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Configuration MC13xx Users Manual Rev. 1.08
6.7 Clock selection
The MC13xx is equipped with a 2-channel programmable clock synthesizer. One channel controls clock
frequency of the sensor (sensorclock, F
sens
), the other controls the frequency of the pixel clock (pixel-
clock, F
pix
). These independent clocks allow an always optimal ratio depending on the product of (im-
age size • image frequency) and the data rate on the output.
Example:
The MC13xx is connected to a frame grabber with a maximum data rate of 66MBytes/s via the„Base
Camera Link®“ interface using
2 x 8 bit video data.. A pixel clock of 33 MHz has to be selected.
As the sensor outputs 10 pixel per clock a sensor clock of 6.6MHz could be chosen. Because the sensor
can run up to a clock frequency of 66 MHz only 1/10 of the sensors possible speed would be used. To
make use of the maximum sensor clock and maintaining the maximum data rate on the output, just 120
(1280/10 rounded to steps of 10) from the possible 1280 pixel per line can be selected.
Therefore the ratio of F
sens
and F
pix
depends on the selected line length:
F
sens
<= (F
pix
• 1280) / (5 * line length)
or if 100 pixel line length is chosen:
F
sens
= (33 • 1280) / (5 • 100) = 70,4 MHz
As this exceeds the maximum sensor clock frequency, F
sens
is chosen as 66 MHz and F
pix
as 33 MHz.
6.7.1 Arbitrary selection of sensor and pixel clock
Sensor and pixel clock can be set to any value, the product of: (sensor clock • line length/1280) must
always be smaller (about 10%) than the qoutient: (pixel clock / video data width
, e.g.: 2, or 8).
If video data width of 10 x 8-Bit is selected, sensor clock = pixel clock.
command :S <x
0
>
<x
0
> ... 6 characters, as described in chapter Frequency selection
6.7.2 Table selection of clock frequencies
To simplify clock selection when using video data width of 2, clocks can be selected from a table with
15 entries, each entry being optimized for four regions of line length. (see table in 9.3
).
Example: 240 < line length <= 640 Pixel, clock selection s9
pixelclock: 27,5 MHz
sensorclock: 11,2 MHz
resulting max. datarate on the 16-Bit output:
27,5 MHz/s * 2 Byte = 55,0 Mbyte/sec.
18
- Table of contents 2
- 1 General 4
- 2 Introduction 7
- 2.4 Using the camera 8
- 3 Hardware 9
- 4 Getting started 10
- 5 Initial setup 11
- 6 Configuration 12
- 6.3 Profile processing 14
- 6.5 Image quality 15
- 6.6 Image size and position 16
- 6.7 Clock selection 18
- 6.8 Exposure control 19
- 6.9 Firmware 22
- 6.10 Horizontal pixelbinning 22
- 6.11 Vertical pixelbinning 22
- 6.13 Digital gain 23
- 6.14 External clock input 23
- 6.15 Polarity of EXP-signal 23
- 6.16 Test image 24
- 6.17 Image counter 24
- 7.1 Basic Configuration 29
- 8 Mechanical dimensions 31
- 8.2 Lens adjustment 33
- 9 Technical Data 34
- 9.1 Spectral response 35
- Sensitive Area 36
- 9.3 Connector pinning 37
- 9.5 Frequency selection 42
- 1280 Pixel 45
- Table 9.5-7 47
- 9.7 Timing 49
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