Samsung S3C2500B User Manual page 498

DES/3DES
PADDR
PENABLE
PSELx
S
PWRITE
Y
S
T
E
PWDATA
M
B
PRDATA
U
S
DESIN
FIFO
PW
DATA
DESOUTFI
FO
PR
DATA
11-2
PWDATA
Register
write sig.
Add
decode
Control
Status
Status
des_mode
Interrupt
wr_indata
enable
iv
Input
IV/indata
buffer
register
Output outdata
register
buffer
3/2 cycle
2 cycle
Figure 11-1. DES/3DES Block Diagram
keygen
key1
key
key2
key3
FSM
in_mode
(state
sig.
machine)
desctrl
FSM
in_mode
(state
sig.
machine)
dreg64
1 cycle 20/60(DES/3DES) cycle
1/2 cycle
DES/3DES
key48
exp
left side data
left side data
sbox
left side data
right side
data
pbox
left side data
S3C2500B