The data and control signals are sent simultaneously.
MULTICLOCK DOMAIN GENERATOR
This is most often done by creating data-control pairs, in which the data piece is a single bit or multiple bits, and the control piece is typically a single bit passed through a synchronizing pulse generator to load the data piece into the receiving clock domain. MCP formulation and usageĪnother important technique used to pass signals between clock domains employs a multi-cycle path (MCP) formulation.įor signals that traverse between clock domains, the effects of metastability must be localized and controlled at the crossing. By registering a signal before allowing it to pass a CDC boundary, you remove the multiple combinational settling edges and limit potential transitions to one edge per sending clock cycle, thereby reducing the potential for generating metastable signals. A signal that experiences combinational settling in fact creates more edges that can be sampled in the receiving clock domain and therefore more chances that a changing signal will be sampled while changing and cause metastability. If a signal is allowed to pass through combinational logic before it is passed into a receiving clock domain, it may experience combinational settling. īefore passing any signal between clock domains, fi rst register the signal in the sending clock domain. Many of these issues and their potential solutions are documented in. Several problems relate to passing a single bit between clock domains. This paper details some of those methods that enable design teams to avoid problems and verify compliance with good CDC design techniques.
MULTICLOCK DOMAIN VERIFICATION
These can be avoided by following a few design guidelines and using well-established verification techniques. re-verify that gates (post-synthesis & scan insertion) still adhere to proper CDC design rules.Ĭlock Domain Crossing (CDC) design errors can cause serious and expensive design failures.use formal analysis or instrumented simulation to ensure functionality and.
MULTICLOCK DOMAIN FULL
These can be avoided by following a few critical guidelines and using well-established verification techniques. (License No.Clock domain crossing (CDC) errors can cause serious design failures. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380Īll 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. SoC test / wrapper design / multi-clock domain core / / / / / By dividing test application into two steps considering the difference of test data volume in inter-domain tests and intra-domain tests, the proposed method can reduce test time compared to the previous wrapper designs for multi-clock domain cores. This paper presents an optimization method for designing reconfigurable test wrappers for cores with multiple clock domains. Takashi Yoshida, Tomokazu Yoneda, Hideo Fujiwara ( Nara Institute of Science and Technology) VLD2008-82 DC2008-50 Ken-system: A Reconfigurable Wrapper Design for Testing Cores with Multi-Clock Domains IEICE Technical Committee Submission SystemĪ Reconfigurable Wrapper Design for Testing Cores with Multi-Clock Domains
0 kommentar(er)
