By Topic

Working-zone encoding for reducing the energy in microprocessor address buses

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
E. Musoll ; Cyrix, Nat. Semicond. Corp., Santa Clara, CA, USA ; T. Lang ; J. Cortadella

The energy consumption due to input-output pins is a substantial part of the overall chip consumption. To reduce this energy, this work presents the working-zone encoding (WZE) method for encoding an external address bus, based on the conjecture that programs favor a few working zones of their address space at each instant. In such cases, the method identifies these zones and sends through the bus only the offset of this reference with respect to the previous reference to that zone, along with an identifier of the current working zone. This is combined with a one-hot encoding for the offset. Several improvements to this basic strategy are also described. The approach has been applied to several address streams, broken down into instruction-only, data-only, and instruction-data traces, to evaluate the effect on separate and shared address buses. Moreover, the effect of instruction and data caches is evaluated. For the case without caches, the proposed scheme is specially beneficial for data address and shared buses, which are the cases where other codings are less effective. On the other hand, for the case with caches the best scheme for the instruction-only and data-only traces is the WZE, whereas for the instruction-data traces it is either the WZE or the bus-invert with four groups (depending on the energy overhead of these techniques).

Published in:

IEEE Transactions on Very Large Scale Integration (VLSI) Systems  (Volume:6 ,  Issue: 4 )