參數(shù)資料
型號(hào)： MA28140
廠商： Dynex Semiconductor Ltd.
英文描述： Packet Telecommand Decoder
中文描述： 包遙控解碼器
文件頁(yè)數(shù)： 20/72頁(yè)
文件大?。?/td> 857K
代理商： MA28140
MA28140
20/72
CHANGE PROGRAMMABLE KEY BLOCK CONTROL
COMMANDS A AND B
Two such Control Commands are provided to cover the full
size of the Programmable Key:
- Command A concerns the first 256 octet boundaries.
- Command B concerns the last 112 octet boundaries.
It is possible to load a 5-octet (40 bits) block starting from
any of the 368 octet boundaries. Any transmission using the
unused boundaries of Command B (from 113 to 255) is
ignored and reported as non-executable. The key used for
authenticating the TC Segment containing one of these
Control Commands will be whatever key was selected in the
AU at the time each Control Command was received. Once the
TC Segment has been authorized by the authentication
process, the TC Segment, minus the 40-bit signature s (i.e.
[m,l]) is complemented and passed once more through the
signature-building process, i.e. through the Authentication
Processor. The 24 bits of virtual fill z are inserted as before,
i.e., they are not complemented, but remain all zeros. The
result of the process is a 40-bit pseudo-signature which,
instead of being sent to the Signature Comparator, is loaded in
the Programmable Key memory, starting at the octet location
indicated by the start address field, as follows:
- Bits 32 through 39 of pseudo-signature at the indicated
octet location;
- Bits 24 through 31 of pseudo-signature at the next
location (start address + 1);
- And so on, until Bits 0 through 7 are loaded at location
start address + 4.
Any arbitary procedure can be used for changing the key,
starting from any of the 368 octet boundaries.
Figure 9: Organisation of the Programmable Key Memory
W0 (40 to 47)
40
47
000
200
W0 (32 to 39)
32
39
001
201
W0 (24 to 31)
24
31
002
202
W0 (16 to 23)
16
23
003
203
W0 (8 to 15)
8
15
004
204
W0 (0 to 7)
0
7
005
205
W1 (40 to 47)
40
47
006
206
W1 (32 to 39)
32
39
007
207
W42 (16 to 23)
16
23
255
2FF
W42 (8 to 15)
8
15
000
300
W59 (0 to 7)
0
7
103
367
C (59 to 56)
59
56
104
368
C (55 to 48)
55
48
105
369
C (47 to 40)
47
40
106
36A
C (39 to 32)
39
32
107
36B
C (31 to 24)
31
24
108
36C
C (23 to 16)
23
16
109
36D
C (15 to 8)
15
8
110
36E
C (7 to 0)
7
0
111
36F
RAM
Mapping
Address provided in the
Control command (decimal)
B
B
Note: Bit 0 is the MSB
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