NOIP1FN016KA-GDI datasheet(49/87 Pages) ONSEMI

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Figure 48. Functional Block Diagrams for the Data Channels

(testpattern_en and not frame_testpattern)

`1'

`0'

testpattern_er

`0'

`1'

training pattern

insert CRC

`0'

`1'

bypass

prbs_en

adc_db_data_0

Black Level

Calibration

adc_db_data_1

`1'

`0'

`1'

Black Level

Calibration

Test Pattern

Generation

PRBS

Generator

CRC

Calculation

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

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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