parallel

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parallel
Pd parallel.png
Name Parallel
Description Generic parallel synchronous bus
Status supported
License GPLv2+
Source code decoders/parallel
Input logic
Output parallel
Probes
Optional probes CLK, D0-D63
Options clock_edge, wordsize, endianness

The parallel protocol decoder can decode (synchronous or asynchronous) parallel buses with various number of data bits/probes and one optional clock line.

Hardware

There's a lot of hardware (ICs, connectors) that uses various kinds of sync or async parallel protocols.

Generally there are a number of data lines (e.g. 8 or 16) and (in the synchronous case) a clock line.

Protocol

On either the falling or rising clock edge one or more data lines (D0 up to possibly D63, for example) are sampled, and the individual probe values are combined to a number that is shown.

If no clock pin is supplied, the decoder works in asynchronous mode and samples the data lines upon each transition on any of the data lines.

Resources