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| 型号： | HCS473PROM |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | IC EEPROM SPI BUS 32KBIT 8-SOIC |
| 中文描述： | 跳码编码器和转发器 |
| 文件页数： | 28/68页 |
| 文件大小： | 1629K |
| 代理商： | HCS473PROM |
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HCS473
DS40035C-page 26
Preliminary
2002 Microchip Technology Inc.
3.2.3.3
IFF CHALLENGE AND RESPONSE
The HCS473 can perform a 16-bit or 32-bit challenge
and response (IFF) based on the K
EE
L
OQ
encryption
algorithm.
The transponder reader follows the 3-bit IFF command
with one of four possible options indicating a 16 or 32-
bit challenge and whether to use the encoder or tran-
sponder crypto key to create the response (Table 3-5).
The 3-bit option is followed by the appropriate 16 or 32-
bit challenge; typically a random number. The
sequence ends with a CRC calculated over the com-
mand, option and challenge bits, (Figure 3-14).
The HCS473 encrypts the challenge using the desig-
nated crypto key and responds with a 32-bit result. The
reader authenticates the response by decrypting it and
verifying it matches the original challenge.
If 16-bit IFF is selected, the 32-bit response consists of
two copies of the 16-bit challenge.
RFRSP determines if the response will be transmitted
on the DATA pin. If enabled, the response will follow the
selected Encoder mode code hopping format with the
hopping code replaced with the 32-bit response. The
transmissions will contain a button code of ‘0000’.
LFRSP determines if the response will be transmitted
on the LC pins. The LC pin response will be the 32-bit
result, modulated PPM format.
If both RFRSP and LFRSP are enabled, the HCS473
will send the response on the DATA pin immediately fol-
lowed by the PPM response on the LC pins. Refer to
Section 3.2.1.7 for further response path details.
The next command must begin T
CMD
after the
response.
FIGURE 3-14:
IFF SEQUENCE (RF RESPONSE EXAMPLE)
T
SF
ACK
CMD
OPT
CHAL
T
CMD
‘010
2
’ 3 bits
16/32
bits
CRC
2 bits
T
IFF
RESPONSE
‘
‘
‘
b
b
L
M
b
Option
Command
M
L
C
C
CRC
T
FINH
P
H
I
(
F
T
IFF
RF Response (RFRSP=1)
b
b
16/32-Bit
Challenge
b
M
L
Optional Next
Command
T
CMD
with consecutive command
or if waiting for LF response
Wake Sequence
or
Previous Command
Response
Inductive In
(LC Pins)
RF Response
(DATA Pin)
T
CMD
T
CMD
M
L
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| HCS473PSQTP | Code Hopping Encoder and Transponder |
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相关代理商/技术参数 |
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|---|---|
| HCS473-PROM | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473PSQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473-PSQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473SLQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
| HCS473-SLQTP | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Code Hopping Encoder and Transponder |
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