Measurement-computing WaveBook rev.4.0 Manuel d'utilisateur télécharger pdf (Page 49)

WaveBook User’s Manual

06-08-01

WaveBook Operation Reference 4-3

For every sample, the DSP reads from a scan sequence table and accordingly programs the control-and-

timing circuit for the next sample. The circuit waits precisely until the start of the next sample and then

selects the: input channel, PGA gain, level-shifter offset, and A/D input source. It also conveys this

information to any attached expansion units and precisely controls the A/D conversion timing.

The EEPROM holds the calibration information needed for real-time sample correction.

The digital I/O port is read and written by the Digital Signal Processor to transfer bytes of digital data.

It may be used as a simple 8-bit input port or as a 32-address byte-wide I/O port.

The high-speed EPP/ECP interface circuit connects the WaveBook and any attached printer to the PC via

standard DB-25 connectors. When the WaveBook is active, the interface holds the printer in a stable state;

and when the WaveBook is inactive, the interface connects the PC to the printer.

Pin-header J101 allows the addition of the WBK30 memory option. The WBK30 is detailed in the

WBK30 Document Module. Pin-headers J10 and J11 allow the addition of the optional WBK11, WBK12,

or WBK13. These cards can also be added toWBK10/10H/10A expansion modules.

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Measurement-computing WaveBook rev.4.0 Manuel d'utilisateur Page 49