參數資料
型號: L64780
廠商: LSI Corporation
英文描述: DVB-T COFDM Demodulator(對地數字視頻廣播 正交編碼頻率分割多路處理解調器)
中文描述: 的DVB - T COFDM解調器(對地數字視頻廣播正交編碼頻率分割多路處理解調器)
文件頁數: 47/126頁
文件大?。?/td> 953K
代理商: L64780
MUXIN Interface
3-11
In this mode, you can select whether the COFDM symbol number comes
from the TPS informations (Frame Number) or from the MUXINBUS
(S_NB). This selection is done through the AFC_MODE bit (address 0x5,
bit 6). If AFC_MODE = 0, the COFDM symbol number comes from the
MUXINBUS (S_NB) or full MUXIN mode; otherwise, it comes from the
TPS register (partial MUXIN mode).
3.2.3 Access to the FFT Block
In this mode, the CLKMUXIN signal is configured as a 36 MHz clock
(more precisely, eight times the low IF).
The signals on the bus are I and Q data (in two’s complement format)
and a start pulse (START). These signals are mapped on the
MUXINBUS. See
Figure 3.18
.
In this mode, the L64780 can be used as a stand-alone FFT processor
in forward mode (FFT_DIR = 0) or in inverse mode (FFT_DIR = 1). The
FFT_DIR register is located at address 0x11, bit 2.
3.2.4 Access to the CSI Block
The CSI block performs the Channel State Information (CSI) processing,
which builds the soft decisions for the Viterbi decoder using a priori
information from the Channel Equalizer (CE). In this mode, CLKMUXIN
is configured as an 18 MHz clock (more precisely: four times the low IF).
The signals on the bus are I and Q data (in twos complement format), a
start pulse (START), a data valid (DV) signal, the COFDM symbol
number (S_NB), and a marker (or data valid) on scattered pilots (DVSP).
These signals are mapped on the MUXINBUS. See
Figure 3.19
.
Figure 3.18 FFT Input Mapping
26
25
24
21
20
11 10
9
0
0
START
0
Q[9:0]
0
I[9:0]
Figure 3.19 CSI Input Mapping
26
25
24 23 22 21
11 10
0
DVSP
START DV S_NB
Q[10:0]
I[10:0]
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