Browse Prior Art Database

Switching of Cam-Functions

IP.com Disclosure Number: IPCOM000119195D
Original Publication Date: 1996-Mar-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Helwig, K: AUTHOR [+2]

Abstract

Disclosed is a method which shows the application of the IOM-signal which is active during the compare cycle at which stored data is compared with applied data. Fig. 1 shows the application.

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Switching of Cam-Functions

      Disclosed is a method which shows the application of the
IOM-signal which is active during the compare cycle at which stored
data is compared with applied data.  Fig. 1 shows the application.

      If the IOM-signal (invalidate on match) is activated, all
read- and write-cycles should be disabled.  In this case only a
compare cycle or a match cycle should be enabled.  This is
accomplished by means of the array lock and IOM by applying the
following array signals: (Array clock starts the timing chain and
hence the entire sequence of the cycle).  IOM acts on:
  a) An address phase splitter:  If IOM is active (positive) the
phase
      splitter remains unselected.  Both outputs remain positive.  As
a
      consequence, all wordlines stay unselected.
  b) All true/complement generators for the compare data are
activated
      by IOM.
  c) The enable signal which is generated by the timing chain is
anded
      with IOM.  The enable signal gates the HIT/MISS-signal.  Only
if
      the IOM is active a HIT-signal can proceed to the R/W-array
      (Fig. 2).
  d) The SET SENSE AMPLIFIER-signal which is generated by the timing
      chain is anded with IOM.  If IOM is active a change of the data
      output is prohibited.

      This is advantageous in so far as the IOM-signal is applied in
a way so that there is no performance penalty for the write- and
read-cycles.

      Furthe...