MA28140 Datasheet, PDF (40/72 Pages) Dynex Semiconductor – Packet Telecommand Decoder

MA28140
The calculation of PW’ gives: PW’ = PW - 1 = 100 - 1 = 99—> 16#63
The value of the ROM at address 003 is: 16#63
The calculation of NW’ gives: NW’ = 256 - NW = 256 - 100 = 156—> 16#9C
The value of the ROM at address 004 is: 16#9B
The authenticated MAP ID is 5 bits long. The 5 LSBs of the ROM value @ address 05 correspond to the authenticated
MAP ID, the 3 MSBs can be either 0 or 1 (0 for example).
The value of the ROM at address 005 is: 16#15
CPDU Packet Header octet 1 contains the following fields:
Version number
: 2#000 in accordance with ref 1
Type
: 1 for CPDU
Data Fields Header flag
: 0 for CPDU
Application Process ID (3 MSBs) : 2#100
The value of the ROM at address 006 is: 16#14
CPDU Packet Header octet 2 contains the following field:
Application Process ID (8 LSBs) : 2#01010110
The value of the ROM at address 007 is: 16#56
The ROM will be programmed as follows:
Address Data
000
03
001
01
002
80
003
63
004
9C
005
15
006
14
007
56
Knapsack and Hashing Key
If the Knapsack key is (example from ref.2 appendix B2)
W0 : 00 01 02 03 04 05
W1 : 06 07 08 09 0A 0B
W59 : 62 63 64 65 66 67
And if the Hashing Key is : C0...C59 A AA AA AA AA AA AA AA
MSB
The ROM will be programmed as follows:
Address Data
200
05
201
04
202
03
203
02
204
01
205
00
206
0B
207
0A
etc
etc
367
62
368
05
369
55
370
55
etc
55
36E
55
36F
55
40/72