297
Bus and Memory Control (BCU, MEMC)
Chapter 7
Preliminary User’s Manual U17566EE1V2UM00
(2)
Halfword access (16 bits)
(a) Little endian
Figure 7-23
Left: Access to even address (2n)
Right: Access to odd address (2n + 1)
(b) Big endian
Figure 7-24
Left: Access to even address (2n)
Right: Access to odd address (2n + 1)
7
0
7
0
Halfword
data
15
8
External
data bus
Address
7
0
7
0
Halfword
data
15
8
External
data bus
2n + 1
Address
2n
1-st Access
2-nd Access
1-st Access
2-nd Access
7
0
7
0
Halfword
data
15
8
External
data bus
Address
7
0
7
0
Halfword
data
15
8
External
data bus
2n + 2
Address
2n + 1
1-st Access
2-nd Access
1-st Access
2-nd Access
7
0
7
0
Halfword
data
15
8
External
data bus
2n
Address
7
0
7
0
Halfword
data
15
8
External
data bus
2n + 1
Address
7
0
7
0
Halfword
data
15
8
External
data bus
2n + 1
Address
7
0
7
0
Halfword
data
15
8
External
data bus
2n + 2
Address
electronic components distributor