W90N745CD Datasheet, PDF (41/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
Table 6.2.13 and Table 6.2.14
Using little-endian and byte access, Program/Data path between register and external memory.
BA = Address whose LSB is 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
BAL = Address whose LSB is 0,2,4,6,8,A,C,E BAU = Address whose LSB is 1,3,5,7,9,B,D,F
Table 6.2.13 Byte access write operation with little Endian
ACCESS OPERATION
WRITE OPERATION (CPU REGISTER Î EXTERNAL MEMORY)
XD Width
Half Word
Byte
Bit Number
CPU Reg Data
31 0
ABCD
31 0
ABCD
SA
BAL
BAU
BA
Bit Number
SD
Bit Number
ED
31 0
DDDD
70
D
31 0
DDDD
15 8
D
31 0
DDDD
70
D
XA
BAL
BAL
BA
nWBE [1-0] /
SDQM [1-0]
UA
AU
XA
Bit Number
15 0
15 0
70
XD
XD
DX
D
Bit Number
70
15 8
70
Ext. Mem Data
D
D
D
Timing Sequence
Table 6.2.14 Byte access read operation with Little Endian
ACCESS OPERATION
READ OPERATION (CPU REGISTER Í EXTERNAL MEMORY)
XD Width
Half Word
Byte
Bit Number
70
70
70
CPU Reg Data
D
C
D
SA
BAL
BAU
BA
Bit Number
70
70
70
SD
D
C
D
Bit Number
70
70
70
ED
D
C
D
XA
BAL
BAL
BA
SDQM [1-0]
UA
AU
XA
Bit Number
15 0
15 0
70
XD
CD
CD
D
Bit Number
15 0
70
Ext. Mem Data
CD
D
Timing Sequence
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