Chapter 3
Hardware Overview
©
National Instruments Corporation
3-3
Digital Filter and LUT
The digital filter removes chrominance from a composite color video signal
that conforms to either PAL or NTSC. The output of the digital filter passes
through the 1024
x
10-bit lookup table (LUT). You can configure the LUT
to implement simple imaging operations such as contrast enhancement,
data inversion, gamma correction, or other user-defined transfer functions.
Onboard Memory
The PCI/PXI-1409 comes with 16 MB of SDRAM for temporary storage
of the image data being transferred to the system memory through the PCI
bus. The memory can store multiple image buffers.
Scatter-Gather DMA Controllers
The PCI/PXI-1409 uses three independent onboard direct memory access
(DMA) controllers. The DMA controllers transfer data between the
onboard SDRAM memory buffer and the PCI bus. Each of these controllers
supports scatter-gather DMA, which allows the controllers to reconfigure
on the fly. Therefore, the PCI/PXI-1409 can perform continuous image
transfers directly to either contiguous or fragmented memory buffers.
PCI Interface
The PCI/PXI-1409 implements the PCI interface with a National
Instruments custom application-specific integrated circuit (ASIC), the
PCI MITE. The PCI interface can transfer data at a maximum rate of
132 MB/s in bus master mode.
Genlock Circuit and SYNC Mux
The genlock circuit receives the incoming video signal and generates
PCLK, HSYNC, and VSYNC signals for use by the acquisition and control
circuitry. The 1409 device can lock to the standard RS-170/NTSC and
CCIR/PAL video signals as well as progressive scan and VGA
(640
×
480 resolution) signals. The genlock circuit on the 1409 device can
also lock to external HSYNC and VSYNC or CSYNC signals.
