CMV2000 datasheet(62/87 Pages) AMSOSRAM

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CMV2000

Functional description

Datasheet

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7.5

Configuring output data format

7.5.1

Output modes

The number of LVDS channels can be selected by programming the appropriate sequencer

chapter 7.3 of this document.

Table 24: Different output modes register settings

Default value

Description of the value

Output_mode

72[1:0]

0: 16 outputs

1: 8 outputs

2: 4 outputs

3: 2 outputs

7.5.2

Training patterns

To synchronize the receiving side with the LVDS outputs of the CMV2000, a known data

pattern can be put on the output channels. This pattern can be used to “train” the LVDS

receiver of the surrounding system to achieve correct word alignment of the image data. Such

a training pattern is put on all 16 data channel outputs when there is no valid image data to be

sent (so, also in between bursts of 128 pixels). The training pattern is a 10-bit or 12-bit data

word that replaces the pixel data. The sensor has a 12-bit sequencer register (address 78-79)

that can be loaded through the SPI 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 55 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.

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