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參數(shù)資料
| 型號(hào)： | MLX90111 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 128bit Read Write Transponder |
| 中文描述： | 128位讀寫應(yīng)答 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 148K |
| 代理商： | MLX90111 |
MLX90111
128bit Read Write Transponder
MLX90111 128bit Read Write Transponder
Page 10 of 12
Rev 1.12 5-Feb-01
Coding schemes
Manchester
For a “1” bit, there is a transition from 0 to 1 in
the middle of the bit period. Reciprocal, for a “0”
logic bit there is a transition from 1 to 0 in the
middle of the bit period.
Biphase
At the beginning of each bit, a transition will
occur. A logic bit “1” will keep its state for the
whole bit duration and a logic bit “0” will show a
transition in the middle of the bit duration.
Return to One
This encoding is used to modulate the reader
antenna to send the commands to the
transponder.
For a “0” bit, there is a transition to 0 in the
beginning of the bit period. In the middle of the
bit period the state returns to 1.
For a “1” bit, the level remains high for the entire
bit period.
Flow Chart.
Upon entering the RF field, the transponder
"sees" increasing amplitude of the voltage
between COIL and GND pins. It passes through
a POR sequence, and enters the normal read
mode, transmitting the ID continuously.
If the reader sends an asynchronous control
pattern (ACP), the transponder enters program
mode. It receives an address, parity, a 16-bit
data word and a CRC.
When a write command has been successfully
received, the word is stored at the given
address. When a word of the ID is written, the
critical read flag will be set. This flag can only
be reset by removing the transponder from the
electromagnetic field.
When a read command for addresses #B
(WPW) or #C (tune-bits, speed and code) has
successfully been received, the transponder
immediately
sends
information, once critical high and once critical
low.
If no new programming pattern is received
during the Watchdog Delay period (TWD), the
transponder checks the critical read flag and
enters the appropriate read mode.
back
the
requested
X
0
1
1
0
1
0
0
Binary Data
Modulation Output
1
1
0
0
Memory Output
Biphase Code
X
1
1
1
1
0
1
0
Binary Data
Modulation Output
1
1
0
0
Memory Output
Manchester Code
X
1
1
1
1
0
1
0
Binary Data
Modulation Output
1
1
0
0
Binary form
Return to One
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