MT312 Zarlink Semiconductor, MT312 Datasheet - Page 28

• Manufacturer Part Number: MT312
• Description: Satellite Channel Decoder
• Manufacturer: Zarlink Semiconductor

MT312
Design Manual
Program tuner via GPP in 'pass through mode'
open port with Reg 20 = 64 (40hex)
send TUNER DATA via 2-wire bus.
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 MS/s range:
Reg 23 = 136 (88hex)
Reg 24 = 0
Viterbi code rate search
eg set: AUTO IQ detection
Reg 25 = 175 (AFhex)
GO
Re-acquire signal
Reg 27 = 1
Figure 16 - Channel change sequence with search mode, DVB mode
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Zarlink Semiconductor Inc.