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參數(shù)資料
| 型號(hào)： | EM4469V3WW11 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 512 bit Read/Write Contactless Identification Device |
| 中文描述： | 512位讀/寫非接觸式識(shí)別裝置 |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大?。?/td> | 305K |
| 代理商： | EM4469V3WW11 |
EM4469
Copyright
2003, EM Microelectronic-Marin SA
6
www.emmicroelectronic.com
co
20:
In case this bit is set to logic 1 the EEPROM
programming by using Write Word command is
protected. In order to write any word using Write Word
command a Login Flag has to be set.
Write login
co
21:
In case this bit is set to logic 1 the programming of
Housekeeping words by using Write Word command is
protected. In order to write any Housekeeping word using
Write Word command a Login Flag has to be set.
Please note that writing to Password word is always
protected by password.
Write Housekeeping login
co
22:
In the case this bit is set to logic 1 the word just written
by Write Word command is read before EM4469
transitions back in Default Read mode.
Please note that since reading from Password word is
not possible this is the only possibility to read back the
password just written.
Read After Write
co
23:
In case this bit is set to logic 1 Disable command is
accepted.
Disable
co
24:
In case this bit is set to logic 1 there is no modulation in
Default Read, EM4469 operates in Reader Talk First
(RTF) mode. In this mode communication is done only
using commands.
RTF
co
25
- co
31:
Reserved for future use
Organisation of Protection Word
The Protection word protects EEPROM words from being
written.
The bits in protection word are one time programmable
(OTP) which means that once they have been set to 1
they can not be reset to 0 any more.
Every EEPROM word is protected by a bit pair in
Protection word. State 00 of the pair means that the word
is not protected, state 11 means write protection. 01 and
10 states are not allowed. Due to the OTP feature of bits
in Protection word a word once protected becomes read
only and can not be reverted back to RW. Please note
that it is possible to protect the Protection word itself, in
that case the protection system is locked and cannot be
changed any more.
Bit
Word
pr
0
pr
1
pr
2
pr
3
pr
30
pr
31
W
0
W
1
W
15
Table above presents the location of bit pair protecting a
certain word. Bits pr
0
and pr
1
protect word 0, bits pr
2
and
pr
3
word 1 and so on.
The protection bits of RO words 0 and 1 are already
factory programmed to 1.
EEPROM Delivery State
As already mentioned above, in all cases the words 0
and 1 are factory programmed and locked.
In the case a Customer code is attributed, the content of
other words can be personalised according to customer
wish.
In case of default configuration with Customer code 1
Password, Configuration word and user free words are
all set to 0, the protection bits of RO words 0 and 1 are of
course factory programmed to 1, other protection bits are
also set to 0.
Register name
Customer code
Data rate
Encoder
PSK carrier
frequency
Last default read
word
Read Login
Read
Housekeeping
login
Write login
Write
Housekeeping
login
Read After Write
Disable
LSB.. ..MSB
1000000000
011111
1000
00
Comments
RF/64 (2Kbaud)
Manchester
f
RF
/2 (not used in
this case)
Last word read is at
address 15
No login required
No login required
1111
0
0
0
0
No login required
No login required
0
0
No read after write
Disable command is
not accepted
TTF mode
(modulation active)
RTF
0
All reserved and
unused bits
0
Default Read
After the supply voltage crosses the POR threshold, the
circuit enters Power-up Initialisation in which it reads
Configuration word and then transitions in Default Read
mode according to configuration just read.
In Default Read mode the chip will continuously send
data starting from word 5 and finishing with word LWR.
After sending last bit (31) of word LWR readout continues
without interruption with first bit of word 5. In the case
word 5 is set as LWR only word 5 is repeated.
Forward Link Communication
(Reader to Tag)
As already mentioned commands can be send from
reader to tag by initiating a command while chip is in
Default read. The communication is done by using 100%
modulation of reader field (also called field stops or
OOK).
The first field stop initialise Command mode. Since it can
happen while modulator switch is OFF it needs to be long
enough to stop oscillation on coil terminals for at least
T
MONO
.
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