HDM8513 datasheet(49/67 Pages) HYNIX

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Bit 4. This bit should be fixed to zero

Bit 5. Regulated Data Clock

Enables/Disables the data and data clock regulator. When this bit is set

to 1, data output and data clock are regulated by FIFO operation. When

this bit is set to 0, internal data output and internal data clock are by-

passed

Bit 6. Serial Valid

When this bit is set to 1, DATA_STB signal sustains high when valid bit

is out (mode 2). When this bit is set to 0, DATA_STB signal alternates

when every valid bit is out (mode 1). Refer to figure 12 and figure 13.

Bit 7. Clock Polarity

This bit is used to select the DATA_CLK polarity either for serial or

parallel transport interface. If this bit is set to zero(default value), the

transport data and control signals are latched at the positive edge of

DATA_CLK. Otherwise, the signals are latched at the negative edge of

DATA_CLK.

Viterbi Lock Threshold

Viterbi decoder. Ordinary users are recommended to use the default

value.

Bit[7:4] defines the lock threshold for VB_NODESYNC. Viterbi decoder

decides that the correct code rate has been found. A large number

means it takes longer to find the correct code rate in automatic

detection mode. It should be greater than 7. The default value is 12.

Bit[3:0] defines the lock fail threshold. Viterbi decoder rejects a code

rate and moves on to the next code rate. A small number means Viterbi

decoder tries more data before it moves to the next code rate. It should

be less than 7. The default value is 2.

Viterbi Unlock Threshold

This number defines the threshold to maintain the Viterbi lock state. A

large number means it needs more bad data to get out of the viterbi lock

state and re-start searching the correct code rate. The default value is

HDM8513 Arkusz danych(PDF) 49 Page - Hynix Semiconductor