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/* SPU HLSW V10.1 - WHAT'S NEW !!

/*

/* Project: 	HSO/PACS, SPU HLSW

/* Contact:	spuhlsw@prip.tuwien.ac.at 

/* Date:	15-06-2004

/*-----------------------------------------------------



SPU HLSW 10.1 is positioned as an upgrade of SPU HLSW 10.0, containing the following new features:

* Lower processing time using Rzip algorithm.

* Detector Selection algorithm for Blue photometry improved in term of processing time. 

* TM buffer size decreased to 257 packets.

* DEC/MEC Header Check is performed after storing and closing a buffer.



This will be explained in the specific sections that follow.



The required Decompression SW version is:



- Decompress10 (Ground Decompression Software in Java) The SPU HLSW Development Team.





Lower processing time using Rzip algorithm

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Rzip algorithm makes use of a faster bit coding function which decreases the CPU workload by   25%. This bit coding function is supported by a look-up table that stores the bit location to make bit coding faster.



Detector Selection algorithm for Blue photometry improved in term of processing time

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To save stack memory, the mechanism for detector selection for blue photometry (the 4 sub-arrays) is done in one function (DXS.c), instead of the 4-time function call (4 tables) from the main function.



TM buffer size decreased to 257 packets

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To have more margin in the stack memory, the TM buffer capacity has been decreased from 305 packets to 257.



DEC/MEC Header Check is performed after storing and closing a buffer

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To decrease the processing time of the supervisor task in blue photometry by 66%, the DEC/MEC header check is performed after receiving and closing one buffer (~0.5 MB). This check was done in the previous SW version each time SPU, in started compression, receives a science data frame from DEC/MEC.



The following c/h files has been changed since HLSW version 10.0:



- dmch_cp.c 

- dxs.c

- llc.c

- spuasw.h

- Spvs_Tst.c

- supervs.c

- write.c

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