Browse Prior Art Database

Multiple Card Resynchronization Mechanism

IP.com Disclosure Number: IPCOM000111045D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Blackmon, LL: AUTHOR [+4]

Abstract

A method of maintaining synchronous card operation across multiple independent memory cards is disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 86% of the total text.

Multiple Card Resynchronization Mechanism

      A method of maintaining synchronous card operation across
multiple independent memory cards is disclosed.

      The following describes the "multiple card resynchronization
mechanism" scheme.  Continuous card operation across all cards
(A,B,C,D) is maintained via use of the following signals (Figure).

o   Strobe - The signal is assumed synchronous across all cards.

o   Internal chip resync - Used to resync a particular cards internal
    logic.

o   Event on card A - Driven to other cards (B,C,D) when a
    asynchronous condition on card A is detected.

o   Event on card B (C,D) - Received by card A when B (C,D) detects
    an asynchronous condition.

These signals are used as follows:

o   When a asynchronous event on card A is detected it drives "event
    on card A" to B, C and D.

o   Card A, after an appropriate amount of time (to account for time
    of flight delay to B, C, D) activates it's "internal chip resync"
    signal.  Cards B, C and D upon receiving "event on card A"

    immediately activate their "internal chip resync" signals.  In
    addition cards B,C and D activate their "event on card"
    signals(all cards event signals now active).

o   All cards upon activating their "internal chip resync" signals
    begin "counting" strobes.  When a set number are detected, the
    cards simultaneously deactivate their "event on card" signals.

o   Synchronous op...