Repairing Advanced-Memory Buffer (AMB) with redundant memory buffer for repairing DRAM on a fully-buffered memory-module
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United States of America Patent
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Jan 6, 2009
Grant Date -
Jul 10, 2008
app pub date -
Mar 21, 2008
filing date -
Jul 24, 2006
priority date (Note) -
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Abstract
A repairing fully-buffered memory module can have memory chips with some defects such as single-bit errors. A repair controller is added to the Advanced Memory Buffer (AMB) on the memory module. The AMB fully buffers memory requests that are sent as serial packets over southbound lanes from a host. Memory-access addresses are extracted from the serial packets by the AMB. The repair controller compares the memory-access addresses to repair addresses and diverts access from defective memory chips to a spare memory for the repair addresses. The repair addresses can be located during testing of the memory module and programmed into a repair address buffer on the AMB. The repair addresses could be first programmed into a serial-presence-detect electrically-erasable programmable read-only memory (SPD-EEPROM) on the memory module, and then copied to the repair address buffer on the AMB during power-up.
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