The time needed from the point where !MREQ is asserted and the data must be stab

Question

The time needed from the point where !MREQ is asserted and the data must be stable before it is read can be calculated two ways from the table. Calculate the time needed using both calculations for a 100MHz bus. If the memory needs 15 msec for this measurement, how many wait states are needed to read from the memory on a 100MHz bus? Calculate the time needed using both calculations for a 200MHz bus. If the memory needs 15 msec for this measurement, how many wait states are needed to read from the memory on a 200MHz bus?

Explanation / Answer

Solution :

2) Time needed for 100MHz is upto 3.5 ns.

1) Wait states which are neede to read 100MHz, if memory has 15ns = 100 / 15 = 6.67 states.

2) Time needed for 200MHz is upto 4.2 ns.

1) Wait states which are neede to read 200MHz, if memory has 15ns = 200 / 15 = 13.34 states.

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