Piranha 3 User Manual
03-032-10216-02
DALSA
72
Video Data
The Channel Link technology is integral to the transmission of video data. Image data
and image enable signals are transmitted on the Channel Link bus. Four enable signals
are defined as:
• FVAL—Frame Valid (FVAL) is defined HIGH for valid lines.
• LVAL—Line Valid (LVAL) is defined HIGH for valid pixels.
• DVAL—Data Valid (DVAL) is defined HIGH when data is valid.
• Spare— A spare has been defined for future use.
All four enable signals must be provided by the camera on each Channel Link chip. All
unused data bits must be tied to a known value by the camera. For more information on
image data bit allocations, refer to the official Camera Link specification on the
http://vfm.dalsa.com
Web site.
Camera Control Signals
Four LVDS pairs are reserved for general-purpose camera control. They are defined as
camera inputs and frame grabber outputs. Camera manufacturers can define these signals
to meet their needs for a particular product. The signals are:
• Camera Control 1 (CC1)
• Camera Control 2 (CC2)
• Camera Control 3 (CC3)
• Camera Control 4 (CC4)
The Piranha3 uses the following camera control signals:
Table 15: DALSA Camera Control Configuration
C1
EXSYNC, negative edge active
CC2
PRIN
CC3
Not Used
CC4 Not
Used
Communication
Two LVDS pairs have been allocated for asynchronous serial communication to and from
the camera and frame grabber. Cameras and frame grabbers should support at least 9600
baud. These signals are
• SerTFG—Differential pair with serial communications to the frame grabber.
• SerTC—Differential pair with serial communications to the camera.
The serial interface will have the following characteristics: one start bit, one stop bit, no
parity, and no handshaking. It is recommended that frame grabber manufacturers supply
both a user interface and a software application programmming interface (API) for using
the asynchronous serial communication port. The user interface will consist of a terminal
program with minimal capabilities of sending and receiving a character string and
sending a file of bytes. The software API will provide functions to enumerate boards and
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