Mixed-Mode digital add-on for the Spectrum M2p.59xx-x4 digitiser cards
Using an optional module for the M2p.59xx range 16 synchronous LVTTL digital multi-purpose I/O lines can be added. The additional digital lines add to the four multi-purpose "XIO" lines that are already standard on the digitiser connector panel. A total of 19 synchronous digital inputs are now be possible, or 20 asynchronous (polled) outputs. The synchronous inputs are one less in number as one multi-purpose line is output only.
Physically the digital option is a piggy-back module on the digitiser card. For wiring connection it comes in two different versions, one with SMB connectors the other with a FX2 flat-ribbon connector. The SMB-version (M2p.xxxx-DigSMB) offers ten connectors on the front panel of a second computer PCIe slot bracket space. Six more are available internally. The latter can be used for PC-internal cross connection or via external connection via a third slot bracket. The FX2-version (M2p.xxxx-DigFX2) guarantees compatibility with predecessor products from Spectrum and allows parallel connection of all lines through a single connector.
The synchronous digital data is stored inside the analog samples by reducing the resolution. So for example, if using an M2p digitiser with 8 analogue channels and the requirement is to store 8 bits of digital data, each analogue channel can be programmed to hold one bit of digital data, reducing the analogue channel to 15 bits.
There is much versatility in setting up the capture of analogue and digital data in the mixed-mode operation, beyond that described above. See the datasheet for a full listing of functionality. The software drivers allow customised setups that can generate perfectly matching mixed-mode solutions.
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Card image courtesy of Spectrum Instrumentation GmbH
Last modified by DataQuest Solutions Ltd 17.07.20