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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