P4022 EM Microelectronic, P4022 Datasheet - Page 12

• Manufacturer Part Number: P4022
• Description: Multi Frequency Contactless Identification Device
• Manufacturer: EM Microelectronic

ROM programming
The P4022 contains three laser fuse ROM blocks
that are pre-programmed by the foundry. Blowing
a laser fuse writes a ZERO into the ROM bit.
CODE ID ROM
This ROM contains the 64 bit ID code. Unless
otherwise specified, the foundry will automatically
program a unique 48 bit ID and 16 bit CRC. In
this case the most significant bit of the ID is
programmed into bit 0 of the ROM, which will be
transmitted first.
SEED ROM
The SEED ROM block contains the 16 bit control
ROM. The 16 bit seed for the on-chip pseudo-
random number generator is pre-programmed by
the foundry into this ROM.
internally and not transmitted.
CONTROL ROM
The operational modes of the P4022 are pre-
programmed into the CONTROL ROM. It must be
specified by the client as a 16 bit unsigned
integer or two unsigned chars (bytes), as shown in
Table 11. The programmable options are listed in
Table 10. This data is used internally and not
transmitted.
Control ROM Map
15
14
EM MICROELECTRONIC-MARIN SA
13
12
Byte[1]
This data is used
11
HF GAP Man-
10
chester
9
8
Data rate
Control ROM Bit definition
Parameter
Fast /
Normal Mode
Free-running
ACK mode
Maximum
initial random
delay
Data rate
Encoding
method
GAP type
7
6
Value
5
0
1
0
1
0
1
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
1
0
1
Random delay
Mode
Normal
Fast
GAP detection enabled
GAP disabled (Free-running)
Slow-down
Switch-off
0 (Continuous)
16 bits
64 bits
256 bits
1 kbits
4 kbits
16 kbits
64 kbits
64 kbit/s
32 kbit/s
16 kbit/s
8 kbit/s
4 kbit/s
2 kbit/s
1 kbit/s
0.5 kbit/s
Glitch encoding
Manchester encoding
Low frequency GAP detection
High frequency GAP detection
4
Byte[0]
3
P4022
PRELIMINARY
Switch-
off
2
running
Free-
Table 10
Table 11
1
Fast
12
0