Section 18.7: Memory Mapped I/O (Frame 6)                     [prev][home][next]

Fig. 18.7.3 shows the gates in the decoder of each device which set the activated wires. Each device also has a decoder that determines the specified address that is on the address bus, just as with main memory.


Fig. 18.7.3: Decoder logic for device active wires;
refer to Fig. 18.7.1 for the addresses