Browse Prior Art Database

Extended Bit Steering of DRAM's

IP.com Disclosure Number: IPCOM000109941D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 61K

Publishing Venue

IBM

Related People

Blake, RM: AUTHOR [+3]

Abstract

This disclosure describes an improved method of re-ordering fetched data from multi-bit memory devices that allows larger data blocks to be re-ordered than previously disclosed techniques have permitted.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 61% of the total text.

Extended Bit Steering of DRAM's

      This disclosure describes an improved method of re-ordering
fetched data from multi-bit memory devices that allows larger data
blocks to be re-ordered than previously disclosed techniques have
permitted.

      Normally, in multi-bit memory devices using previously
disclosed bit steering methods, the depth of the data block that
could be re-ordered was limited by the fact that each data output
line could steer between two bits only.  This limitation provided for
a maximum of 8 data words that could be re-ordered, under one
steering vector, for X4 memory devices.  This disclosure describes a
means by which the size of the data block to be re-ordered can be
expanded to 16 data words for X4 memory devices.

      This disclosure accomplishes this in the following manner.
During a fetch operation, a memory device, using normal addressing
schemes, accesses 4 data bits per data output line and buffers this
data internally in the memory device.  The memory device now has a
total of 16 data bits buffered within the device where each of these
bits belong to a separate data word.  To be able to start the
fetching on any data word (and therefore any of the 16 data bits) and
then wrap contiguously around the group of 16, it is sufficient to
identify the beginning word and its associated bit.  Once the
starting bit has been identified, the sequence for all data output
lines is determined for the first and subsequent fetches.  This...