On 13/01/2014 23:02, Uncle Peter wrote:


Given that commercial stuff is NOt enigeneered tpo 'worst case' but
generally engineered to 99.99% chance' level, it's surprsng that stuff
works as well as it does.

You could always buy RAM rated much faster than you're going to run it.


Not always..
sometimes the designer will use the minimum hold time for the ram to
allow them to change the address to start the next cycle early.
If the ram is too fast the output will change too soon and put the CPU
into a metastable state.
Then anything could happen.