Hi all, There is a situtation in my controller when tRAS(max) is exceeded. My controller starts to read out from some row but I am not sure exactly which one. Does anyone know what row will be opened under this situation? Thanks Subhasri.K
tRAS is defined as 'ACTIVE to PRECHARGE command' in a typical Micron datasheet
As a row can maintain itself only so long before being refreshed (the purpose of precharge being part of the refresh system), it can only be accessed without a precharge for some maxima. If you exceed that maxima, you will not change the row, you will simply get invalid data.
Bottom line is - meet the tRAS spec.
Note that the datasheet I mention above has full simulation models freely available at the Micron website:
Verilog, VHDL, IBIS, HSPICE, Denali and Synopsis are all available.
Cheers
PeteS
Thanks for the ideas both of you.
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