channel using the
testpattern register. For the other test pattern generation
mode, the datastream is not interrupted when
frame_testpattern is deasserted.
NOTES:
• The CRC generator is not functional in this mode, and
no real CRC can be calculated. Instead, the CRC slot is
used to send one more PRBS word.
• A PRBS generator does not generate random data when
the seed is all zero. Therefore, it is advisable to
configure the testpattern registers to a value different
from ‘0’. Using different seeds for each channel results
in different sequences for each data channel.
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