techtom@crash.cts.com (Scott Swazey) (10/19/89)
In the Motorola User's Manual for MC68000 I cannot find a skew specification between the rising edges of !AS and !xDS (data strobes). The Timing diagram seems to indicate simultaneous transition. Is this correct??? Appreciate any hint - thanks. -Scott
mslater@cup.portal.com (Michael Z Slater) (10/22/89)
They don't spec skew between AS and DS. Althought they are shown to be the same on the timing diagram, for true worst-case design you have to assume that the delay from clock to AS is at the minimum, and clock to DS is at the maximum (or vice versa). Obviously, this is overly conservative, but I see no way to pick a "reasonable" but safe value. Anyone from Moto willing to comment? Michael Slater, Microprocessor Report mslater@cup.portal.com