W90P710_05 Datasheet, PDF (45/526 Pages) Winbond – 16/32-bit ARM microcontroller

W90P710
Table 7.2.11 and Table 7.2.12
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 HAL = Address whose LSB is 0,4,8,C
HAU = Address whose LSB is 2,6,A,E
X = Don’t care
nWBE [3-0] / SDQM [3-0] = A means active and U means inactive
Table7.2.11 Half-word access write operation with little Endian
Access Operation
Write Operation (CPU Register Î External Memory)
XD Width
Word
Half Word
Byte
Bit Number
CPU Reg Data
SA
Bit Number
SD
Bit Number
ED
31 0
ABCD
HAL
HAU
31 0
CD CD
31 0
CD CD
31 0
CD CD
31 0
CD CD
31 0
ABCD
HA
31 0
CD CD
31 0
CD CD
31 0
ABCD
HA
31 0
CD CD
70
D
31 0
CD CD
70
C
XA
HAL
HAL
HA
HA
HA+1
nWBE [3-0] /
SDQM [3-0]
Bit Number
XD
Bit Number
Ext. Mem Data
Timing Sequence
UUAA
31 0
CD CD
15 0
CD
AAUU
31 0
CD CD
31 16
CD
XXAA
15 0
CD
15 0
CD
XXXA
70
D
70
D
1st write
XXXA
70
C
70
C
2nd write
Table7.2.12 Half-word access read operation with Little Endian
Access Operation
Read Operation (CPU Register Í External Memory)
XD Width
Word
Half Word
Byte
Bit Number
CPU Reg Data
SA
Bit Number
SD
Bit Number
ED
XA
15 0
CD
HAL
15 0
CD
15 0
CD
HAL
15 0
AB
HAU
15 0
AB
15 0
AB
HAL
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 [3-0]
Bit Number
XD
Bit Number
Ext. Mem Data
Timing Sequence
UUAA
AAUU
31 0
AB CD
31 0
AB CD
31 0
ABCD
XXAA
15 0
CD
15 0
CD
XXXA
70
D
70
D
1st read
XXXA
70
C
70
C
2nd read
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Publication Release Date: January 17, 2005
Revision A.2