Analog Devices SHARC ADSP-21368 User Manual

ADSP-21368 SHARC Processor Hardware Reference 3-23
External Port
Bus Hold Cycles
The processor is able to insert bus hold and read hold cycles by setting bits
in the AMI control register (AMICTLx). These two methods for holding off
data processing are described below.
• Bus hold cycle (
HC bits 13–11) is an inactive bus cycle that the pro-
cessor automatically generates at the end of a read or write to allow
a longer hold time for address and data. Programs may disable
holds, or hold off processing for one or more external port proces-
sor cycles.
• Read hold cycle (RHC bits 20–18) is the delay between two reads at
the end of a read access. Programs may disable the read hold cycle,
or hold the address for one or more external port clock cycles.
Figure 3-4. Idle Cycle Example, Wait State = 2
12 34 5
SDCLK
ADDRESS 23
- 0
MSx
RD
WR
DATA 31
- 0
READ IDLE WRITE
6

Analog Devices SHARC ADSP-21368 Specifications

General

Brand	Analog Devices
Model	SHARC ADSP-21368
Category	Computer Hardware
Language	English