V4070 EM Microelectronic, V4070 Datasheet - Page 5

• Manufacturer Part Number: V4070
• Description: Crypto Contactless Identification Device
• Manufacturer: EM Microelectronic

Standby Mode
After a Power-On Reset and upon completion of a
command, the chip will execute the Standby Mode, in
which it will continuously send LIWs to allow the reader
to issue commands. As every LIW has a duration of
160 periods of the RF field the reader can turn to Re-
ceive mode every 1.3ms at 125kHz.
Receive Mode
To change from Standby Mode to another operation
the chip has to be brought into Receive Mode. To do
this the Transceiver sends to the chip the RM pattern
during the 32 clocks of modulated phase in a Listen
Window (LIW). The V4070 will stop sending data upon
reception of a valid RM. The RM pattern consists of 2
bits “0” sent by the transceiver. The first “0” is to be
detected during the 32 periods when the modulation
is “ON” in the LIW.
Next the V4070 expects a command to specify the
operation to be executed.
Commands
The commands are composed of 4 bits, divided into 3
data bits and 1 even parity bit (total amount of “1’s” is
even including the parity bit). There exist 4 different
commands. Upon reception of an unknown command
or a command with wrong parity the chip will immedi-
ately return into Standby Mode.
Memory Map
word 9
8
7
6
5
4
3
2
1
0
Bit15
Crypt Key 95
Bit 31
Crypt Key 79
Crypt Key 63
Crypt Key 47
Crypt Key 31
Crypt Key 15
ID 31
ID 15
LB1,LB0,UM 29
UM 15
EM MICROELECTRONIC-MARIN SA
Crypt Key 32
Crypt Key 80
Crypt Key 64
Crypt Key 48
Crypt Key 16
Crypt Key 0
UM 16
ID 16
UM 0
Bit
0
ID 0
Bit0
Figure 5
ID Mode
After reception of the command including the parity
the chip sends a header consisting of 12 manchester
coded ‘1’s followed by 4 manchester coded ‘0’s. Then
the chip sends the 32 Bits of ID contained in words 3
and 2 of the EEPROM once, without parity, starting
with the MSB of word 3. After completion the chip
returns to Standby-Mode.
UM-MODE
In UM-MODE the chip sends LB1 and LB0 followed
by the 30 Bits of UM starting with the MSB following
the same procedure as in ID-MODE. After completion
the chip returns to Standby Mode.
OUTPUT
INPUT
Commands
ID Mode
Recieved
First bit
COMMAND BITS
0 1 1 0
1 0 1 0
0 0 1 1
0 1 0 1
LIW
Parity bit
RM
Coded Data
Comman
Data
T0 = Period of RF carrier frequency
11111111111100
Header
FUNCTION
1 bit - 32 T0 periods
UM-MODE
AUTHENTICATION
WRITE WORD
ID-MODE
t rID
D31-D
V4070
LIW
Figure 6
Figure 7
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