User manual

3 Chapter 1
1.1.1 32-bit PCI bus Mastering DMA Data Transfer
The PCIE-1744 supports PCI bus mastering DMA for high-speed data
transfers. By setting aside a block of memory in the PC, the card performs
bus-mastering data transfers without CPU intervention, freeing the CPU
to perform other more urgent tasks such as data analysis and graphic
manipulation. The function allows users to run all I/O functions simulta-
neously at full speed without losing data.
1.1.2 Four A/D Converters for Simultaneous Sampling
The PCIE-1744 is capable of simultaneous sampling with their 4 identical
circuits and a dedicated A/D converter for each analog input channel.
When the time relationship between inputs is important, this feature lets
you sample simultaneously.
1.1.3 Supports S/W, Internal & External Pacer Triggering
The PCIE-1744 supports three kinds of trigger modes for A/D conver-
sion: software triggering, internal pacer triggering and external pacer trig-
gering. The software trigger can acquire a sample whenever needed,
while the internal pacer saves CPU resources by triggering the sampling
at a pre-programmed frequency. An external pacer can also be used for
triggering by externally connected equipment.
1.1.4 Onboard FIFO Memory
There is 32k of FIFO sample memory on PCIE-1744. This is an important
feature for faster data transfers and more predictable performance under
Windows systems.
1.1.5 Auto Calibration
The PCIE-1744 features software auto calibration. There is no variable
resister trimming required. This is convenient for user calibration.
Note: For detailed specifications of the PCIE-1744,
please refer to Appendix A, Specifications.