Fujitsu MB91191 Manuale Utente
101
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Width of bus of 16 bits
Figure 4.6-6 External bus access on 16-bit bus width
(A) Word access
MSB
LSB
00
01
00
01
00
01
00
01
10
11
10
11
10
11
10
11
16bit
(B) Halfword access
00
01
00
01
00
01
00
01
10
11
10
11
10
11
10
11
(B) Byte access
00
01
00
01
00
01
00
01
10
11
10
11
10
11
10
11
2) Output A1/A0='10'
1) Output A1/A0='00'
(a) PA1/PA0='00'
2) Output A1/A0='10'
1) Output A1/A0='00'
(b) PA1/PA0='01'
2) Output A1/A0='10'
1) Output A1/A0='00'
(b) PA1/PA0='10'
2) Output A1/A0='10'
1) Output A1/A0='00'
(b) PA1/PA0='11'
(a) PA1/PA0='00'
(b) PA1/PA0='01'
(c) PA1/PA0='10'
(d) PA1/PA0='11'
(a) PA1/PA0='00'
(b) PA1/PA0='01'
(b) PA1/PA0='10'
(d) PA1/PA0='11'
1) Output A1/A0='10'
1) Output A1/A0='10'
1) Output A1/A0='00'
1) Output A1/A0='00'
1) Output A1/A0='00'
1) Output A1/A0='01'
1) Output A1/A0='10'
1) Output A1/A0='11'
MSB
LSB
MSB
LSB