Camera Interface
2-8 BASLER L304kc
Draft
2.5 Output Signals
The camera’s output signals include a pixel clock, video data and video data qualifiers such as
line valid and data valid. Sections 2.5.1 through 2.5.4 describe the output signals.
2.5.1 Pixel Clock
As shown in Figure 2-3 and in Table 2-3, the Camera Link pixel clock is assigned to the TxClkIn
(transmit clock) pin of the Camera Link transmitter. The pixel clock is used to time the sampling
and transmission of pixel data as shown in Figures 2-4 and 2-5. The Camera Link transmitter used
in L304
kc cameras requires pixel data to be sampled and transmitted on the rising edge of the
clock.
L304
kc cameras operate with a 30 MHz pixel clock when they are set for 3 tap output and with a
60 MHz pixel clock when they are set for 2 tap output.
2.5.2 Line Valid Bit
As shown in Figures 2-4 and 2-5, the line valid bit indicates that a valid line is being transmitted.
Pixel data is only valid when this bit is high.
2.5.3 Data Valid Bit
The data valid bit indicates that valid pixel data is being transmitted. Pixel data is only valid when
the line valid bit and the data valid bit are both high.
L
Note that the timing used for sampling the data at the Camera Link receiver in the
frame grabber varies from device to device. On some receivers, data must be sam-
pled on the rising edge of the pixel clock (receive clock) and on others, it must be
sampled on the falling edge. Also, some devices are available that allow you to se-
lect either rising edge or falling edge sampling. Please consult the data sheet for the
receiver you are using for specific timing information.
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