Modular memory system with shared memory access

专利名称：Modular memory system with shared

memory access

发明人：Michael Bermingham,Christopher S.

Maclellan,Rizwan Sheikh

申请号：US08/995188申请日：19971222公开号：US05956288A公开日：19990921

摘要：A modular memory array configuration uses a combinatorial decoding device(decoder), instead of straight buffering, to effect optimal delivery of control and addresssignals. Each port accessing memory on the array drives a single copy of address andcontrol signals, plus bank select signals, over a shared interface to the decoder. Bankselect controls the decoder which drives the address and control to only the accessedbank. Address and control signals to all banks but the accessed bank, are pulled up(inactive) with resistors on the memory array. For N banks, log2 N bank select bits areneeded. The decoder device does not need to be clocked and therefore avoids problemsassociated with selecting between and providing asynchronous or redundant clocks for amulti-ported shared memory with ports independent of and asynchronous to oneanother. Output glitches on the output control signals are avoided by having the portcontroller performing a memory access first switch the bank select signals while all otherinputs are stable and logically inactive. The bank select value is maintained for theduration of the memory access, while the other inputs may switch. Pin requirements forport controllers and memory array connectors are minimized. Simultaneous switching

output noise on both the port controllers and memory array address/control drivers isalso minimized.

申请人：EMC CORPORATION

代理人：Brian L.Brown Rudnick Freed & Gesmer, PC Michaelis

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