Memory Management for Synthesis of DSP Software
Memory Management for Synthesis of DSP Software Praveen K. Murthy Shuvra S. Bhattacharyya
Boca Raton London New York
A CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa plc.
DK6037_Discl.fm Page 1 Wednesday, December 28, 2005 3:09 PM
Published in 2006 by CRC Press Taylor & Francis Group 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742 © 2006 by Taylor & Francis Group, LLC CRC Press is an imprint of Taylor & Francis Group No claim to original U.S. Government works Printed in the United States of America on acid-free paper 10 9 8 7 6 5 4 3 2 1 International Standard Book Number-10: 0-8493-3752-6 (Hardcover) International Standard Book Number-13: 978-0-8493-3752-9 (Hardcover) Library of Congress Card Number 2005046691 This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. A wide variety of references are listed. Reasonable efforts have been made to publish reliable data and information, but the author and the publisher cannot assume responsibility for the validity of all materials or for the consequences of their use. No part of this book may be reprinted, reproduced, transmitted, or utilized in any form by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying, microfilming, and recording, or in any information storage or retrieval system, without written permission from the publishers. For permission to photocopy or use material electronically from this work, please access www.copyright.com (http://www.copyright.com/) or contact the Copyright Clearance Center, Inc. (CCC) 222 Rosewood Drive, Danvers, MA 01923, 978-750-8400. CCC is a not-for-profit organization that provides licenses and registration for a variety of users. For organizations that have been granted a photocopy license by the CCC, a separate system of payment has been arranged. Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are used only for identification and explanation without intent to infringe.
Library of Congress Cataloging-in-Publication Data Murthy, Praveen K., 1969Memory management for synthesis of DSP software / Praveen K. Murthy and Shuvra Bhattacharyya. p. cm. Includes bibliographical references and index. ISBN 0-8493-3752-6 (alk. paper) 1. Signal processing--Digital techniques. 2. Integrated circuits--Very large scale integration. 3. Computer software--Development. I. Bhattacharyya, Shuvra S., 1968- II. Title. TK5102.9.M87 2006 2005046691
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and the CRC Press Web site at http://www.crcpress.com
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Praveen Murthy
Shuvra Bhattacharyya
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5& procedure ScheduleLoops input: a connected, consistent SDF graph " . output: a valid unit blocking factor looped schedule
"
3
for
". step 1: Use % 2 to determine the nontrivial SCCs 0 1
0
step 2: Cluster 0 1 0 2
&
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into the actors & 1 & 2
of " .
respectively; denote the resulting acyclic graph by " . step 3: Apply % 3 to " ; denote the resulting schedule by step 4:
.
Q 1 2
for
denote subgraph 0
Let "
.
Apply % 1 to " . if + 4
0 are found such that + is subindependent of
4 in " • Determine the connected components + 1 + 2
+
and 4 1 4 2 4 ! of subgraph + and subgraph 4 respectively. • Recursively apply ScheduleLoops to construct
Q ρ " + 1 SL subgraph + 1
ρ " + SL subgraph +
Q ρ " 4 1 SL subgraph 4 1
ρ " 4 ! SL subgraph 4 !
0
0
0
,
0
• Replace the single appearance of &
in
.
with
. else ( "
is tightly interdependent)
• Apply % 4 to obtain a valid schedule • Replace the single appearance of & in end if end for step 5: Output
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Algorithm
Name
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CSDF Repetitions Vector { // Step 1 compute 3 for all actors // Step 2 for all actors for each output port for each input port
of of
, compute , compute
// Step 3 apply algorithm for SDF balance equations on the SDF-equivalent graph. Let
be the solution for
actor A. // Step 4 for each
returned in step 3, compute the total
number of repetitions
Q
as
}
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