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Frame Grabber
(C2,7M1)
The command channel is used by the frame grabber to send command, configuration, and
programming data to the camera and to receive command responses, status, and image data from
the camera.
The designation C2,7M1 defines the use of a SFF-8470 connector (C2) and up to 7 lanes of data
with 1 command channel using M-Protocol (8b/10b) at the default speed of 3.125Gb/sec.
When using a CX4 Active Optical Cable fiber module, only the command channel and data lanes 0,
1, 2 and 3 (C2,4M1) will be available, with an associated reduction in bandwidth. Use two fiber
modules to retain the full performance of the camera.
The Piranha XL camera has two CLHS connectors that allow data to be routed to two separate
frame grabbers installed in the same or separate PC's.
A feature of CLHS is that the initialization of the frame grabber automatically starts a discovery
process that will identify the lane configuration of the camera. This process is transparent to the
user and requires no action by the user to correctly configure the link.
Camera Link HS Transmission Characteristics
The camera's data distribution supports two cables with single CLHS ROI capability. The single
CLHS ROI is determined from the 1 to 4 areas of interest (AOI) entered by the user and transmitted
across all seven data lanes. There is a minimum of 96 pixels per data lane used.
CLHS limits the start and stop location of the ROI to a multiples of 32 pixels. The maximum line
rate is limited by the sensor when not limited by the CLHS cable or by the PCIe transfer. The sensor
is limited to a 125 kHz maximum line rate.
The CLHS cable has approximately 2.1 GByte / sec bandwidth for seven lanes.
The XTIUM frame grabber has about 1.6 GByte / sec across the PCIe bus.
The Frame Grabber is able to store rows in order to perform a "burst-type" operation. CLHS packs
the bits, while the frame grabber unpacks 12 bit data into 16 bit data across the PCIe bus.
The table below shows a single cable with seven lane limits. When using 2 cables the performance
is equivalent to using an 8k ROI and limited to the sensor's maximum data rates.
10 •
Command
Channel
TXC
RXC
Data Lane 0
RX1
RX2
RX3
RX4
RX5
RX6
Data Lane 6
Figure 2. Single CLHS Connector Configuration
Video
Link
Channel
Camera
(C2,7M1)
RXC
TXC
TX1
TX2
TX3
TX4
TX5
TX6
The Piranha XL XDR Camera
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