Avoiding Bus Contention - Analog Devices Blackfin ADSP-BF537 Hardware Reference Manual

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Figure 21-3. Interface to 16-Bit SRAM

Avoiding Bus Contention

Because the three-stated data bus is shared by multiple devices in a system,

be careful to avoid contention. Contention causes excessive power dissipa-

tion and can lead to device failure. Contention occurs during the time one

device is getting off the bus and another is getting on. If the first device is

slow to three-state and the second device is quick to drive, the devices

There are two cases where contention can occur. The first case is a read

followed by a write to the same memory space. In this case, the data bus

drivers can potentially contend with those of the memory device addressed

by the read. The second case is back-to-back reads from two different

memory spaces. In this case, the two memory devices addressed by the two

reads can potentially contend at the transition between the two read

ADSP-BF537 Blackfin Processor Hardware Reference

ADDR[N + 1:2]

System Design