ATA557001C-DDB Atmel, ATA557001C-DDB Datasheet - Page 8

• Manufacturer Part Number: ATA557001C-DDB
• Description: IC IDIC SENSOR RW 1KBIT DIE
• Manufacturer: Atmel
• Series: -r

Specifications of ATA557001C-DDB

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

4.4
4.5
Figure 4-2.
8
Block-read Mode
Atmel e5550 Sequence Terminator
Atmel ATA5570C
No terminator
Regular read mode
ST = on
Read Data Stream with Sequence Terminator
Sequence terminator
With the direct access command, the addressed block is repetitively read only. This mode is
called block-read mode. Direct access is entered by transmitting the page access opcode
(“10” or “11”), a single “0” bit, and the requested 3-bit block address, when the tag is in normal
mode.
In password mode (PWD bit set), the direct access to a single block needs the valid 32-bit
password to be transmitted after the page access opcode, whereas a “0” bit and the 3-bit block
address follow afterwards. In case the transmitted password does not match with the contents
of block 7, the ATA5570C tag returns to the regular-read mode.
Note:
The sequence terminator (ST) is a special damping pattern which is inserted before the first
block and may be used to synchronize the reader. This Atmel
terminator consists of four bit periods with underlaying data values of “1”. During the second
and the fourth bit period, modulation is switched off (if Manchester coding is activated, then
modulation is switched on). Bi-phase modulated data blocks need fixed leading and trailing
bits in combination with the sequence terminator to be reliably identified.
The sequence terminator may be individually enabled by setting mode bit 29 (ST = “1”) in the
Atmel e5550-compatibility mode (X-mode = “0”).
In the regular-read mode, the sequence terminator is inserted at the start of each MAX-
BLK-limited read data stream. In block-read mode, after any block-write or direct access
command, or if MAXBLK was set to “0” or “1”, the sequence terminator is inserted before the
transmission of the selected block.
This behavior is different from former Atmel e5550-compatible ICs (Atmel T5551, Atmel
T5554).
Block 1
A direct access to block 0 of page 1 will read the configuration data of block 0, page 0.
A direct access to block 3 to 7 of page 1 reads all data bits as zero.
Block 1
Block 2
Block 2
MAXBLK
MAXBLK
Sequence terminator
Block 1
Block 1
Block 2
®
e5550-compatible sequence
Block 2
9191B–RFID–05/11