STV0299B datasheet(26/36 Pages) STMICROELECTRONICS

26 / 36 page

STV0299B

5REGISTER LIST (continued)

26/36

VITERBI AND SYNCHRO SEARCH REGISTER (refer to

Section 4.6.2 on page 15)

VSEARCH

0: Automatic search mode

1: Manual search mode

6Freeze

[5:4]

SN[1:0]

This is the averaging period. The field gives the number of bits

required to calculate the rate error.

00 = 1024

01 = 4096

10 = 16384

11 = 65536

Reset Value: SN = 01 (4096 bits)

[3:2]

TO[1:0]

This is the time out value (given in 1024-bit periods). This field is used

to program the maximum duration of the synchro word research in

automatic mode. If no sync is found within this duration, and if bit RS6

(Sync Enable) is set in the Reed-Solomon register, another phase or

puncture rate is tried. If RS6 = 0, the time-out has no effect.

00 = 16

01 = 32

10 = 64

11 = 128

Reset Value: TO = 10 (64k bit periods)

[1:0]

H[1:0]

This is the hysteresis value. This field is used to program the maxi-

mum value of the Sync counter. The unit is the block duration

(204 bytes in DVB, 147 in DSS).

00: 16

01: 32

10: 64

11: 128

Reset Value: H = 01 (32 blocks)

Name

HEX

Address

Reset

Value

Bit

Position

Signal Description

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