Semiconductor memory device with auto refresh to specified bank

Details Semiconductor memory device with auto refresh to specified bank Semiconductor memory device with auto refresh to specified bank

2006-12-05

2006-12-05

Elms, Richard (Department: 2824)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S230080, C365S233100

Reexamination Certificate

active

07145828

ABSTRACT:
Method and apparatus for use with multi-bank Synchronous Dynamic Random Access Memory (SDRAM) circuits, modules, and memory systems are disclosed. In one described embodiment, an SDRAM circuit receives a bank address to be used in an auto-refresh operation, and performs the auto-refresh operation on the specified bank and for a current refresh row. When all bank addresses have been supplied for the current row, the SDRAM circuit updates the current refresh row and repeats the process. This process can allow a memory controller to modify an auto-refresh bank sequence as necessary such that auto-refresh operations can proceed on some memory banks concurrently with reads and writes to other memory banks, allowing better utilization of the SDRAM circuit. Other embodiments are described and claimed.

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patent: 2006/0018174 (2006-01-01), Park et al.
patent: 2006/0044912 (2006-03-01), Kim et al.

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