MT312 Zarlink Semiconductor, MT312 Datasheet - Page 27

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

Figure 15 - Channel change sequence with new symbol rate, DVB mode
Program tuner via GPP in 'pass through mode
send TUNER DATA via 2-wire bus (5 bytes).
'open port with Reg 20 = 64 (40hex)
eg V_IQ swap not set, CR = 5/6:
eg Horizontal with 22kHz on:
close port with Reg 20 = 0
Signal input - symbol rate
Zarlink Semiconductor Inc.
Reg 22 = 65 (41hex)
Reg 23 = 22 (16hex)
Reg 25 = 8 (8hex)
Re-acquire signal
DISEQC_MODE
Viterbi code rate
eg 22.0 MS/s:
MT312
Reg 24 = 0
Reg 27 = 1
27
GO
Design Manual