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參數(shù)資料
| 型號： | MLX90111 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 128bit Read Write Transponder |
| 中文描述： | 128位讀寫應答 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 148K |
| 代理商： | MLX90111 |
MLX90111
128bit Read Write Transponder
MLX90111 128bit Read Write Transponder
Page 7 of 12
Rev 1.12 5-Feb-01
2. Operating Modes
2.1 Continuous/critical read mode (ID)
In read mode, the transponder transmits its ID
code to a transceiver by amplitude modulating
(AM) the envelope of the carrier coming from the
transceiver. The 128 bits of the ID are
Manchester or Biphase encoded.
After POR the device will enter 'normal' read
mode. The ID will be read out under optimal
conditions. After programming any word of the
ID, the device will automatically enter 'critical'
read mode. The data is read at the 2 extremes
of the reading window. When both readings are
identical, the data retention is guaranteed as
specified (Tret, Ncyc). If the two critical readings
show a difference, the device is at its minimum
coupling with the transceiver and it should be
reprogrammed using a stronger field.
Critical read mode can only be reset by
removing the transponder from the RF field.
2.2 Programming mode
Upon receiving an Asynchronous Control
Pattern (ACP), the device enters program mode
and waits during a Watchdog Delay period
(TWD), for the start bit of the programming
sequence.
The programming sequence consists of a start
bit, and a 32 bit command. The command starts
with a 3bit Command Field (CMF), a 4bit
address, an odd parity bit calculated over the
address, a 16bit data word and an 8bit CRC
calculated over the full command.
If the programming sequence is received, the
write access, parity and CRC are verified and
command is executed if possible, else the
transponders goes back into normal read mode.
In case the command has been executed, the
transponder waits again for a Watchdog Delay
period TWD for a new programming command.
In case of a timeout the device starts sending
the ID code in critical read mode, until removal
from the RF field.
Minimum field strength for reliable programming is
set by the minimum induced e.m.f. Vacee on the
transponder coil.
2.3 Programming commands
Two Command Fields are defined:
CMF
CMF1
Code
001
Action
- Write ID words: addresses 0…7,
- Read address 8,9,10
- Write address 8,9,10
CMF2
000
To write data, the respective CMF and address
are sent out. If the write access, parity and CRC
are verified, the data are written in the EEPROM
at the specified location. For 2kbaud devices
EEPROM programming takes 20ms, for 4kbaud
devices programming is done in 10ms.
To read the data in addresses 8, 9 and 10 CMF1
is used.
- address 11 for reading the configuration word.
- address 12 for reading the tuning (bit positions
14 to 10) and the configuration (bit positions 0 to
1) bits, see the memory map.
If the parity and CRC are verified, the data is
sent out during the time window normally
allocated for the EEPROM programming. Data
is sent with a start bit of bit (!) time first,
followed by twice the 16-bit data word, with
critical read levels. The startbit allows to detect
a leading 0 in Manchester coding, and allows the
microcontroller to synchronize. Remark that this
startbit is different from the start bit sent by the
reader, which is a full bit.
HINT: In case the reader requires more time to
switch from write to read mode, the dummy data
should be chosen such that the last CRC bits
are 1, i.e. in Return to Zero code: no modulation
needed on the reader antenna. This way the
time for switching the reader can be extended.
2.3 Parity, CRC
PAR is an odd Parity bit is calculated over the 4-
bit address
The 8-bit CRC with polynomial u
8
+ u
4
+ u
3
+ u
2
+
u
0
is calculated over the complete command
string [CMF-ADDRESS-PAR-DATA].
3
5
4
6
7
2
0
1
x
Exclusive OR
Register Stage
u
8
u
4
u
3
u
2
LSB
MSB
Data
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