Datasheet

TVP5154A

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SLES214C–DECEMBER 2007–REVISED SEPTEMBER 2010

7.3.4 Interleave Field Control 2

Address 36Eh

Default 0h

7 6 5 4 3 2 1 0

Field mode(3) Field mode(2) Field mode(1) Field mode(0)

15 14 13 12 11 10 9 8

Field mode(7) Field mode(6) Field mode(5) Field mode(4)

7.3.5 Interleave Field Control 3

Address 36Fh

Default 0h

7 6 5 4 3 2 1 0

Field mode(11) Field mode(10) Field mode(9) Field mode(8)

15 14 13 12 11 10 9 8

Field mode(15) Field mode(14) Field mode(13) Field mode(12)

These registers allow the output data stream to toggle between unscaled and scaled data on a field basis.

By setting Field mode[n] appropriately, it is possible to use the available output bandwidth to interleave

unscaled and scaled frames to achieve reduced frame rates, while still maintaining compatibility with

legacy data receivers. These registers can also be used to reduce the frame rate of either unscaled data

or scaled data by disabling fields within the sequence.

A counter automatically moves from Field mode[0] to Field mode[n] where n can be 0 through 15, then

returns back to Field mode[0]. Depending on the value of Field mode[n], either unscaled data, scaled data,

or no data is sent for the current frame.

00 = Unscaled data

01 = Null frame (no SAV/EAV sequence will be generated)

10 = Scaled data

11 = Reserved

The values programmed for registers 3A8h and 3A9h are different for NTSC (also NTSC4.43 and PAL-M)

and for PAL (also PAL-Nc and SECAM).

7.3.6 Vertical Scaling Field 1 Control

Address 3A8h

Default 0h

7 6 5 4 3 2 1 0

V_Field1[7:0]

15 14 13 12 11 10 9 8

Reserved V_Field1[8]

Vertical scaling initial value in field 1 [8:0]: Initial value of vertical accumulator for field 1

For NTSC:

V_Field1 = (1.5 × V_Field2) – 128

If V_Field 1 is negative, add V_Field2 to V_Field1 and add V_Field2 to V_Field2 until V_Field1 is positive.

For PAL:

V_Field1 = (Vdesired/Vactive) × 256

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