Rainbow Electronics W90P710CDG - Manual (Page 42)

W90P710CD/W90P710CDG
- 42 -
Table6.2.7 Byte access write operation with Big Endian
ACCESS
OPERATION
WRITE OPERATION (CPU REGISTER Î EXTERNAL MEMORY)
XD WIDTH WORD HALF WORD BYTE
Bit Number
CPU Reg Data
31 0
ABCD 31 0
ABCD 31 0
ABCD
SA BA0 BA1 BA2 BA3 BAL BAU BA
Bit Number
SD
31 0
D D D D
31 0
D D D D
31 0
D D D D
31 0
D D D D
31 0
D D D D
31 0
D D D D
31 0
D D D D
Bit Number
ED
31 24
D
23 16
D
15 8
D
7 0
D
15 8
D
7 0
D
7 0
D
XA BA0 BA0 BA0 BA0 BAL BAL BA
nWBE [3-0] /
SDQM [3-0]
AUUU UAUU UUAU UUUA XXAU XXUA XXXA
Bit Number
XD
31 0
D X X X
31 0
X D X X
31 0
X X D X
31 0
X X X D
15 0
D X
15 0
X D
7 0
D
Bit Number
Ext. Mem Data
31 24
D
23 16
D
15 8
D
7 0
D
15 8
D
7 0
D
7 0
D
Timing Sequence
Table6.2.8 Byte access read operation with Big Endian
ACCESS
OPERATION
READ OPERATION (CPU REGISTER Í EXTERNAL MEMORY)
XD WIDTH WORD HALF WORD BYTE
Bit Number
CPU Reg Data
7 0
A
7 0
B
7 0
C
7 0
D
7 0
C
7 0
D
7 0
D
SA BA0 BA1 BA2 BA3 BAL BAU BA
Bit Number
SD
7 0
A
7 0
B
7 0
C
7 0
D
7 0
C
7 0
D
7 0
D
Bit Number
ED
7 0
A
15 8
B
23 16
C
31 24
D
7 0
C
15 8
D
7 0
D
XA BA0 BA0 BA0 BA0 BAL BAL BA
SDQM [3-0] AUUU UAUU UUAU UUUA XXAU XXUA XXXA
Bit Number
XD
31 0
ABCD 31 0
ABCD 31 0
ABCD 31 0
ABCD 15 0
CD
15 0
CD
7 0
D
Bit Number
Ext. Mem Data
31 0
ABCD 15 0
CD
7 0
D
Timing Sequence