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HCS410 датащи(PDF) 26 Page - Microchip Technology

номер детали HCS410
подробное описание детали  KEELOQ짰 Code Hopping Encoder and Transponder
PDF  36 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

HCS410 датащи(HTML) 26 Page - Microchip Technology

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HCS410
DS40158E-page 26
Preliminary
 2001 Microchip Technology Inc.
4.4
IFF Decoder Operation
In a typical IFF decoder, the key generation on the
decoder side is done by reading the serial number from
a token and combining that with the manufacturer’s
code to recreate the encoder key that is stored on the
token. The decoder polls for the presence of a token.
Once detected the decoder reads the serial number. If
the token has been learned, the decoder sends a chal-
lenge and reads the token’s response. The decoder
uses the encoder key stored in EEPROM and decrypt
response. The decrypt response is compared to the
challenge. If they match the appropriate output is acti-
vated.
FIGURE 4-7:
TYPICAL IFF DECODER
OPERATION
FIGURE 4-8:
BASIC OPERATION OF AN IFF RECEIVER (DECODER)
Start
Token
Detected?
Read Serial
Does
Serial Number
Match?
Send Challenge
and Read
Decrypt the
Response
Does
Challenge &
Match?
Execute Command
No
No
No
Yes
Yes
Yes
Response
Number
Decrypt response
IFF Key
Serial Number
KEELOQ
IFF
Algorithm
Decrypted
EEPROM Array
Manufacturer
Code
Serial Number
Response
Check for
Match
Response
Written to HCS410
Challenge
Information read from HCS410



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