NDLI: A CELT and MCST capable VME slave interface

Content Provider	IEEE Xplore Digital Library
Author	Wurthwein, F. Strohman, C. Honscheid, K. Staeck, J.
Copyright Year	1963
Abstract	We report on the development of a VME slave interface for the CLEO III detector implemented in an ALTERA EPM7256 CPLD. This includes the first implementation of the chained block transfer protocol (CELT) and multi-cast cycles (MCST) as defined by the VME-P task group of VIPA. Within VME64 there is no operation that guarantees efficient readout of large blocks of data that are sparsely distributed among a series of slave modules in a VME crate. This has led the VME-P task group of VIPA to specify protocols that enable a master to address many slaves at a single address. Which slave is to drive the data bus is determined by a token passing mechanism that uses the IACKOUT, IACKIN daisy chain. This protocol requires no special features from the master besides conformance to VME64. Non-standard features are restricted to the VME slave interface. The CLEO III detector comprises /spl sim/400,000 electronic channels that have to be digitized, sparsified, and stored within 20 /spl mu/s in order to incur less than 2% dead time at an anticipated trigger rate of 1000 Hz. 95% of these channels are accounted for by only two detector subsystems, the silicon microstrip detector (125,000 channels), and the ring imaging Cerenkov detector (RICH) (230,400 channels). The occupancy after sparsification in either of these two detector subsystems is expected to be less than 1%, resulting in event fragments on the order of 10 KBytes each, spread over 4, and 8 VME crates, respectively. We developed a chip set that sparsifies, tags, and stores the incoming digital data on the data boards, and includes a VME slave interface that implements MCST and CELT protocols. In this paper, we briefly describe this chip set and then discuss the VME slave interface in detail.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	429
Ending Page	435
Page Count	7
File Size	995478
File Format	PDF
ISSN	00189499
Volume Number	44
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Protocols Event detection Data acquisition Silicon Physics Cosmic rays Particle beams Master-slave Microstrip
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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