5802-DS01-R datasheet(36/50 Pages) BOARDCOM

36 / 50 page

■ BCM5802

Production Specification

07/03/02

B roa dcom Co rpo rat ion

Page 28 Memory Structures

Document

5802-DS03-405-R

Table 17:

ModAdd Command Context (C = (A+B) mod N)

Table 18:

ModSub Command Context (C = (A-B) mod N)

Table 19:

ModMul Command Context (C = A*B mod N)

MSB

LSB

31 30 29 28 27 26 25 24 23

22 21 20 19 18 17 16 15 14 13 12 11 10 9

Operation Type

Modular Addition Operation (0x43)

Total Command Context Structure Length

Modulus N Length

Reserved

Modulus N (512, 768, 1024 bits, lowest word)

Modulus N (512, 768, 1024 bits, 2nd lowest word)

……

Modulus N (512, 768, 1024 bits, highest word)

MSB

LSB

31 30 29 28 27 26 25 24 23

20 19 18 17 16 15 14 13 12 11 10

9876543210

Operation Type

Modular Subtraction Operation (0x44)

Total Command Context Structure Length

Modulus N Length

Reserved

Modulus N (512, 768, 1024 bits, lowest word)

Modulus N (512, 768, 1024 bits, 2nd lowest word)

……

Modulus N (512, 768, 1024 bits, highest word)

MSB

LSB

31 30 29 28 27 26 25 24 23

22 21 20 19 18 17 16 15 14 13 12 11 10 9

Operation Type

Modular Multiplication Operation(0x45)

Total Command Context Structure Length

Modulus N Length

Reserved

Modulus N (512, 768, 1024 bits, lowest word)

Modulus N (512, 768, 1024 bits, 2nd lowest word)

……

Modulus N (512, 768, 1024 bits, highest word)

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