Static information storage and retrieval – Addressing – Sync/clocking
Reexamination Certificate
2005-03-01
2005-03-01
Hoang, Huan (Department: 2818)
Static information storage and retrieval
Addressing
Sync/clocking
C365S189050, C365S230040
Reexamination Certificate
active
06862248
ABSTRACT:
A method for masking a ringing in a DDR SDRAM comprises in a write mode, generating first and second synchronizing signals by means of a DQS signal inputted from an exterior circuit, in order to synchronize input data, latching data in odd sequences from among the inputted data, which are sequentially inputted, at a rising edge of the first synchronizing signal, and latching data in even sequences from among the data, which are sequentially inputted, at a rising edge of the second synchronizing signal, aligning the data in odd sequences and the data in even sequences at a falling edge of the DQS signal so that the odd and even sequenced data has the same synchronized timing, and blocking activation of the second synchronizing signal by means of a first control signal, the a first control signal being synchronized with the falling edge of the last valid DQS signal that is normally inputted, so as to enable the blocking step and thereby masking the ringing phenomenon. In the method for masking the ringing phenomenon, the point at which the DIS_DSB signal is enabled in a low state is synchronized with the last falling edge of the normal DQS signal, and therefore the DSF2signal is disabled.
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Hoang Huan
Hynix / Semiconductor Inc.
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