HOME       UP       PREV       FURTHER NOTES       NEXT (Basic bus: Multiple Initiators (II).)  

Basic Bus: One initiator (II).

Basic bus illustration: one initiator and three targets.

No tri-states are used: address and write data outputs use wire joints or buffers, read data uses multiplexors.

There is only one initiator, so no bus arbitration is needed.

Max throughput is unity (i.e. one word per clock tick).

Typical SoC bus capacity: 32 bits × 200 MHz = 6.4 Gb/s, but owing to protocol degrades with distance.

The interrupt wiring is not shown. If device 1 is a processor, it might have a dedicated interrupt wire from each other device.

49: (C) 2008-13, DJ Greaves, University of Cambridge, Computer Laboratory.