MSM7654 datasheet(13/53 Pages) OKI

13 / 53 page

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MSM7654

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• Overlay Control Block

This block selects input image data or YUV Color Generator output signals.

It is determined by the level of the control signal (OLC, CR [3]), as shown below: (x : don't care)

CR [3] = 1, OLC = x: Selects color bar signal (YUV Color Generator output signal).

CR [3] = 0, OLC = 1: Selects overlay signal (YUV Color Generator output signal).

CR [3] = 0, OLC = 0: Selects input image data.

• YUV to RGB Converter Block

This block converts YUV signals separated by the prologue block into RGB signals.

• Black & Blank Pedestal Block

This block adds sync signals at the luminance side to luminance signals.

• Interpolator + LPF Block

This block executes data interpolation and the elimination of high frequency components by

LPF for input chrominance signals.

•I2C Control Logic Block

This is the serial interface block based on I2C standard of Phillips Corporation.

Internal registers (MR0 and MR1) and command registers (CR0 and CR1) can be set from the

master side.

When writing to the internal registers other than MR1 [7] (black level control) and CR0 [2:1]

(overlay level), written contents are immediately set to them. It is during the vertical blanking

period that written contents are set to MR1 [7] and CR0 [2:1].

• Sync Generator & Timing Controller Block

This block generates sync signals and control signals.

This block operates in slave mode, which performs external synchronization, and in master

mode, which internally generates sync signals.

• Color Burst Generator Block

Outputs U and V components of amplitude of burst signals.

• Subcarrier Generator Block

Executes color subcarrier generation.

• Low Pass Filter (LPF) Block

This block performs upsampling at CLKX2 for luminance signals and chrominance signals

modulated with CLKX1 divided from CLKX2. Interpolation processing is executed in this

process.

• DAC Block

This block converts digital video signals to analog video signals with a 10-bit accuracy and

outputs them. Since the analog output pins (YA, CVBSO, CA) are current outputs, these pins

should be connected to external resistors. See "Analog output reference circuit in APPLICATION

CIRCUIT EXAMPLE" for resistance values.

MSM7654 Datasheet(PDF) 13 Page - OKI electronic componets