W90N745CD Datasheet, PDF (40/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
Table 6.2.11 and Table 6.2.12
Using little-endian and half-word access, Program/Data path between register and external memory.
HA = Address whose LSB is 0,2,4,6,8,A,C,E X = Don’t care
nWBE [1-0] / SDQM [1-0] = A means active and U means inactive
Table 6.2.11 Half-word 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
SA
Bit Number
SD
Bit Number
ED
31 0
ABCD
HA
31 0
CD CD
31 0
CD CD
31 0
CD CD
70
D
31 0
ABCD
HA
31 0
CD CD
70
C
XA
HA
HA
HA+1
nWBE [1-0] /
SDQM [1-0]
Bit Number
XD
Bit Number
Ext. Mem Data
Timing Sequence
AA
15 0
CD
15 0
CD
XA
70
D
70
D
1st write
XA
70
C
70
C
2nd write
Table 6.2.12 Half-word access read operation with Little Endian
ACCESS OPERATION
XD Width
READ OPERATION (CPU REGISTER Í EXTERNAL MEMORY)
Half Word
Byte
Bit Number
CPU Reg Data
SA
Bit Number
SD
Bit Number
ED
XA
15 0
CD
HA
15 0
CD
15 0
CD
HA
15 0
XD
HA
15 0
CD
HA
15 0
CD
15 0
CD
HA+1
SDQM [1-0]
Bit Number
XD
Bit Number
Ext. Mem Data
Timing Sequence
AA
15 0
CD
15 0
CD
XA
70
D
70
D
1st read
XA
70
C
70
C
2nd read
Publication Release Date: September 22, 2006
- 35 -
Revision A2