Datasheet

13
T5557
4517E–RFID–02/03
Figure 15. T5557 Functional Diagram
T5557 in Extended
Mode (X-mode)
In general, the block 0 setting of the master key (bits 1 to 4) to the value ‘6’ or ‘9’
together with the X-mode bit will enable the extended mode functions.
• Master key = ‘9’: Test mode access and extended mode are both enabled.
• Master key = ‘6’: Any test mode access will be denied but the extended mode is still
enabled.
Any other master key setting will prevent the activation of the T5557 extended mode
options, even when the X-mode bit is set.
Binary Bit-rate Generator In extended mode the data rate is binary programmable to operate at any data rate
between RF/2 and RF/128 as given in the formula below.
Data rate = RF/(2n+2)
Setup modes
Command decode
Write
Number of bits
Password check
Lock bit check
Program & Verify
Modulation defeat
fail data = old
ok data = new
Data verification failed
fail data = old
gap
command mode
fail data = old
Power-on reset
OP(00)
Write
OP(1p)*
OP(01)
Start
Gap
Regular-read mode
addr = 1 .. maxblk
Block-read mode
addr = current
gap
single gap
AOR mode
AOR = 1
AOR = 0
Page 0 or 1
* p = page selector
Direct access OP (1p)*
Page 0
OP (1p)*
OP(10..)
OP(11..)
Page 1
Page 0
Test-mode
if master key <> 6
Reset
to page 0