100 and 50 MHz, Programmable-Voltage

Digital Waveform Generator/Analyzers

4

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Generation Signal Characteristics (data, DDC Clk Out, and PFI <0..3> channels)

Data channel-to-channel skew..............................................

±300 ps (typical across all data channels)

±900 ps (maximum across all data channels)

Maximum data channel toggle rate ......................................

NI 6551: 25 MHz; NI 6552: 50 MHz

Data formats ..........................................................................

NRZ

Data position modes..............................................................

Rising edge, falling edge, delayed relative to sample clock

Generation data delay range.................................................

0 to 1 sample clock period for clock frequencies

Generation data delay resolution..........................................

1/256 of sample clock period for clock frequencies

Acquisition Signal Characteristics (data, strobe, and PFI <0..3> channels)

Channel-to-channel skew ......................................................

±400 ps (typical across all data channels)

±900 ps (maximum across all data channels)

Minimum detectable pulse width .........................................

4 ns (required at both acquisition voltage thresholds)

Acquisition timing delay range..............................................

0 to 1 sample clock periods for clock frequencies

Acquisition timing delay resolution.......................................

1/256 of sample clock period for clock frequencies

Waveform Characteristics

Triggers (inputs to the NI 655x)

Trigger types ..........................................................................

Start Trigger, Pause Trigger, Script Trigger <0..3> (generation sessions only)

Reference Trigger (acquisition sessions only)

Multirecord Advance Trigger (acquisition sessions only)

Sources ..................................................................................

1. PFI <0> (SMB jack connector)

2. PFI <1..3> (DDC connector)

3. PXI_TRIG<0..7> (PXI backplane, PXI only), RTSI <0..7> (PCI only)

4. PXI_STAR (PXI backplane, PXI only)

5. Pattern match (acquisition sessions only)

6. Software (user function call)

7. Disabled (do not wait for a trigger)

Trigger detection....................................................................

1. Start Trigger (edge detection: rising or falling)

2. Pause Trigger (level detection: high or low)

3. Script Trigger <0..3> (edge detection: rising or falling, Level detection: high or low)

4. Reference Triggers (edge detection: rising or falling)

5. Advance Trigger (edge detection)

Minimum required trigger pulse width .................................

30 ns

Destinations ...........................................................................

1. PFI 0 (SMB jack connector)

2. PFI <1..3> (DDC connector)

3. PXI_TRIG <0..7> (PXI backplane, PXI only), RTSI <0..7> (PCI only)

Each of the triggers can be routed to any of the 13 destinations

except the pause trigger cannot be exported.

Memory and Scripting

Onboard memory size

(assumes no scripting

instructions)

1 Mb/channel

(for generation sessions)

8 Mb/channel

(for generation sessions)

64 Mb/channel

(for generation sessions)

1 Mb/channel

(for acquisition sessions)

8 Mb/channel

(for acquisition sessions)

64 Mb/channel

(for acquisition sessions)

Generation Modes

Waveform: Generate a single waveform once, N times, or continuously.

Scripted: Generate a simple or complex sequence of waveforms. Use scripts to describe the waveforms to be generated,

the order in which the waveforms are generated, how many times the waveforms are generated, and how the device

responds to script triggers.