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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)： | 20/40頁 |
| 文件大小： | 426K |
| 代理商： | STLC1510 |
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STLC1510
20/40
5.9 Digital Front End (DFE)
The Digital FrontEnd (DFE)block contains dedicated
hardware to map signals between the analog inter-
face (AFE) and the BPU.
The DFE block has the following features:
I
It performs part of the sampling rate conversion
between the AFE sampling rate and the 2x
symbol rate of the BPU.
I
It provides the necessary digital hardware to
implement an analog-based AGC.
I
It provides the necessary buffering to provide
DMT symbol alignment within the BPU.
I
It provides the facilities to allow timing recovery
in CPE mode. This consists of a digital phase
interpolator and a digital
Σ
D/A convertor
I
Two loopback modes are provided in this block.
I
Various bypass modes are provided to allow
observation and isolation of any block in the
DFE for test purposes.
I
Interface to the LAMBA Bus.
5.9.1 Application Description
Figure 7. shows the application of the various DFE
components when used in a CO (network) and CPE
(remote) applications.
5.9.2 Interface Description
The registers accessible by the EPM are:
I
Decimator oversampling ratio
I
Decimator order.
I
Various loopback and bypass modes.
I
Number of bits transferred to the Aloha ASIC
DAC.
I
AFE control registers.
I
ADC clip counter.
I
RSM parameters such as time constant, peak
detector thresholds, peak detector modes,
integrator initialization, and detector outputs.
I
IIR coefficients.
I
Predictor IIR filter coefficients.
I
Frame synchronization buffer length
I
Timing recovery (crystal) control word.
I
Timing recovery
Σ
dither level selection.
I
CO/CPE mode selection.
I
Phase interpolator parameters such as alpha,
frequency error and frequency error gain.
I
CO peak detector parameters such as set-up
and hold delays, threshold, and slew rate.
Figure 7. DFE Application Diagram
IIR
Interpolating
CSD FIR
IIR
BPU
B PU
A nalo g
D oma in
In terp
C SD
F IR
CIC
Filter
FIFO
FIFO
D AC
4
ADC
D AC
~
ADC
STLC1510 (CO)
STLC1520 (CPE)
DFE
D FE
C IC
Filter
P
h ra
CIC
Filter
CIC
Filter
2
2
~
2
2
RSM
RSM
~
2
1
5
4
~
5
5
5
Σ
optional
PIF
PD
D ly
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