CMV4000 datasheet(49/92 Pages) AMSOSRAM

49 / 92 page

CMV4000

Functional description

Datasheet

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• v8-01 • 2025-Jul-10

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7.3.6

Training data

To synchronize the receiving side with the LVDS outputs of the CMV4000, a known data

pattern can be put on the output channels. This pattern “trains” the LVDS receiver of the

surrounding system to achieve correct word alignment of the image data. This training pattern

is put on all 16 output channels when no valid image data is being sent, even in between

bursts of 128 pixels. The training pattern is a 10-bit or 12-bit word that replaces the pixel data.

The sensor has a 12-bit sequencer register (address 78-79) that can be used to change the

contents of the 12-bit training pattern.

The control channel does not send a training pattern, because it is used to send control

information at all time. Word alignment can be done on this channel when the sensor is idle

(not exposing or sending image data). In this case all bits of the control word are zero, except

for bit [9] (= 0010 0000 0000 or 512 decimal).

Figure 41 shows the location of the training pattern (TP) on the data channels when the sensor

is idle and when reading out 3 rows. The default mode of 16 outputs is selected.

Figure 41: Training pattern location in the data and control channels

Training pattern

128

Data

channels

DVAL

LVAL

FVAL

Control

channel

0010 0000 0000

Control information

Sensor in idle mode

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