VP310

PRELIMINARY DATA

19

2.4 Channel change sequence with a new symbol rate

If the VP310 is running, to change channel and Symbol rate but not Viterbi coding rate, change

the tuner data and possibly the DiSEqC data and Symbol rate. NO reset is necessary.

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 - Symbol rate

eg 22.0 MBaud :

Reg 23 = 22 (16hex)

Reg 24 = 0

Viterbi code rate

eg V_IQ swap not set, CR = 5/6:

Reg 25 = 8 (8hex)

GO

Re-acquire signal

Reg 27 = 1

Figure 15. Channel change sequence with new Symbol rate, DVB mode.