Chapter 2
Hardware Overview
©
National Instruments Corporation
2-3
NI PXI/PCI-1428 User Manual
LUTs
The NI 1428 offers lookup tables (LUTs) that can perform operations such
as contrast enhancement, data inversion, gamma manipulation, or other
nonlinear transfer functions. The LUT fully supports any 8-bit to 16-bit
base or medium configuration supported by the NI 1428. Refer to the
Camera Link and the NI 1428
section for more information on supported
Camera Link configurations.
Multiple-Tap Data Formatter
Many digital cameras transfer multiple taps, or channels, of data
simultaneously to increase the frame rate of the camera. However, the data
in each tap may not be transferred in the traditional top-left to bottom-right
direction. Also, the taps may not transfer data in the same direction.
The multiple-tap data formatting circuitry on the NI 1428 can reorder the
data from up to four taps. The data from each tap can be independently
scanned either from left-to-right or right-to-left and top-to-bottom or
bottom-to-top.
Note
For your convenience, data reformatting instructions for these cameras have been
preprogrammed into the camera files.
SDRAM
The NI PXI-1428 has 32 MB of onboard high-speed synchronous dynamic
RAM (SDRAM). The NI PCI-1428 has 16 MB of SDRAM. The NI 1428
uses the onboard RAM as a FIFO buffer to ensure a complete acquisition.
Even when the data rate from the camera exceeds PCI throughput, you can
acquire without interruption until the onboard RAM is full.
Trigger Control and Mapping Circuitry
The trigger control and mapping circuitry routes, monitors, and drives
the external and RTSI bus trigger lines. You can configure each line to start
an acquisition on a rising or falling edge and drive each line asserted or
unasserted, much like a digital I/O line. You also can map pulses from the
high-speed timing circuitry or many of the NI 1428 status signals to these
trigger lines. Four external and four RTSI bus triggers (all of which are
programmable for polarity and direction) are available for simultaneous
use.
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