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參數(shù)資料
| 型號： | STLC1510 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | NorthenLite G.lite DMT Transceiver |
| 中文描述： | NorthenLite G.lite大唐收發(fā)器 |
| 文件頁數(shù)： | 14/40頁 |
| 文件大?。?/td> | 426K |
| 代理商： | STLC1510 |
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STLC1510
14/40
I
Software programmable generation of the flag
TX_CLAV (CeLl AVailable, TX direction) via
registers. This translates to the FIFO having a
software programmable depth.
I
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:
I
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
supported:
and
are
I
I
Furthermore
R S
I
is integer,
I
the combination
allowed, while not required.
I
byte wise coding over
N
FEC
and
is
,
I
and hence
.
The Reed-Solomon Code Wordlength is
, and
its value results from the selection of
and
, and
the number of data bytes
per Data Frame, where-
by
for
downstream,
or
for upstream. The RS Data Word
length is
and the RS Code Word length is
The code word istransmitted over
and hence the number of bytes per Data Frame is
DMT symbols,
The Galois Field primitive element
the zero of the primitive polynomial
is defined by
The Reed-Solomon generator polynomial is
R
1
–
∑
The RS encoder does not introduce latency. RS de-
coding has a latency of at least
per bound of the latency is given by the actual
decoder implementation.
The transmitter and receiver provide synchronization
of the RS Code Words.
, whereby the up-
5.4 Bit Mapper/Demapper Module (MAP)
5.4.1 Features
I
G.992.2 Compliant constellation encoder, up to
15 bits per sub-carrier capability.
I
Support for 1-bit per sub-carrier modulation
(BAM) and idle sub-carriers.
I
Constellation encoder, Q1.15 complex fixed
point output.
I
Bit unpacking and packing from/to 256-byte
data frame.
I
Support for pilot tone insertion.
I
Support for REVERB, SEGUE and MEDLEY
generation.
I
Support for random 4-QAM generation.
I
No trellis coding.
I
Implemented as a peripheral device.
S
R
R
S
0 4 8 16
1 2 4 8 16
=
=
S
1
>
D
1
=
GF 256
255
)
≤
N
FEC
S
R
B
B
2
…
48
…
144
=
B
1
…
16
…
60
=
K
FEC
S
B
1
+
(
)
=
N
FEC
K
R
+
=
S
B
’
N
S
--------------
B
1
+
R
S
---
+
=
=
α
p x
x
8
x
4
x
3
x
2
1
+
+
+
+
=
G x
x
α
k
+
(
)
k
0
=
=
N
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