参数资料
型号: L64781
厂商: LSI CORP
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封装: PLASTIC, QFP-100
文件页数: 117/164页
文件大小: 2003K
代理商: L64781
3-16
Interfaces
Figure 3.18 FFT Output Waveform
FFT_STARTOUT_OFF marks all rst complex carriers of an COFDM
symbol (2048 carriers in 2-K mode, 8192 carriers in 8-K mode per
COFDM symbol). FFT_DVTOUT_OFF validates all carriers within an
COFDM symbol.
3.2.3 Equalized-Constellation (CE) Output Mode
When the channel output interface is in Equalized-Constellation (CE)
output mode, MUXOUT_SELECT = 010 and the logical mapping is done
as follows:
PCLKOUT = CLK36
BCLKOUT = I_Q_SEL
XCTR_OUT[2] = CE_STARTEST
XCTR_OUT[1] = CE_DVTEST
FSTARTOUT and DVALIDOUT and CO[7:0] = CE_XTEST[9:0] when
I_Q_SEL = 0 or CE_YTEST[9:0] when I_Q_SEL = 1
Figure 3.19 shows the CE output waveform.
Xn
Yn
Yn + 1
Xn + 2
Yn + 2
Xn + 1
CLK36
FFT_X/YOUT[9:0]
FFT_DVOUT_OFF
FFT_STAROUT_OFF
I_Q_SEL
l64781.book Page 16 Friday, January 19, 2001 1:28 PM
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