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Acquisition section
55
considered high while anything less than 0.8 V is considered
low. The transition of 0.8 V to 2 V is considered to be the rising
edge.
The trigger signal's pulse width must be greater than one pixel.
You can determine the pulse width by taking the inverse of the
pixel frequency. For example, if the pixel frequency is
≈
12.27 MHz, the minimum pulse width is 1/12.27 MHz
82
nanoseconds.
Caution
The direct TTL trigger input is not protected or conditioned.
Use it with caution.
Opto-coupled trigger
Trigger signals can be received in opto-coupled format
(OPTOTRIG+ and OPTOTRIG-). The difference between
OPTOTRIG+ and OPTOTRIG- (pins 35 and 34 on the video
input connector) must be between 4.05 V and 9.16 V for high
level voltage and between -5 V and 0.8 V for low level voltage.
Exposure
Matrox Corona also has two 16-bit timers (located in the PSG)
that are software or hardware re-triggerable. The output of
these timers drive the exposure signals. These timers allow you
to control the exposure time and other external events related
to the video source. They can generate variable triggered or
periodic exposure signals.
You can change the exposure time using the MIL-Lite
MdigControl() command.
Pixel Packer
The main purpose of the Pixel Packer is to pack the 24-bit RGB
pixels into two 16-bit words in RGB alpha format. It can extract
any component from the RGB stream and feed it to the
Rainbow-Runner in monochrome format.
Data from the lookup-table output port is fed to the Pixel Packer
and sent to the display section for live 'video-in-window'
applications.
Input lookup-tables
Matrox Corona has three 256x8-bit input LUTs, allowing
independent re-mapping of three 8-bit input streams.
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Troubleshooting
