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

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

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