P4022 datasheet(12/13 Pages) EMMICRO

12 / 13 page

PRELIMINARY

EMMICROELECTRONIC-MARINSA

P4022

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.

This data is used

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 Bit definition

Parameter

Value

Mode

Fast /

Normal Mode

Normal

Fast

Free-running

GAP detection enabled

GAP disabled (Free-running)

ACK mode

Slow-down

Switch-off

Maximum

0 (Continuous)

initial random

16 bits

delay

64 bits

256 bits

1 kbits

4 kbits

16 kbits

64 kbits

Data rate

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

Encoding

Glitch encoding

method

Manchester encoding

GAP type

Low frequency GAP detection

High frequency GAP detection

Table 10

Control ROM Map

Byte[1]

Byte[0]

HF GAP Man-

chester

Data rate

Random delay

Switch-

off

Free-

running

Fast

Table 11

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