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CHAPTER 4 BUS INTERFACE
4.4
Bus Operation
This section describes the bus operation based on the following topics:
• Relationship between data bus width and control signals
• Big-endian bus access
• Little-endian bus access
• Comparison of external access
I Relationship between data bus width and control signals
The relationship between the data bus width and control signals is described for the following
bus interface:
•
Normal bus interface
I Big-endian bus access
External access is described based on the following topics:
•
Data format
•
Data bus width
•
External bus access
•
Example of a connection with external devices
I Little-endian bus access
External access is described based on the following topics:
•
Differences between little-endian and big-endian mode
•
Data format
•
Data bus width
•
Examples of connection with external devices
I Comparison of external access in big-endian and little-endian mode
Word access, half word access, and byte access are described for the various bus widths to
compare external access in big-endian and little-endian mode.
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