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參數(shù)資料
| 型號： | MT312 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 消費家電 |
| 英文描述： | Satellite Channel Decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封裝： | MQFP-80 |
| 文件頁數(shù)： | 43/90頁 |
| 文件大?。?/td> | 318K |
| 代理商： | MT312 |
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QPSK Demodulator
MT312
43
B3:
Reserved High = QPSK FR UNLOCK
B2:
High = QPSK calculation complete
B1:
High = QPSK TS MAX
B0:
High = QPSK CS MAX
Reading an Interrupt register resets that register.
The majority of these interrupts are for diagnostic purposes and generally not useful in normal operation,
unless otherwise indicated.
B7:
High = QPSK state change
B6:
High = QPSK frequency end of search rangeimportant indicator.
B5:
High = QPSK BAUD end of rangeimportant indicator.
B4:
High = QPSK AFC success
B3:
High = QPSK AFC fail
B2:
High = QPSK next frequency search
B1:
High = QPSK same frequency search
B0:
High = QPSK LTV limit
Reading an Interrupt register resets that register.
Frequency and symbol rate search is carried out as follows. If the symbol rate is known then MT312 will search
the speci
fi
ed frequency range for this symbol rate. Once the end of this range has been reached, "QPSK end of
frequency range search" interrupt will be issued and MT312 will resume the search beginning from frequency
zero. A "QPSK end of Symbol rate range(s) search" interrupt will not be issued.
If the symbol rate is not known, then MT312 can be made to search several sub-ranges of symbol rates, by
setting 12 bits of the pair of SYM RATE registers, as described in section 4.4. For illustration purposes, assume
that the symbol rate sub-ranges SYS CLK/2 to SYS CLK/3 and SYS CLK/4 to SYS CLK/6 are to be searched.
Then MT312 will begin the search from the upper sub-range SYS CLK/2 to SYS CLK/3. MT312 will search for
a channel with a symbol rate in this range over the speci
fi
ed frequency range, for example ± 10 MHz. If no
channel is found then MT312 will issue a "QPSK end of frequency range search" interrupt and will go on to
search the sub-range SYS CLK/4 to SYS CLK/6 over the speci
fi
ed frequency range. If no channel is found,
then MT312 will issue a "QPSK end of frequency range search" interrupt as well as a "QPSK end of Symbol
rate range(s) search" interrupt. Then MT312 will return to search the speci
fi
ed frequency range for a symbol
rate in the range SYS CLK/2 to SYS CLK/3. This process continues inde
fi
nitely, unless it is interrupted by host
processor software.
NAME
ADR
B7
B6
B5
B4
B3
B2
B1
B0
Def
hex
QPSK INT L
02
QPSK INT [7:0] Interrupt QPSK (low byte)
R
00
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| MT3371BSR1 | Wide Dynamic Range DTMF Receiver |
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| MT3-1212WI | 制造商:VOLGEN 制造商全稱:VOLGEN 功能描述:3 WATT DC/DC CONVERTER, SIINGLE & MULTIIPLE OUTPUTS |
| MT3-1215WI | 制造商:VOLGEN 制造商全稱:VOLGEN 功能描述:3 WATT DC/DC CONVERTER, SIINGLE & MULTIIPLE OUTPUTS |
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