I did a K70 project a few months ago, and somewhere along the line read that the core had single-clock access to the lower internal SRAM and two-clock access to the upper internal SRAM, so I placed certain non-speed critical stuff in upper SRAM. Now I'm starting out on a K64 project, and I don't see any reference to different core access speeds to the two SRAM areas. Furthermore, going back to the K70 docs, I can no longer find it there, either. Did I dream that? Is there or isn't there a performance hit when accessing the upper SRAM area or not?