W90N740CD WINBOND [Winbond], W90N740CD Datasheet - Page 22

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

Table 6.2.3 and Table 6.2.4
Using big-endian and word access, Program/Data path between register and external memory
WA = Address whose LSB is 0, 4, 8, C
nWBE [3-0] / SDQM [3-0] = A means active and U means inactive
EXT. MEM DATA
CPU REG DATA
BIT NUMBER
BIT NUMBER
BIT NUMBER
BIT NUMBER
BIT NUMBER
NWBE [3-0] /
OPERATION
SEQUENCE
SDQM [3-0]
XD WIDTH
ACCESS
TIMING
SA
SD
ED
XA
XD
WORD
Table6.2.3 Word access write operation with Big Endian
31
ABCD
31
ABCD
31
ABCD
AAAA
31
ABCD
31
ABCD
WA
WA
0
0
0
0
0
WRITE OPERATION (CPU REGISTER
1st write
XXAA
15 0
15 0
15 0
WA
AB
AB
AB
HALF WORD
31
AB CD
31
ABCD
WA
0
2nd write
0
WA+2
XXAA
15 0
15 0
15 0
CD
CD
CD
X = Don’t care
- 19 -
W90N740CD/W90N740CDG
1st write
XXXA
7 0
7 0
7 0
WA
Publication Release Date: September. 19, 2005
A
A
A
2nd write
EXTERNAL MEMORY)
WA+1
XXXA
7 0
7 0
7 0
B
B
B
A B C D
31
BYTE
31
ABCD
WA
0
3rd write
0
WA+2
XXXA
7 0
7 0
7 0
C
C
C
Revision A7
4th write
WA+3
XXXA
7 0
7 0
7 0
D
D
D