W90N740CD WINBOND [Winbond], W90N740CD Datasheet - Page 23

• Manufacturer Part Number: W90N740CD
• Description: 32-Bit ARM7TDMI-Based Micro-Controller
• Manufacturer: WINBOND [Winbond]

Table 6.2.5 and Table 6.2.6
Using big-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
HAU = Address whose LSB is 2, 6, A, E
nWBE [3-0] / SDQM [3-0] = A means active and U means inactive
Ext. Mem Data
CPU Reg Data
OPERATION
Bit Number
Bit Number
Bit Number
SDQM [3-0]
Bit Number
Bit Number
XD WIDTH
Sequence
ACCESS
Timing
SA
SD
ED
XA
XD
WORD
Table6.2.4 Word access read operation with Big Endian
31
ABCD
31
ABCD
31
ABCD
31
ABCD
31
ABCD
AAAA
WA
WA
0
0
0
0
0
READ OPERATION (CPU REGISTER
1st read
31
CD XX
XXAA
15 0
15 0
WA
CD
CD
HALF WORD
0
31
CD AB
31
CDAB
WA
0
0
2nd read
31
CD AB
WA+2
XXAA
15 0
15 0
AB
AB
- 20 -
0
W90N740CD/W90N740CDG
D X X X
31
1st read
HAL = Address whose LSB is 0, 4, 8, C
X = Don’t care
XXXA
7 0
7 0
WA
D
D
0
D C X X
2nd read
31
EXTERNAL MEMORY)
WA+1
XXXA
7 0
7 0
C
C
D C B A
31
0
BYTE
31
DCBA
WA
0
D C B X
3rd read
31
0
WA+2
XXXA
7 0
7 0
B
B
0
D C B A
31
4th read
WA+3
XXXA
7 0
7 0
A
A
0