MC92314 Datasheet, PDF (66/100 Pages) Motorola, Inc – DVB-T Single Chip Demodulator Application Note

Freescale Semiconductor, Inc.
DVB-T Demodulator Interfaces
DDEC Default Decrement Select
0: Accumulator decrement in Node Synchroniser is defined by I2C Register DECREMENT
1: Accumulator decrement in Node Synchroniser is used rate dependent from Table 3-1..
DTHRES Default Threshold Select
0: Accumulator threshold in Node Synchroniser is defined by I2C Register THRESHOLD
1: Accumulator threshold in Node Synchroniser is 8 x 2⁹
IFS Input Format Select
0: The I-Q-Inputs G1DATA2..0 and G2DATA2..0 are interpreted as offset binary
1: The I-Q-Inputs G1DATA2..0 and G2DATA2..0 are interpreted as sign magnitude
n ^{VSYNC[2:0] Decoder Rate Select}
tio ^{000: Select fixed Viterbi decoder rate of 1/2}
a _{001: Select fixed Viterbi decoder rate of 2/3}
m 010: Select fixed Viterbi decoder rate of 3/4
r _{011: Select fixed Viterbi decoder rate of 5/6}
fo _{100: Select fixed Viterbi decoder rate of 7/8}
In _{111: Automatic Viterbi decoder rate selection}
ary _{4.2.2.2.2 THRESHOLD Register}
in _{Read -}
Write
lim ^Access
7
6
5
e ^W
0
0
0
Pr ^{Default Setting After Reset:}
4
THRES[4]
3
THRES[3]
2
THRES[2]
1
THRES[1]
0
THRES[0]
I2C
Register
Address
$01
0
0
0
0
0
0
0
0
THRES[4:0] Accumulator Threshold Value
When DTHRES is 0 THRES[4:0] will be used as threshold value in Node Synchroniser.
MOTOROLA
4-18
Single Chip DVB-T Demodulator - Rev. 1.3 (11/30/98)
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