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Configuration MC132x Users Manual Rev. 0.22

6.5.5 Tracking

For rapid window movement even at slow baud rates a short command is provided..

command: :t<n>,<m>

<m> = X-position in pixel/10,

range 00h ...07fh

<n> = Y-position in lines / 4,

range 00h ...0ffh

Response: none

6.6 Clock selection

The MC132x 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 x image frequency) and the data rate on the output.

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:

sens

<= (F

pix

• 1280) / (5 • line length)

or if 100 pixel line length is chosen:

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.

6.6.1 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 / 2).

command :S <x

> ... 6 characters, as described in chapter Frequency selection

6.6.2 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 9.4).

Example: 240 < line length <= 640 Pixel, clock selection s9

pixelclock: 30,0 MHz

sensorclock: 11,2 MHz

resulting max. datarate on the 16-Bit output:

30,0 MHz/s * 2 Byte = 60,0 Mbyte/sec.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 44 45

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