W90P710_05 Datasheet, PDF (42/526 Pages) Winbond – 16/32-bit ARM microcontroller

W90P710
Table7.2.6 Half-word access read operation with Big Endian
ACCESS OPERATION
READ OPERATION (CPU REGISTER Í EXTERNAL MEMORY)
XD WIDTH
WORD
HALF WORD
BYTE
Bit Number
CPU Reg Data
15 0
AB
15 0
CD
15 0
CD
15 0
DC
SA
HAL
HAU
HA
HA
Bit Number
SD
Bit Number
ED
15 0
AB
15 0
AB
15 0
CD
15 0
CD
15 0
CD
15 0
CD
15 0
DX
15 0
DC
15 0
DC
XA
HAL
HAL
HA
HA
HA+1
SDQM [3-0]
Bit Number
XD
Bit Number
Ext. Mem Data
Timing Sequence
AAUU
UUAA
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
Table 7.2.7 and Table 7.2.8
Using big-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
BA0 = Address whose LSB is 0,4,8,C BA1 = Address whose LSB is 1,5,9,D
BA2 = Address whose LSB is 2,6,A,E BA3 = Address whose LSB is 3,7,B,F
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