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DRAM & Controller (2).

DRAM controller is typically coupled with a cache or at least a write buffer.

DRAM: high latency and write back overhead dictate preference for large burst operations.

It is best if clients make available several operations for processing at once: up to number of banks.

It is best if clients can tolerate responses out of order.

Controller must

Controller might contain a tiny CPU to interrogate serial device data.

DRAM refresh overhead has minimal impact on bus throughput.

(C) 2008-10, DJ Greaves, University of Cambridge, Computer Laboratory.