ATA559001-6DSY Atmel, ATA559001-6DSY Datasheet - Page 60

• Manufacturer Part Number: ATA559001-6DSY
• Description: RF Wireless Misc UHF (1k bit r/w anti-collision)
• Manufacturer: Atmel

Specifications of ATA559001-6DSY

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.4
8.4.1
60
Address Field
ATA5590
Error Handling: Address Unknown
Table 8-10.
Additional address information is transmitted via bits (5:3), the 8-bit address field which follows
the parameter field, or both.
To shorten the communication time, the system supports a symbolic addressing mechanism.
When using the address bits of the parameter fields, only value(2:0) is used.
Table 8-11.
The address of page and block can be transmitted by command name or inside the forward
stream as a part of the parameter, address field, or both.
The address field is used by long commands in combination with long addressing modes to
point to the EEPROM (read and program commands).
The pointer-based anticollision and group-selection commands (Group_p, Group_p_leeq,
Group_p_greq, and Anticollision_pointer) use this byte to point to a bit which was addressed by
the page address transmitted via the parameter field.
The size of the address field is 8 bits. Therefore, an address space of 32 Kbits of user memory
and 32 Kbits of control memory can be addressed via read and program commands. ATA5590
uses only the lower 3 bits to point to page addresses. The other bits are ignored, but it is recom-
mended to set them to “0” for compatibility with future IC derivatives.
If the command is known and accepted by the tag, but the tag is not able to support the address
information, the tag signals this by backscattering a sub-carrier during the first bit of the return
link header.
Additionally, it stops backscattering the detected data during the CRC field of the forward link.
During the rest of the return link, the tag does not backscatter any other information to the
reader.
Symbolic Addresses
Tag_ID
User system information
Manufacturer system information
Addressing
mode(1:0)
11
10
01
00
Encoding of the Addressing Modes Stored in the Parameter Field
Supported Symbolic Addresses
Addressing Mode
Symbolic address,
short
Symbolic address,
long
Physical address
mode, short
Physical address,
long
Comment
The lower three bits of the 4-bit symbolic address are stored in
the parameter field. The block address points to the MSBlock of
the page. The third bit is emulated as 0.
Four bits of the symbolic address are stored in the address field.
A block address can be transmitted within the parameter field.
Three bits are set in the parameter field. The other address bits
are automatically set to “0”. The third bit is emulated as “0”.
The page address is stored in the 8-bit address field.
The block address is transmitted within the parameter field.
Value(3:0)
0000
0001
0010
4817C–RFID–03/07