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D Data Encoding

Clusters of 8-bit input data, which may represent one or more physical pulses depending on the settings of threshold and skirt width, are passed to a 32-bit output buffer. Each cluster is followed by a 2-byte cluster header, comprising the bin address and cluster length. Following the last cluster header, a 4-byte channel header is generated. This contains a word count, cluster count, status and channel ID.

Zeroes are inserted after the last cluster header in order to word-align the channel header.

The output data is read via FASTBUS as 32-bit words. Data for all 16 channels may be read with one block transfer operation.



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A.Daviel,TRIUMF