Table of Contents
Advertisement
Chapter 7
302
Downloaded from
Elcodis.com
electronic components distributor
7.8.2 Access to 16-bit data busses
This section shows how byte, half word and word accesses are performed for a
16 bit data bus.
Access all data in order starting from the lower order side.
(1)
Byte access (8 bits)
(a) Little endian
15
8
7
7
0
0
Byte data
External
data bus
Figure 7-33
Left: Access to even address (2n)
Right: Access odd address (2n + 1)
(b) Big endian
15
8
7
7
0
0
Byte data
External
data bus
Figure 7-34
Left: Access to even address (2n)
Right: Access to odd address (2n + 1)
Preliminary User's Manual U17566EE1V2UM00
Bus and Memory Control (BCU, MEMC)
Address
2n
Address
2n
Address
15
2n + 1
8
7
7
0
0
Byte data
External
data bus
Address
15
8
7
7
2n + 1
0
0
Byte data
External
data bus
Advertisement
Table of Contents
