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Appendix A Specifications for PCI and PXI Buses
6023E/6024E/6025E User Manual A-8 ni.com
Handshaking...........................................2-wire
Power-on state
PA<0..7> .........................................Input (High-Z),
100 kΩ pull-upto+5VDC
PB<0..7>..........................................Input (High-Z),
100 kΩ pull-upto+5VDC
PC<0..7>..........................................Input (High-Z),
100 kΩ pull-upto+5VDC
Data transfers..........................................Interrupts, programmed I/O
Timing I/O
Number of channels................................2 up/down counter/timers,
1 frequency scaler
Resolution
Counter/timers.................................24 bits
Frequency scalers ............................4 bits
Compatibility..........................................TTL/CMOS
Base clocks available
Counter/timers.................................20 MHz, 100 kHz
Frequency scalers ............................10 MHz, 100 kHz
Base clock accuracy................................±0.01%
Max source frequency.............................20 MHz
Min source pulse duration ......................10 ns in edge-detect mode
Min gate pulse duration..........................10 ns in edge-detect mode
Data transfers..........................................DMA, interrupts,
programmed I/O
DMA modes ...........................................Scatter-gather
(single transfer, demand transfer)