HDM8513AP datasheet(46/67 Pages) HYNIX

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Reset Functions

Bit 0. Symbol Timing Frequency Accumulator

When this bit is set to zero, the frequency accumulator in the symbol

tracking loop is cleared to zero. This bit must be set to one in normal

tracking operation to implement a second order tracking loop, otherwise

the loop is first order.

Bit 1. Carrier Phase Tracking Frequency Accumulator

When this bit is set to zero, the frequency accumulator in the carrier

phase tracking loop is cleared to zero. This bit must be set to one in

tracking operation to implement a second order loop filter otherwise the

loop is first order.

Bit 2. Wideband AGC Accumulator

When this bit is set to zero, the accumulator in the wideband AGC is

cleared to zero. In normal operation, this bit is set to one. When the

wideband AGC is set to Mode 1, this bit has no effect as the integrator

must be implemented in the external analog circuits.

Bit 3. Narrowband AGC Accumulator

When this bit is set to zero, the accumulator in the narrowband AGC is

cleared to the initial value defined in location 0E. In normal operation,

this bit is set to one.

Bit 4. Unused

Bit 5. Carrier Sweep Function

When this bit is set to zero, the sweep function is disabled and the

carrier frequency is forced to the preset value defined in register

locations 04, 05 and 06.

Bit 6. Viterbi Reset

When this bit is set to zero, the accumulator for the signal quality is

cleared to zero. In normal operation, this bit is set to one.

Bit 7. Reed Solomon Error Counter

When this bit is set to zero, the counters for the number of corrected

errors and the number of uncorrected code words are cleared to zero.

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