9 mode register, 10 modulator, 11 memory – Rainbow Electronics ATA5577 User Manual
Page 4: Ata5577 [preliminary

4
4967DS–RFID–10/08
ATA5577 [Preliminary]
4.9
Mode Register
The mode register maintains a readable shadow copy of the configuration data held in block 0 of
the EEPROM. It is continually refreshed during read mode and (re-)loaded after every POR
event or reset command. On delivery, the mode register is pre-programmed with default values
(see full version of the datasheet).
4.10
Modulator
The modulator encodes the serialized EEPROM data for transmission to a tag reader or base
station. Several types of modulation are available including Manchester, bi-phase, FSK, PSK,
and NRZ.
4.11
Memory
The memory is a 363-bit EEPROM, which is arranged in 11 blocks of 33 bits each. Each block
includes a single Lock bit, which is responsible for write-protecting the associated block. Pro-
gramming takes place on a block basis, so a complete block (including lock bit) can be
programmed with a single command. The memory is subdivided into two page areas. Page 0
contains 8 blocks and page 1 contains 4 blocks. All 33 bits of a block, including the lock bit, are
programmed simultaneously.
Figure 4-2.
Memory Map
0
1.........................................................................................32
Pa
g
e
1
L
Analog front end option set-up
Block 3
1
Traceability data
Block 2
1
Traceability data
Block 1
L
Page 0 configuration data
Block 0
Pa
g
e
0
L
User data or password
Block 7
L
User data
Block 6
L
User data
Block 5
L
User data
Block 4
L
User data
Block 3
L
User data
Block 2
L
User data
Block 1
L
Configuration data
Block 0
32 bits
Not transmitted