Invention Grant
- Patent Title: System cache with partial write valid states
- Patent Title (中): 具有部分写入有效状态的系统缓存
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Application No.: US13629196Application Date: 2012-09-27
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Publication No.: US09218286B2Publication Date: 2015-12-22
- Inventor: Sukalpa Biswas , Shinye Shiu
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Agent Rory D. Rankin
- Main IPC: G06F12/08
- IPC: G06F12/08

Abstract:
Methods and apparatuses for processing partial write requests in a system cache within a memory controller. When a write request that updates a portion of a cache line misses in the system cache, the write request writes the data to the system cache without first reading the corresponding cache line from memory. The system cache includes error correction code bits which are redefined as word mask bits when a cache line is in a partial dirty state. When a read request hits on a partial dirty cache line, the partial data is written to memory using a word mask. Then, the corresponding full cache line is retrieved from memory and stored in the system cache.
Public/Granted literature
- US20140089602A1 SYSTEM CACHE WITH PARTIAL WRITE VALID STATES Public/Granted day:2014-03-27
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