Browse Prior Art Database

Method of Combining Deterministic and Non-deterministic Ideal Memories

IP.com Disclosure Number: IPCOM000029798D
Original Publication Date: 2004-Jul-13
Included in the Prior Art Database: 2004-Jul-13
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Abstract

The Method of Combining Deterministic and Non-deterministic Ideal Memories within a Simulation Environment helps eliminate the need for complex command tracking and improve simulation performance.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 80% of the total text.

Page 1 of 2

Method of Combining Deterministic and Non -deterministic Ideal Memories

Ideal Memory provides references to the current data of any address at any given time during Simulation. Ideal Memory is updated or read from at a specific state of a transaction called Global Visibility. When a command becomes globally visible, Ideal Memory is updated for Stores and read from for Loads. This Global Visibility requires complex command tracking process per individual command. Global Visibility is needed for deterministic Ideal Memory. However, for non-deterministic memory, we only have to ensure the success of the data transfer without worrying about its contents. Therefore, we can eliminate the need for complex command tracking, command dependencies, and improve the simulation performance by having both deterministic and non-deterministic Ideal Memory Models in a simulation environment.

     The core idea is to have both deterministic and non-deterministic Ideal Memory models within a simulation environment. For commands such as Clustering, we will need to use Deterministic Memory. For commands that don't require deterministic memory, we can eliminate problems with race conditions between commands from different buses/devices and ordering problems between different command types by using non-deterministic Ideal Memory. Non-deterministic Ideal Memory also helps improve simulation performance from not having to track commands through internal Hardware.

     Deterministic Ideal Memory is...