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參數(shù)資料
| 型號： | EM4170A5CI2LB |
| 英文描述： | Multi-Purpose Precision Multiphase PWM Controller With Optional Active Voltage Positioning; Temperature Range: -40°C to 85°C; Package: 20-QFN |
| 中文描述： | 模擬雜項 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大小： | 142K |
| 代理商： | EM4170A5CI2LB |
EM4170
Copyright
2002, EM Microelectronic-Marin SA
7
www.emmicroelectronic.com
Authentication
In this mode the chip first receives the 56 bits of random number followed by a certain number of divergency bits that the
reader should send as "0" followed by 28 Bits of cipher_1 (f(RN)) as authentication of the lock. The chip decides if the
authentication is accepted. In this case the EM4170 sends a header (12 Manchester coded '1's followed by 4 Manchester
coded '0's). Next 20 Bits of cipher_2 (g(RN)) are sent. Else it sends a single NAK. Upon completion of this command the
EM4170 returns to Standby Mode.
Begin
Receive
f(RN)
(28 Bits)
Divergency
Send
g(RN)
(20 Bits)
End
Y
N
Send
header
Send
NAK
Receive
RN
(56 Bits)
f(RN)
valid?
Fig. 7
OUTPUT
INPUT
RM
RN
f(RN)
Tdiv
g(RN)
Tauth
LIW
Header
LIW
Command
“0000000”
Fig. 8
Write Word
The Write Word command is followed by the address and data. The address consists of a 5 bit block containing 4 data bits
and 1 even parity. The data consists of 4 times 5 bit blocks, each block consisting of 4 data bits and 1 associated even
parity bit. One additional block consists of 4 column parity bits and a trailing zero (refer to fig 10).
Address
A3 A2 A1 A0 Padd
Data
D15 D14 D13 D12 P3 D11 D10 D09 D07 P2 D07 D06 D05 D04 P1 D03 D02 D01 D00 P0 PC3 PC2 CP1 PC0 "0"
Fig. 9
First bit received
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| EM4170A5WS7 | 制造商:EMMICRO 制造商全稱:EM Microelectronic - MARIN SA 功能描述:125kHz CRYPTO READ/WRITE Contactless Identification Device |
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