System for controlling multiple memory types
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United States of America Patent
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Jan 20, 2004
Grant Date -
N/A
app pub date -
Oct 2, 2001
filing date -
Oct 2, 2001
priority date (Note) -
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Abstract
A system that enables a memory controller to control data transfers with memory modules, such as DIMMs (double in-line memory modules), of either a 'by 4' (.times.4) type or a non-by-4 type (non-.times.4). Both .times.4 and non-.times.4 DIMMs may be used in the system simultaneously, and the memory controller dynamically adjusts its enable and other signals as needed. Data strobe signals are provided to and from DIMMs over a data strobe transfer circuits which in the case of a non-.times.4 DIMM handles data strobes for an entire byte of data, while in the case of .times.4 DIMM the data transfer circuit handles data strobes for one nibble (four bits) of a byte of data. A hybrid data mask/data strobe transfer circuit handles the other nibble of a byte of data in the case of data transfers for .times.4 DIMMs, and handles data mask signals for write operations for non-.times.4 DIMMs.
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