NI 656x

The NI 656x is a 16-channel digital I/O device that you can use as a PC/peripheral device interface, pattern generator, pattern analyzer, or stimulus-response tester. The NI 6561 has a maximum Sample clock frequency of 100 MHz, and the NI 6562 has a maximum Sample clock frequency of 200 MHz. Using the data rate multiplier of these devices, you can generate and acquire data at 200 Mb/s or 400 Mb/s, respectively.

The NI 656x also provides the following features:

• Sophisticated timing engine to maintain and measure the timing parameters of a DUT
• LVDS voltage levels for high-speed interfacing to devices
• Data channels with per channel software direction control
• Selectable single-ended LVCMOS or differential LVDS configuration for PFI channel 3 on the DDC connector
• Double-data rate (DDR) or single-data rate (SDR) data rate multiplier options
• Deep onboard memory with triggering and pattern sequencing capabilities
• Ability to use NI-TClk to synchronize multiple devices

You can use the internal On Board Clock or import an external clock through the front panel. You can also shift the generated data, acquired data, and exported Sample clock relative to the onboard clock for clock frequencies above 25 MHz, which is critical when accounting for propagation delays and setup-and-hold times in the DUT.

Expand this book for more information about NI 656x hardware-related topics.