CMV300 datasheet(23/56 Pages) AMSOSRAM

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Reference:CMV300-datasheet-v2.11

CMV300 Datasheet

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4.1.2 LVDS READOUT TIMING

The readout of image data is grouped in bursts of 324 pixels per channel (2 rows at the same time). Each pixel is 12 bits

of data (see section 4.1.1). One complete pixel period equals one period of the master clock input. For details on pixel

remapping and pixel vs channel location please see section 4.1.3 of this document. An overhead time exists between

two bursts of 324 pixels. This overhead time has the length of one pixel read-out (i.e. the length of 12 bits at the selected

data rate) or one master clock cycle.

4.1.2.1 4 OUTPUT CHANNELS

By default, all 4 data output channels are used to transmit the image data. This means that two entire rows of image

data are transferred in one slot of 324 pixel periods (4 x 324 = 1296). Next figure shows the timing for the top and

bottom LVDS channels.

IDLE

324

DATA_OUT_TOP

324

Row 1

Row 3

Row 5

IDLE

324

DATA_OUT_BOTTOM

324

Row 2

Row 4

Row 6

FIGURE 17: OUTPUT TIMING IN DEFAULT 4 CHANNEL MODE

Only when 4 data outputs, running at 300Mbps, are used, the frame rate of 300fps can be achieved (default).

4.1.2.2 2 OUTPUT CHANNELS

The CMV300 has the possibility to use only 2 LVDS output channels. This setting can be programmed in the register with

address 57 (see section 5.7). In such multiplexed output mode, only the 2 bottom LVDS channels are used (channel 1

and channel 2). The readout of one row takes 1*324 periods. Next figure shows the timing for the bottom LVDS channels.

IDLE

324

Row 1

Row 2

Row 3

DATA_OUT_BOTTOM

FIGURE 18: OUTPUT TIMING IN 2 CHANNEL MODE

In this 2 channel mode, the frame rate is reduced with a factor of 2 compared to 4 channel mode.

4.1.2.3 1 OUTPUT CHANNEL

The CMV300 has also the possibility to use only 1 LVDS output channel. This setting can be programmed in the register

with address 57 (see section 5.7). In such multiplexed output mode, only 1 of the bottom 2 LVDS channels is used

(channel 1) and the readout of one row takes 2*324 periods.

IDLE

324

Row 1

Row 2

DATA_OUT_BOTTOM

324

FIGURE 19: OUTPUT TIMING IN OF 1 CHANNEL MODE

In this 1 channel mode, the frame rate is reduced with a factor of 4 compared to 4 channel mode.

4.1.3 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 sections, the end user is able to remap the pixel values at the output to

their correct image array location.

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