參數(shù)資料
型號： L64777
英文描述： L64777 DVB QAM Modulator technical manual 6/00
中文描述： L64777的DVB QAM調(diào)制器技術(shù)手冊6 / 00
文件頁數(shù)： 114/124頁
文件大?。?/td> 988K
代理商： L64777
B-4
PLL Divider Settings and L64724/34 Connection
When the input to the L64777 is from the L64724 for a satellite of
selected center frequency and baud rate, the parameters to be
programmed into the L64777 for 64 QAM are:
Operational Mode = NCO mode (Mode 2)
Block Length = 188 bytes
GAP = 16 bytes
I-Counter = 6 (0x6)
O-Counter = 32 (0x20)
After synchronization:
OCLK = Baud rate x 2 x 3/4 x oversampling x 1/(symbol size)
SCLK = OCLK/4
where:
oversampling = 4
symbol size = 6 for QAM mode of 64 (log of QAM level to
base 2)
Note that the PLL_SET bit (Register 1) must be set before downloading
any counter parameters, and it must be cleared after completion. This
applies to Mode 2 programming.
相關(guān)PDF資料
PDF描述
L64777 Digital Video Broadcasting(DVB)-Compliant,quadrature amplitude modulation (QAM)Modulator(數(shù)字視頻廣播系統(tǒng)適配的積分調(diào)幅調(diào)制器)
L64825 Non-VGA Video Controller
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