Semiconductor memory device with mirror function module and using the same
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United States of America Patent
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Sep 15, 2009
Grant Date -
Jul 3, 2008
app pub date -
Jul 16, 2007
filing date -
Dec 28, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A semiconductor memory device with a mirror function enables two memory devices such as two DRAMs to share the same address and control signals. A pair of semiconductor memory devices are mounted on both sides of a substrate to be symmetrical to each other. A mirror function transfers a first transmission signal and a second transmission signal input on respective pads to any one of a mirror “on” path and a mirror “off” path. The mirror function can vary or reduce path delay differences between the mirror function “on” path and the mirror function “off” path by means of the delay and the mixture of phases in the semiconductor memory device, and reduce skew occurred in the operation of the mirror function.
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