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Window Identification
Similar to 10-bit operation mode, the frame
synchronization codes are followed by a window
identification. The window ID is located in bits 6:2 (all other
bit positions are ‘0’). The same restriction for overlapping
Data Classification Codes
BL, IMG, CRC, and TR codes are defined by the same
registers as in 10-bit mode. Bits 9:2 of the respective
configuration registers are used as classification code. The
default values are listed in Table 30.
windows applies in 8-bit mode.
Table 30. SYNCHRONIZATION CHANNEL DEFAULT IDENTIFICATION CODE VALUES FOR 8-BIT MODE
Sync Word Bit
Register
Default
Position
7:0
7:0
7:0
7:0
Address
132 [9:2]
133 [9:2]
134 [9:2]
135 [9:2]
Value
0x05
0x0D
0x16
0xE9
Description
Black pixel data (BL). This data is not part of the image. The black pixel data is used in-
ternally to correct channel offsets.
Valid pixel data (IMG). The data on the data output channels is valid pixel data (part of
the image).
CRC value. The data on the data output channels is the CRC code of the finished image
data line.
Training Pattern (TR). The sync channel sends out the training pattern which can be pro-
grammed by a register setting.
Training Patterns on Data Channels
In 10-bit mode, 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 31. In 8-bit mode, the training pattern for the
data channels is defined by the same register as in 8-bit
mode, where the lower two bits are omitted; see Table 32.
Table 31. TRAINING CODE ON SYNC CHANNEL IN 10-BIT MODE
Sync Word Bit
Register
Default
Position
[9:0]
Address
130 [9:0]
Value
0x3A6
Description
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.
Table 32. TRAINING PATTERN ON DATA CHANNEL IN 8-BIT MODE
Data Word Bit
Register
Default
Position
[7:0]
Address
130 [9:2]
Value
0xE9
Description
Data Channel Training Pattern (Training pattern).
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 in 10-bit operation mode is
x 10 +x 9 +x 6 +x 3 +x 2 +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’.
In 8-bit mode, the plynomial is x 8 +x 6 +x 3 +x 2 +1. The CRC
seed is configured by means of the crc_seed register.
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 rolling
shutter mode, it is equal to the line length configured in the
active window. For global shutter mode, the sensor always
reads out the entire line (80 kernels), 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. In 8-bit mode, the configuration of
the black level calibration block automatically scales to 8-bit
mode. No reconfiguration is required.
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