ATA555811C-DDB Atmel, ATA555811C-DDB Datasheet - Page 9

• Manufacturer Part Number: ATA555811C-DDB
• Description: IC IDIC 1KBIT R/W DIE
• Manufacturer: Atmel

Specifications of ATA555811C-DDB

• Function: Read/Write
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.8
Figure 2-7.
3. Transmission Protocol
4681E–RFID–11/09
Downlink Data Rate
Notes:
R = reserved for future use, should be set to '0'
x = don't care state
* ) see Master Key section
Master Key * )
0 = Unlocked
1 = Locked
Lock Bit
(DDR)
Tag Configuration Register
Configuration Register
L
31 30 29 28
0
MSB...
1 1
The internal tag configuration register holds a shadow copy of the configuration settings stored
in the system memory’s block 63. It is refreshed after every POR cycle (RF field on), Reset to
Ready or Write to block 63.
The transmission protocol defines the mechanism to exchange commands and data between
the interrogator and the tags. In all but the Public and EAS Mode, the interrogator has complete
control over the communication flow – all data transmission being synchronized to interrogator
commands and the interrogator field clock – “Interrogator Talks First” (ITF) principle. This means
that a tag does not transmit data, unless it has received and properly decoded an interrogator
command.
The protocol is based on an exchange of
Operating
x 0
0 1
1 1
Mode * )
• commands from the interrogator to the tag (Downlink mode)
• and response from the tag to the interrogator (Uplink mode)
0
27 26 25 24
R R
= ITF
= PM
= EAS
0 0 0
0 0 1
.
.
1 1 1
( bit periods )
23 22 21 20
Preamble
.
.
Length
p2
SOF
.
.
p1 p0
= 1
= 2
= 8
.
.
19 18 17 16
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Length
TagID
ITF =Interrogator Talks First Mode
PM = Public Mode (Tag Talks First - TTF)
EAS = Electrical Article Surveillance
NRZ = Non Return to Zero
n4 n3 n2 n1 n0
= 16 bit
= 32 bit
= 48 bit
= 64 bit
= 80 bit
= 96 bit
= 40 bit
= 56 bit
Data Bit Rate
RF/2(n+1)
15 14 13 12
Uplink
11 10 9 8
R
R
Encoding
0 0
0 1
1 0
1 1
Uplink
1 = Downlink CRC check
7 6 5 4
mandatory
= Manchester
= NRZ (Direct Coding)
= FDX-B (Biphase)
= Reserved
0 0
ATA5558
a4 a3
Max. Block
3 2 1 0
a2 a1 a0
...LSB
9