S2-LP datasheet(58/90 Pages) STMICROELECTRONICS

58 / 90 page

Packet handler engine

S2-LP

58/90

DocID029944 Rev 1

Each pair of encoded symbols corresponding to one single encoded bit is packet into a

single matrix cell. For each encoded symbols pair so(n) is transmitted first on air, s1(n) is

transmitted second.

Note that interleaving is always enabled together with FEC for the Basic and STack packet

formats while it can be optionally enabled in the case of the 802.15.4g packet format by

setting to ‘1’ the INT_EN_4G register.

7.8.2

Manchester coding

Manchester coding can be enabled for the Basic and STack packet formats only by setting

to ‘1’ the MANCHESTER_EN register.

Use of Manchester coding is exclusive with FEC and Three-out-of-six coding.

When Manchester coding is enabled each bit ‘1’ is actually transmitted on air as a ‘01’

sequence while a bit ‘0’ is transmitted as a ‘10’ sequence. If enabled, Manchester encoding

is applied to all bits following the SYNC word.

7.8.3

3-out-of-6 coding

The 3-out-of-6 coding is a form of block coding that can be enabled for the Basic packet

format for compatibility with the MBUS standard setting to ‘1’ the MBUS_3OF6_EN bit of

PCKTCTRL2. This coding is not expected to be used in other packet formats and is

exclusive with FEC and Manchester coding.

Coding is done according to the table below.

Table 54: 3-out-of-6 coding scheme

NRZ code

NRZ-decimal

6-bit code

6-bit decimal

N. of transitions

0000

010110

0001

001101

0010

001110

0011

001011

0100

011100

0101

011001

0110

011010

0111

010011

1000

101100

1001

100101

1010

100110

1011

100011

1100

110100

1101

110001

1110

110010

1111

101001

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