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C251: WHY SHOULD I USE PAGE MODE?

QUESTION

Why should I use page mode?

ANSWER

Page mode provides faster access to external memory.

Typically, as you execute instructions from external program memory (EPROM), instruction fetches read addresses sequentially. Since the upper address lines do not change as frequently as the lower address lines, the upper address byte is not re-latched until it changes. This means that data fetches faster because ALE doesn't toggle as much.

We have seen performance increases of about 29% between page mode and non-page mode using our 251 board.

Last Reviewed: Monday, June 7, 2004


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