ATA5558_09 Datasheet, PDF (24/52 Pages) ATMEL Corporation – 1 kbit R/W IDIC with Deterministic Anticollision

Table 6-1. Anti-collision Timing
Parameter
Remark
Tag reaction time
End of start gap to start of tag
command processing
Tag to Interrogator response End of final command gap to
time
start of Tag SOF
Symbol
T_IR
T_Tag
Anticollision Aknowledge
response time
Anticollision final zero bit
response time
End of Interrogator acknowledge
gap to start of Tag SOF
T_ack
Overlap of final zero bit and SOF T₀
Formular Formular
d₁₁ max + 65 × T_c
(See Table 3-1 on page 12)
DDR = 1
DDR = 0
134 × T_c
138 × T_c
½ × T_bit
½ × T_bit
Example:
T_bit = 32 / f_c, d_ref = 24 × T_c
≥ 0 × T_c
DDR = 1
117 × T_c
DDR = 0
145 × T_c
134 × T_c
138 × T_c
16 × T_c
7. Command Set
The first two bits of any interrogator command are called Start Of Command (SOC) and are
always 00. This pulse interval is used for auto calibration purposes. The following series of dual
bit packets define the interrogator command opcodes and the command dependant parameter
information. A command overview is given in Table 7-1 below
Table 7-1.
Command
List of ATA5558 Supported Commands
SOC
Opcode
Number of Parameter bits
Read Single Block
00
01
6 (+ 16 CRC_d)
Read Multiple Blocks
00
01
12 (+ 16 CRC_d)
Write Single Block
00
Login Write
00
Login Read
00
GetID
00
GetID (Tag ID-part, even) 00
01
01 11 01 11 10
01 11 01 10 10
00 00
00 00
40 (+ 16 CRC_d)
32
32
None
Length of partial Tag ID
GetID (Tag ID-part, odd)
00
Select (Tag ID)
00
SelectAll
00
SelectGroup
00
SelectNGroup
00
00 1
00 00
10 00
10 0[0]n 1
10 1[0]n 1
Length of partial Tag ID
Length of Tag ID
None
Length of Tag ID mask
Length of Tag ID mask
ResetSelected
00
11 10 00 00
None
ResetToReady
ArmClear
ClearAll
00
11 00 00 00
00
11 00 10 00
00
01 01 11 11
None
6× 0
34 × 0 (+ 16 CRC_d)
Description
Read single 32 bit data block and CRC_u
(+ optional downlink CRC_d)
Read multiple data blocks and CRC_u
(+ optional downlink CRC_d)
Write a single block
(+ optional downlink CRC_d)
Login for write PWD protected access
Login for read PWD protected access
Starts a complete new anticollision loop
Anticollision loop with partial Tag ID, with
even number of matching Tag ID bits.
Anticollision loop with partial Tag ID, with odd
number of matching Tag ID bits.
Puts specified tag into Selected state
Selects all tags in the RF field
Select a specific group of tags
Select all tags which are NOT members of
the specified group
Reset selected tag to READY state without
reloading configuration register
Reset all tags in the RF field to READY state
and reload configuration register from system
memory (block #63)
Arms tag for ClearAll command
Clears memory except traceability data
(with optional constant CRC_d = 96ADh)
24 ATA5558
4681E–RFID–11/09