Bit bus width, Figure 4-11, External – FUJITSU MB91460 SERIES FR60 User Manual
Page 563: A) word access (b) halfword access (c) byte access
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Chapter 31 External Bus
4.Endian and Bus Access
●
32-bit bus width
Figure 4-10 External bus Access for 32-Bit Bus Width
●
16-bit bus width
Figure 4-11 External bus Access for 16-Bit Bus Width
32bit
01
(1)
LSB
MSB
00
01
(1)
00
10
11
01
(1)
00
10
11
01
(1)
00
10
11
(a) PA1/PA0="00"
→
(1) Output A1/A0="00"
(b) PA1/PA0="01"
→
(1) Output A1/A0="00"
(c) PA1/PA0="10"
→
(1) Output A1/A0="00"
(d) PA1/PA0="11"
→
(1) Output A1/A0="00"
10
11
11
10
01
LSB
MSB
00
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
11
10
01
00
11
10
01
00
11
10
01
00
(a) PA1/PA0="00"
(1) Output A1/A0="00"
(2) Output A1/A0="10"
(b) PA1/PA0="01"
(1) Output A1/A0="00"
(2) Output A1/A0="10"
(c) PA1/PA0="10"
(1) Output A1/A0="00"
(2) Output A1/A0="10"
(d) PA1/PA0="11"
(1) Output A1/A0="00"
(2) Output A1/A0="10"
11
10
00
11
10
01
10
01
00
11
01
00
(a) PA1/PA0="00"
(1) Output A1/A0="00"
(b) PA1/PA0="01"
(1) Output A1/A0="00"
(c) PA1/PA0="10"
(1) Output A1/A0="00"
(d) PA1/PA0="11"
(1) Output A1/A0="00"
(1)
(1)
(1)
(1)
11
10
01
00
11
10
01
00
11
10
01
00
11
10
01
00
(a) PA1/PA0="00"
(1) Output A1/A0="00"
(b) PA1/PA0="01"
(1) Output A1/A0="00"
(c) PA1/PA0="10"
(1) Output A1/A0="00"
(d) PA1/PA0="11"
(1) Output A1/A0="00"
(1)
(1)
(1)
(1)
(A) Word access
(B) Halfword access
(C) Byte access
01
00
11
10