s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 156

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

SYSTEM MANAGER
Table 4-11 and 4-12
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
HAU=Address whose LBS is 2, 6, A, E
CAS3-0/nWBE3-0=0 means active and 1 means inactive
4-14
Bit Num.
CPU Register Data
CPU Address
Bit Num.
CPU Data Bus
Bit Num.
Internal SD Bus
External Address
CAS3-0/nWBE3-0
Bit Num.
XDATA
Bit Num.
Ext. Memory Data
Timing Sequence
Bit Num.
CPU Register Data
CPU Address
Bit Num.
CPU Data Bus
Bit Num.
Internal SD Bus
External Address
CAS3-0/nWBE3-0
Bit Num.
XDATA
Bit Num.
Ext. Memory Data
Timing Sequence
Ext. Memory Type
Ext. Memory Type
Table 4-11. Half-Word Access Store Operation with Little-Endian
Table 4-12. Half-Word Access Load Operation with Little-Endian
XXXX
1100
abcd
abcd
cdcd
cdcd
cdcd
cdcd
cdcd
HAL
31 0
31 0
HAL
31 0
15 0
HAL
31 0
31 0
HAL
31 0
31 0
cd
Word
Word
STORE (CPU Reg
abcd
31 0
15 0
LOAD (CPU Reg
cd
XXXX
31 16
0011
abab
abab
abcd
HAU
cdcd
cdcd
cdcd
HAU
HAL=Address whose LSB is 0, 4, 8, C
31 0
31 0
HAL
31 0
31 0
31 0
HAL
31 0
X=Don't care
cd
Half word
Half word
XXXX
XX00
abab
abab
abcd
cdcd
cdcd
31 0
31 0
31 0
15 0
15 0
15 0
31 0
31 0
15 0
15 0
HA
HA
HA
HA
cd
cd
ab
ab
ab
External Memory)
External Memory)
1st write
1st read
XXXX
XXX0
XaXa
XaXa
cdcd
cdcd
31 0
31 0
31 0
31 0
7 0
7 0
7 0
7 0
HA
HA
d
d
a
a
31
Byte
Byte
15 0
abc
HA
HA
ba
d
2nd write
2nd read
0
XXXX
HA+1
XXX0
HA+1
cdcd
cdcd
baba
baba
31 0
31 0
31 0
31 0
7 0
7 0
7 0
7 0
b
b
c
c
S3C4510B