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1. (WO2018100331) STORAGE CIRCUITRY RESPONSIVE TO A TAG-MATCHING COMMAND

Pub. No.:    WO/2018/100331    International Application No.:    PCT/GB2017/052732
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Sat Sep 16 01:59:59 CEST 2017
IPC: G11C 7/10
G11C 8/06
G11C 8/08
G11C 8/16
G11C 11/408
G11C 11/4093
G11C 11/4096
G06F 12/0846
G06F 12/0864
G06F 12/0895
Applicants: ARM LIMITED
Inventors: HANSSON, Andreas
NIKOLERIS, Nikos
ELSASSER, Wendy Arnott
Title: STORAGE CIRCUITRY RESPONSIVE TO A TAG-MATCHING COMMAND
Abstract:
Storage circuitry (64) comprises an array (32) of storage locations (34) arranged in rows and columns, a row buffer (36) comprising a plurality of entries (68) each to store information from a storage location at a corresponding column of an active row (46) of the array (32), and comparison circuitry (70) responsive to a tag-matching command specifying a tag value (72) to compare the tag value with information stored in each of a subset of two or more entries (68) of the row buffer (36). The comparison circuitry (70) identifies which of the subset of entries, if any, is a matching entry storing information matching the tag value. This allows memory technologies such as DRAM to be used more efficiently as a set-associative cache.