Production Specification

07/03/02

B roa dcom Co rpo rat ion

Document

5802-DS03-405-R

Memory Structures

Table 20:

ModRem Command Context (C = M mod N)

Table 21:

Table 22:

The selection of IPsec crypto/authentication operation versus IPsec key setup operation can be made on a per MCR basis.

Within one MCR, no mix of crypto/authentication and IPsec key setup operations is allowed. The mode the current MCR

operates on is determined by which DMA register the MCR address is written into. If it is written into the first DMA register

(Master Command Record 1), then the chip performs crypto/authentication operations. If it is written into the fifth DMA

register (Master Command Record 2), then the chip performs key setup operations.

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

8

7

6

5

4

3

2

1

0

Operation Type

Modular Reduction Operation(0x46)

Total Command Context Structure Length

Modulus N Length

Message M Length

Modulus N (512, 768, 1024 bits, 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

8

7

6

5

4

3

2

1

0

Operation Type

Modular Exponentiation Operation(0x47)

Total Command Context Structure Length

Modulus N Length

Exponent E Length

Modulus N (512, 768, 1024 bits, 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

8765

4321

0

Operation Type

Modular Inverse Operation(0x48)

Total Command Context Structure Length

Modulus N Length

Reserved

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

……

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

Exponent N-2 (512, 768, 1024 bits, lowest word)

……

Exponent N-2 (512, 768, 1024 bits, highest word)