STLC1510 datasheet(14/40 Pages) STMICROELECTRONICS

14 / 40 page

STLC1510

14/40

Software programmable generation of the flag

TX_CLAV (CeLl AVailable, TX direction) via

registers. This translates to the FIFO having a

software programmable depth.

Software programmable generation of the flag

TX_BP (Back Pressure, TX direction) via

registers. This allows the FIFO to throttle

incoming data flow, while still accepting data

that was already en route when the flag was

asserted.

The Utopia Rx FIFO has the following additional at-

tributes:

Software programmable generation of the flag

RX_CLAV (CeLl AVailable, RX direction) via

registers. This translates to the FIFO having a

software programmable depth.

5.3 Reed Solomon Forward Error Correction

(RS-FEC)

Forward error correction is provided with byte-wise

Reed Solomon (RS) Encoding and Decoding in a 256

element Galois Field.

5.3.1 Parameters

The following parameter values for

and

are

supported:

Furthermore

is integer,

the combination

and

allowed, while not required.

byte wise coding over

and hence

The Reed-Solomon Code Word length is

, and

its value results from the selection of

and

, and

the number of data bytes

per Data Frame, where-

for

downstream,

for upstream. The RS Data Word

length is

and the RS Code Word length is

The code word is transmitted over

DMT symbols,

and hence the number of bytes per Data Frame is

The Galois Field primitive element

is defined by

the zero of the primitive polynomial

The Reed-Solomon generator polynomial is

The RS encoder does not introduce latency. RS de-

coding has a latency of at least

, whereby the up-

per bound of the latency is given by the actual

decoder implementation.

The transmitter and receiver provide synchronization

of the RS Code Words.

5.4 Bit Mapper/Demapper Module (MAP)

5.4.1 Features

G.992.2 Compliant constellation encoder, up to

15 bits per sub-carrier capability.

Support for 1-bit per sub-carrier modulation

(BAM) and idle sub-carriers.

Constellation encoder, Q1.15 complex fixed

point output.

Bit unpacking and packing from/to 256-byte

data frame.

Support for pilot tone insertion.

Support for REVERB, SEGUE and MEDLEY

generation.

Support for random 4-QAM generation.

No trellis coding.

Implemented as a peripheral device.

R0 4 8 16

,, ,

1 2 4816

,, ,,

⁄

G F 256

()

FE C

255

≤

FE C

…48…144

…16…60

FE C

()

⋅

FE C

B’

FE C

---------------

----

()

–

∑

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