CMV2000 datasheet(24/64 Pages) AMSCO

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Reference: CMV2000-datasheet-v3.8

CMV2000 v3 Datasheet

Page 23 of 63

4.3.2 12 BIT MODE

In 12 bit mode, the analog-to-digital conversion takes 4x longer to complete. This causes the frame rate to drop to 70FPS

when 40MHz is used for CLK_IN. Due to this extra conversion time, the sensor automatically multiplexes to 4 outputs

when 12 bit is used. To simplify the figures below, the timing for only one LVDS channel is shown in every case.

4.3.2.1 4 OUTPUT CHANNELS

By default, the CMV2000 uses only 4 LVDS output channels in 12 bit mode. This means that the read-out of one row

takes (4 x 128) + (4 x 1) master clock periods.

IDLE

128

DATA_OUT

128

Row 1

Row 2

128

FIGURE 24: OUTPUT TIMING IN OF 4 CHANNEL MODE

4.3.2.2 2 OUTPUT CHANNELS

When only 2 LVDS output channels are used, the read-out of one row takes (8*128) + (8*1) master clock periods. The

maximum frame rate is reduced with a factor of 2 compared to 4-channel mode.

IDLE

128

Row 1

128

Row 2

128

FIGURE 25: OUTPUT TIMING IN 2 CHANNEL MODE

4.4 PIXEL REMAPPING

Depending on the number of output channels, the pixels are read out by different channels and come out at a different

moment in time. With the details from the next chapters, the end user is able to remap the pixel values at the output

to their correct image array location.

4.4.1 16 OUTPUTS

Figure 26 shows the location of the image pixels versus the output channel of the image sensor.

IDLE

Pixel 0 to 127

Channel 1

IDLE

Pixel 128 to 255

Channel 2

IDLE

Pixel 256 to 383

Channel 3

IDLE

Pixel 1792 to 1919

Channel 15

IDLE

Pixel 1920 to 2047

Channel 16

Row 1

Pixel 0 to 127

Row 2

Pixel 128 to 255

Pixel 256 to 383

Pixel 1792 to 1919

Pixel 1920 to 2047

FIGURE 26: PIXEL REMAPPING FOR 16 OUTPUT CHANNELS

16 bursts of 128 pixels happen in parallel on the data outputs. This means that one complete row is read out in one

burst. The amount of rows that will be read out depends on the value in the corresponding register. By default there

are 1088 rows being read out.

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