HFC_cfg.h File Reference

Defines the interface to and data structure containing the parameters used in filtering heavy ions. This is just a front for the most current version. More...

#include <EDS/EDS_tag.h>
#include <EFC_DB/EFC_DB_sampler.h>
#include <XFC_DB/HFC_DB_schema.h>
#include <PBI/Endianness.h>

Classes
struct	_HFC_cfgSampler
	Marries sampler with a tag identifer. More...
union	_HFC_cfgPrms
	Union of all the versions of the configuration parameter structure. More...
Defines
#define	HFC_CFGPRMS_K_VERSION   0
	The current version number of the user parameter configuration structure.
#define	HFC_CFGSAMPLER_K_VERSION   0
	The current version number of the user sampler configuration structure.
Typedefs
typedef struct _HFC_cfgSampler	HFC_cfgSampler
	Typedef for struct _HFC_cfgSampler.
typedef union _HFC_cfgPrms	HFC_cfgPrms
	Typedef for union _HFC_cfgPrms.

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Detailed Description

Defines the interface to and data structure containing the parameters used in filtering heavy ions. This is just a front for the most current version.

Author:

JJRussell - russell@slac.stanford.edu

    CVS $Id: HFC_cfg.h,v 1.2 2011/03/28 20:50:54 russell Exp $

Overview

The filter configuration consists of 2 major configuration blocks. The first controls the various criteria the filter uses when making its decision. The second block controls the sampling of the filter's output for monitoring purposes

Parameter Block

Contains all the filter cuts

Sampling Block

In order to monitor the filter, a certain percentage of the events can be leaked from the filter. There are two distinct methods of doing this.

1. Globally
2. Individually

Global Sampling

Every n events the veto mask is set to 0. This effectively allows the filter to perform all its evaluations but prevents it from kicking out on any veto condition. This is a very simple way to get an unbiased sample.

Individual

This allows the filter to run normally, but each time an individual veto criteria is meet, a prescaler is decremented. When the prescaler reaches 0, the event is passed to the output stage, thus ignoring the reject decision of the filter.

Arbitration

The global sampling is always evaluated first.