Chapter 3
Hardware Overview
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National Instruments Corporation
3-3
Multiple-Tap Data Formatter
Many digital cameras transfer multiple channels, or taps, 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 similar directions.
The multiple-tap data formatting circuitry on the PCI/PXI-1422 can
reorder the data from up to two 8-bit 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.
SDRAM
The PCI/PXI-1422 comes with 32 MB of onboard high-speed synchronous
dynamic RAM (SDRAM).
Advanced Clock Generation
The advanced clock generation circuitry on the PCI/PXI-1422 generates
frequencies from 500 kHz to 40 MHz for digital cameras that require an
external clock.
RS-232 Serial Interface (UART)
You can use the RS-232 serial interface on the 100-pin SCSI-type
connector to control digital cameras that also have a serial interface
for camera control and configuration.
Note
The RS-232 serial interface is accessible only via the NI-IMAQ driver software.
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 of these
lines to start an acquisition on a rising or falling edge. In addition, you can
drive each line asserted or unasserted, similar to a digital I/O line. You
can also map pulses from the high-speed timing circuitry or many of the
PCI/PXI-1422 status signals to these trigger lines. There are four external
and four RTSI bus triggers. You can program each of these triggers in
polarity and direction.
