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Architecture: Bus and Device Structure

Transmitting data consumes energy and causes delay. Basic physical parameters:

Need to use protocols that are tolerant to registers (4P H/S degrades with reciprocal of delay).

(Die stacking and recent DRAM-on-SoC approaches reduce wire length to a few mm for up to 500 MB of DRAM.)

But first let's revisit the simple hwen/rwen system used in the `socparts' section.


6: (C) 2008-18, DJ Greaves, University of Cambridge, Computer Laboratory.