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參數(shù)資料
| 型號： | E5551A-DIT |
| 英文描述： | Transponder |
| 中文描述： | 轉(zhuǎn)發(fā) |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 157K |
| 代理商： | E5551A-DIT |
e5551
Rev. A2, 19-Apr-00
4 (21)
Memory
The memory of the e5551 is a 264 bit EEPROM, which
is arranged in 8 blocks of 33 bits each. All 33 bits of a
block, including the lock bit, are programmed simulta-
neously. The programming voltage is generated on-chip.
Block 0 contains the mode data, which are not normally
transmitted (see figure 6).
Block 1 to 6 are freely programmable. Block 7 may be
used as a password. If password protection is not required,
it may be used for user data.
Bit 0 of every block is the lock bit for that block. Once
locked, the block (including the lockbit itself) cannot be
field-reprogrammed.
Data from the memory is transmitted serially, starting
with block 1, bit 1, up to block ‘MAXBLK’, bit 32.
‘MAXBLK’ is a mode parameter set by the user to a value
between 0 and 7 (if maxblk=0, only block 0 will be trans-
mitted).
Block 7
Block 6
Block 5
Block 4
Block 3
Block 2
Block 1
Block 0
User data or password
32 bits
User data
Configuration data
132
0
L
Not transmitted
Figure 5. Memory map
Direct
Manchester
Biphase
PSK1
PSK2
PSK3
Direct
FSK1, 1a
FSK2, 2a
From memory
To load
Carrier frequency
Mux
Figure 6. Modulator block diagram
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