发明授权
US5966725A Memory refreshing system having selective execution of self and normal
refresh operations for a plurality of memory banks
失效
具有选择性地执行多个存储体的自身和正常刷新操作的存储器刷新系统
- 专利标题: Memory refreshing system having selective execution of self and normal refresh operations for a plurality of memory banks
- 专利标题(中): 具有选择性地执行多个存储体的自身和正常刷新操作的存储器刷新系统
-
申请号: US852648申请日: 1997-05-07
-
公开(公告)号: US5966725A公开(公告)日: 1999-10-12
- 发明人: Mitsuo Tabo
- 申请人: Mitsuo Tabo
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 优先权: JPX8-117239 19960513
- 主分类号: G06F12/00
- IPC分类号: G06F12/00 ; G06F13/16 ; G11C7/10 ; G11C11/403 ; G11C11/406 ; G06F12/02
摘要:
A memory refreshing system that can dynamically execute a self-refresh operation, even though the computer system is in a normal operational mode and can thus save the power consumption, and includes a memory refreshing system, for a memory system including a plurality of memory banks, which comprises a memory refreshing device, provided in each of the memory banks, for performing a refresh operation within a corresponding memory bank by, e.g., units of rows in response to a refresh request; a first memory refresh controller for supplying a refresh request to the memory system every first time period; a second memory refresh controller, provided for each of the memory banks, for supplying a refresh request to the corresponding memory bank every second time period that is longer than the first time period; a memory access monitor, provided for each of the memory banks, for detecting an access to the corresponding memory bank; a timer, provided for each of the memory banks, for generating a timer output when a first predetermined time has elapsed since a last access to the corresponding memory bank, and for canceling a counted timer value in response to the next access to the corresponding memory bank; and a selector, provided for each of the memory banks, for selecting one of the refresh requests from the first and the second memory refresh control means in accordance with the timer output.
公开/授权文献
- US5160821A Mounting apparatus for a cutting torch 公开/授权日:1992-11-03