In the context of DRAM timing, what is a pseudomaximum. What DRAM parameter is a pseudomaximim? What are the implications of a pseudomaximum for design engineers?
What will be an ideal response?
The pseudomaximum is a rather unusual concept. The prefix pseudo means false and it is a false maximum in the sense in the sense that it is not really a maximum and can, in fact, be longer. A pseudomaximum is a value whose maximum value is the least large value possible. You can use larger values but that is not necessary. In
everyday life, the price we pay for things is a pseudomaximum; if a book costs $10 that is its lowest high price (you can pay more than $10 if you really want to, but it you do, you are throwing money away).
In a DRAM, the parameter tRCD (see below) which is the time between RAS* low and CAS* low has a minimum value and a pseudomaximum. The pseudomaximum is given by the time for the address hold following RAS* low, plus the time to multiplex the address from row to column plus the column address setup time before CAS* low.
The implication of a pseudomaximum is that you can exceed it, but if you do you are throwing away speed by waiting longer than is strictly necessary.
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