參數(shù)資料
型號: VMS115
元件分類: 加密電路
英文描述: TELECOM, DATA ENCRYPTION CIRCUIT, PQFP100
封裝: MQFP-100
文件頁數(shù): 13/64頁
文件大小: 572K
代理商: VMS115
VLSI Technology, a subsidiary of Philips Semiconductors
8/10/99
20
Revision: 2.3
906
Data Sheet
x = ~n0 + 1;
k = 1;
pwr1 = 2;
pwr2 = 1;
for (i=2; i < 32; i++)
{
pwr1 = pwr1 << 1;
pwr2 = pwr2 << 1;
if (((x*k) % pwr1) < pwr2)
k = k;
else
k =k + pwr2;
}
pwr2 = pwr2 << 1;
if ( (x*k) < pwr2 )
k = k;
else
k = k + pwr2;
return (k);
}
5.2.2.2
Control and Status Register
The Control/Status register provides the command interface to an external processor.
Bit 31:8
Reserved
Bit 7
Done - State Machine Finished - This bit reports the completion of a function oper-
ation. The value of this bit corresponds to the interrupt output pin value.
Bit 6
Exponent - Exponentiate - Writing a one to this bit begins exponentiation. The
exponentiation state machine uses the A, B, N, and E values.
Bit 5:0
Reserved
Control/Status Register
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Done
Exponent
Reserved
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