TMC22091 datasheet(19/60 Pages) CADEKA

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PRODUCT SPECIFICATION

TMC22091/TMC22191

Control Register Deﬁnitions (continued)

Miscellaneous Control Register (0E)

EFEN

COMPD/A

SVIDD/A

FKREN

RATIO

TFLK

T512

CB100

Reg

Bit

Name

Function

EFEN

are disabled. When HIGH, Registers 0E and 0F are active. When Registers 0E

and 0F are enabled, Register 00 bit 3 is ignored. Register 0E bit 7 will read back

whatever value was written.

COMPD/A

COMPOSITE D/A disable. When HIGH, the COMPOSITE D/A converter is

powered-down. When LOW, the D/A is enabled.

SVIDD/A

LUMA/CHROMA D/A disable. When HIGH, the LUMA and CHROMA D/A

converters are powered-down. When LOW, they are enabled.

FKREN

Luminance processing enable. When FKREN is HIGH, the KEY input defines

the function of CVBS input data. When the KEY input is HIGH, CVBS data is

keyed over PD input data. When KEY is LOW, CVBS data is assumed to be

luminance data delayed by one When FKREN is LOW, the KEY input operates

normally, switching between CVBS and PD data.

RATIO

Luminance ratio control bit. When LOW, 1/2 of current luminance and 1/2 of

field delayed luminance from the CVBS input are added to yield a new

combined luminance value. When RATIO is HIGH, 3/4 of current luminance is

added to 1/4 of the delayed luminance to produce a new luminance value.

TFLK

Luminance-pass threshold. The difference between current luminance and

delayed luminance (from the CVBS inputs) is compared against a preset

threshold set by TFLK. When TFLK is LOW, the high threshold must be

exceeded to trigger the combining of current and delayed luminance (according

to RATIO). If the higher threshold is not exceeded, current luminance is passed

without modification. When TFLK is HIGH, a lower threshold is used to trigger

the combining of current and delayed luminance.

T512

EH/SL offset control bit. When LOW, the true value of EH and SL is offset by

256. When HIGH, the true value for EH and SL is offset by 512.

CB100

NTSC/PAL color bars select. When HIGH, color bars with 100% white level are

selected. When LOW, color bars will have 75% white level.

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