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)： 15/64頁
文件大?。?/td> 572K
代理商： VMS115
VLSI Technology, a subsidiary of Philips Semiconductors
8/10/99
22
Revision: 2.3
906
Data Sheet
stored. The reset/default value of this pointer is 0011.
Bit 11:8
Nptr [3:0] - N Pointer - The location in the main memory where the N value is
stored. The reset/default value of this pointer is 0010.
Bit 7:4
Bptr [3:0] - B Pointer - The location in the main memory where the B value is
stored. The reset/default value of this pointer is 0001.
Bit 3:0
Aptr [3:0] - A Pointer - The location in the main memory where the A value is
stored. The reset/default value of this pointer is 0000.
5.2.2.5
Operand RAM
The Operand RAM is partitioned into four 32-word segments used to store the A, B, N and E val-
ues. The Pointer Register is used to identify which segment is used for which variable (A, B, N or
E).
The Exponentiator expects the bytes within the 32-bit words to be stored big endian (MSB at the
lower address). The words are arranged wtihin the memory space in little endian format (LSW is
stored at the lowest address space. This memory space is word addressable only.
Operand RAM Configuration
MSB
LSB
0x081
MSB
LSB
0x09F
..
.
MSB
LSB
0x080
Least Significant Word
MSB
LSB
0x0BF
..
.
MSB
LSB
0x0A0
MSB
LSB
0x0A1
MSB
LSB
0x0DF
..
.
MSB
LSB
0x0C0
MSB
LSB
0x0C1
Most Significant Word
MSB
LSB
0x0FF
..
.
MSB
LSB
0x0E0
MSB
LSB
0x0E1
S
egm
ent
1
S
egm
ent
2
S
egm
ent
3
S
egm
ent
4
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