If all the chips are 20 MHz, then why not just drop the lower
    speed grades from the product lineup?

Like they do in the wintel pc market.  Shudder.  Ask an embedded
manufacturer how they feel about components with 6-month lifetimes,
sometime.  Dropping products from a lineup is a a terrible thing to
do, even if the new part is theoretically fully backward compatible.

BillW

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