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Paper Abstract and Keywords
Presentation 2013-03-14 09:10
Guarantee of finising of calculate for a low power accelerator CMA
Akihito Tsusaka, Mai Izawa, Rie Uno, Nobuaki Ozaki, Hideharu Amano (Keio Univ.) CPSY2012-86 DC2012-92
Abstract (in Japanese) (See Japanese page) 
(in English) Cool Mega-Array (CMA) is a novel high performance but low power
reconfigurable accelerator consisting of a large PE (Processing Element) Array
and small $\mu$ controller.

Since PE array in CMA is pure combination circuits,
the completion time of calculation is not fixed, i.e.,
completion of calculation is depending on the application datapath.
Although the programmer can predict the time of completion
and described in the code of $\mu$ controller,
the exact delay is influenced by the temperature and variance of the product.
The prediction is difficult especially with the advanced process.

In order to address this problem, we propose a hardware mechanism that guarantees the completion of
execution of application, without a negative influence on the power consumption in PE array,
area, and the availability of application as possible.
The delayed signal which shows the completion of calculation is transmitted within PE array.
It is inputted when a calculation starts, propagated on the datapath, and
outputted after the completion of calculation.
The controller can check the signal and gather results automatically.

Using the mechanism, the programmer does not need to describe the completion time of calculation
in a code, with the increase of 1.15\% of area and 0.448\% of electric power.
Keyword (in Japanese) (See Japanese page) 
(in English) Low Power Design / Reconfigurable System / Accelerator / / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 481, CPSY2012-86, pp. 205-210, March 2013.
Paper # CPSY2012-86 
Date of Issue 2013-03-06 (CPSY, DC) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF CPSY2012-86 DC2012-92

Conference Information
Committee CPSY DC IPSJ-SLDM IPSJ-EMB  
Conference Date 2013-03-13 - 2013-03-14 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CPSY 
Conference Code 2013-03-CPSY-DC-SLDM-EMB 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Guarantee of finising of calculate for a low power accelerator CMA 
Sub Title (in English)  
Keyword(1) Low Power Design  
Keyword(2) Reconfigurable System  
Keyword(3) Accelerator  
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1st Author's Name Akihito Tsusaka  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Mai Izawa  
2nd Author's Affiliation Keio University (Keio Univ.)
3rd Author's Name Rie Uno  
3rd Author's Affiliation Keio University (Keio Univ.)
4th Author's Name Nobuaki Ozaki  
4th Author's Affiliation Keio University (Keio Univ.)
5th Author's Name Hideharu Amano  
5th Author's Affiliation Keio University (Keio Univ.)
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Speaker Author-1 
Date Time 2013-03-14 09:10:00 
Presentation Time 25 minutes 
Registration for CPSY 
Paper # CPSY2012-86, DC2012-92 
Volume (vol) vol.112 
Number (no) no.481(CPSY), no.482(DC) 
Page pp.205-210 
#Pages 6 
Date of Issue 2013-03-06 (CPSY, DC) 

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