Browse Prior Art Database

Memory Array Address Verification

IP.com Disclosure Number: IPCOM000121247D
Original Publication Date: 1991-Aug-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Douse, DE: AUTHOR [+3]

Abstract

A method is shown for allowing memory address verification, i.e., the address sent to a memory chip results in a response from the chip addressed indicating a fault/no fault exists.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 83% of the total text.

Memory Array Address Verification

      A method is shown for allowing memory address
verification, i.e., the address sent to a memory chip results in a
response from the chip addressed indicating a fault/no fault exists.

      Chip address verification is especially important during system
usage. It is important to have feedback which verifies that the chip
addressed either stored the data in the correct location, fetched the
data from the correct location, or a multiple select caused data to
be stored or fetched incorrectly. A method is shown for implementing
memory array address verification.

      Referring to the figure, the diagram shows a method for
enhancing a processing system's ability to verify internal memory
chip addressing or whether an address fault exists. The input
addresses are re ceived by the chip, buffered by the input buffer,
and sent internally through the chip for use in decoding. A set of
latches associated with the internal row address bus are used to copy
the internal row address. When the decoded wordline is selected, a
personalized ROS array at the end of the wordline contains the row
address which is sent to a comparator to be matched with the incoming
address. If a match exists, no chip fault is recorded. The identical
technique is utilized for column addresses. The resultant output from
the two comparators, when ORed together, is returned to the system
for appropriate action, i.e., no action required, memory retry,
memory error...