CHAPTER 4 BUS CONTROL FUNCTION
90
User’s Manual U15195EJ5V0UD
(3) Word access (32 bits)
(a) When the bus width is 16 bits (little endian) (1/2)
<1> Access to address 4n
1st access
2nd access
7
0
7
0
Word data
15
8
External
data bus
4n
Address
15
8
4n + 1
23
16
31
24
7
0
7
0
Word data
15
8
External
data bus
4n + 2
Address
15
8
4n + 3
23
16
31
24
<2> Access to address 4n + 1
1st access
2nd access
3rd access
7
0
7
0
Word data
15
8
External
data bus
Address
15
8
4n + 1
23
16
31
24
7
0
7
0
Word data
15
8
External
data bus
4n + 2
Address
15
8
4n + 3
23
16
31
24
7
0
7
0
Word data
15
8
External
data bus
4n + 4
Address
15
8
23
16
31
24
Содержание PD703114
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