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1. (WO2006122932) METHOD TO HANDLE WRITE MASK IN DRAM MEMORY

Pub. No.:    WO/2006/122932    International Application No.:    PCT/EP2006/062344
Publication Date: Nov 23, 2006 International Filing Date: May 16, 2006
IPC: G11C 7/10
Applicants: INTERNATIONAL BUSINESS MACHINES CORPORATION
IBM UNITED KINGDOM LIMITED
GANFIELD, Paul, Allen
HASELHORST, Kent, Harold
JOHNS, Charles, Ray
LIU, Peichun, Peter
Inventors: GANFIELD, Paul, Allen
HASELHORST, Kent, Harold
JOHNS, Charles, Ray
LIU, Peichun, Peter
Title: METHOD TO HANDLE WRITE MASK IN DRAM MEMORY
Abstract:
A method, an apparatus, and a computer program product are provided for the handling of write mask operations in a DRAM memory system. This invention eliminates the need for a two-port array because the mask generation is done as the data is received. Less logic is needed for the mask calculation because only 144 of the 256 possible byte values are decoded. The mask value is generated and stored in a mask array. Independently, the write data is stored in a write buffer. The mask value is utilized to generate a write mask command. Once the write mask command is issued, the write data and the mask value are transmitted to a multiplexer. The multiplexer masks the write data using the mask value, so that the masked data can be stored in the DRAMS.