NT68665 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

NT68665

Flat Panel Monitor Controller

Unspecified 

NT68665/NT68625

and the position and duration are programmable. The simpler clamp-timing generator clamping pulse-

starting position and pulse width is defined in 0x021[7:0] and 0x022[7:0].

NT68665/NT68625 has three independent variable gain amplifiers for each channel with input signal

range from 0.55V to 0.9V（p-p）, the full-scale range is set in three 9-bit registers.

NT68665/NT68625’s offset control shifts the entire input range, resulting in a change in image

brightness. The three independent variable 8-bit registers provide independent settings for each

channel.

Clamp Pulse generator

This block circuit called Clamp pulse generator generates clamp pulse to ADC. There are two input

trigger sources of the clamp generator, one is signal Hin from separator and another is Row Hs from

the HSYNCI0 / HSYNCI1. The polarity and the trigger edge of the clamp can be selected by using bit

CLMP_POL and bit CLMP_EDG respectively. The trigger delay of the clamp is waiting CLMP_BEG

[5:0] x REFCLK time. The pulse width of the clamp output may be selected by CLMP_WID [5:0].

Clamp Pulse Timing

HSY NCI / HIN

Positive Polarity

HSY NCI / HIN

Negative Polarity

Leading Edge

Trailing Edge

clamp

CLMP_EDG=1

CLMP_POL=1

clamp

CLMP_EDG=0

CLMP_POL=1

tP W _C LM P

tD _C LM P

clamp

CLMP_EDG=1

CLMP_POL=0

clamp

CLMP_EDG=0

CLMP_POL=0

Clamp Pulse Timing

Figure 6.2-1 Clamp Pulse Timing

COAST

This function is used to cause the pixel clock generator to stop synchronizing with Hsync and

continues producing a clock at its current frequency and phase. This is useful when processing

composite sync that fails to produce horizontal sync pulses when in the vertical interval.

6.3. DVI Receiver

The DVI receiver uses Panel Link Digital technology to support input ranging from VGA to UXGA (25-

165 MHz), which is ideal for desktop and specialty applications.

2006-02-09

20

Ver. 0.40

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