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參數(shù)資料
| 型號： | MT312 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 消費(fèi)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)： | 25/90頁 |
| 文件大?。?/td> | 318K |
| 代理商： | MT312 |
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Tuner Control
MT312
25
4.4 Tuner Control Read/Write Registers
4.4.1 General Purpose Port Control. Register 20 (R/W)
B7:
Reserved.
Must be set low.
B6:
2W PAS:
High = 2-wire bus Pass-through.
Low = GPP pin I/O direction set by GPP DIR[2:0].
B5-3:
GPP DIR[2:0]
Any bit set high con
fi
gures the corresponding GPP[2:0] pin as output
Any bit set low con
fi
gures the corresponding GPP[2:0] pin as input
Mixed use of pins as inputs and outputs is allowed.
If B6 = 1, pass-through mode, then:
GPP DIR[1:0] are ignored,
B2: = Input or output set by GPP DIR[2] - relating to pin 46.
NAME
ADR
B7
B6
B5
B4
B3
B2
B1
B0
Def
hex
GPP CTRL
20
Reserved
2W
PAS
GPP DIR[2:0]
GPP PIN[2:0]
R/W
20
Figure 18 - Channel change sequence with
search mode, DVB mode
Program tuner via GPP in 'pass through mode'
open port with Reg 20 = 64 (40hex)
send TUNER DATA via I2C bus (5 bytes).
close port with Reg 20 = 0
DiSEqC mode
eg Horizontal with 22kHz on:
Reg 22 = 65 (41hex)
Signal input - Search mode
eg for SYS_CLK=60MHz and
30 to 20 Mbaud range:
Reg 23 = 136 (88hex)
Reg 24 = 0
Viterbi code rate search
eg set: AUTO IQ detection
Reg 25 = 175 (AFhex)
GO
Re-aquire signal
Reg 27 = 1
Program MONITOR to read Symbol rate
MON_CTRL Reg 103 = 3
Read Symbol rate from MONITOR registers 123 & 124.
Symbol rate = MONITOR_H/4 + MONITOR_L/1024 MBaud
eg if MONITOR_H = 27 and MONITOR_L = 136
then Symbol rate = 27.53125 MBaud
ie 27.5 MBaud
±
0.25%
Read code rate from FEC_STATUS[B6-4] register 6.
eg if FEC_STATUS = 2C hex
signal is locked and the code rate = 3/4
Figure 19 - Results of Symbol rate and code
rate search, DVB or DSS mode
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