FPD87346 datasheet(2/3 Pages) NSC

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Block Diagram

Functional Description

FPD-LINK RECEIVER

The LVDS based FPD-Link Receiver inputs video data and

control timing through 4-LVDS channels plus clock to provide

24-bit color or 3-LVDS channels can be used for 18-bit color.

The video data is converted to a parallel data stream and

routed to the 8-6 bit translator.

SPREAD SPECTRUM SUPPORT

The FPD-Link receiver supports graphics controllers with

Spread Spectrum interfaces for reducing EMI. The Spread

Spectrum methods supported are Center and Down Spread.

A maximum of 2% total is supported at a frequency modu-

lation of 100kHz maximum.

8-6 BIT TRANSLATOR

8-bit data is reduced to a 6-bit data path via a time multi-

plexed dithering technique or simple truncation of the LSBs.

This function is enabled via the input control pins.

DATAPATH BLOCK AND RSDS TRANSMITTER

6(8)-bit video data (RGB) is input to the Datapath Block

supports up to an 85 MHz pixel rate. The data is delayed to

align the Column Driver Start Pulse (STH) with the Column

Driver data. The data bus (RSR[2:0]P/N, RSG[2:0]P/N,

RSB[2:0]P/N) outputs at a 170 MHz rate on 9 differential

output channels. The clock is output on the RSCKP/N differ-

ential pair. The RSDS Column Drivers latch data on both

positive and negative edges of the clock. The RSDS output

setup/hold

timings

are

also

adjustable

through

the

RSDS[2:0] input pins.

TIMING CONTROL FUNCTION

The Timing Control function generates control to Column

Drivers, Row Drivers, and power supply. The GPOs (General

Purpose Outputs) provide for CD latch pulse, REV, and Row

Driver control generation. The General Purpose Outputs

allow the user to generate control anywhere within the frame

data. Standard Row Driver interface or Custom Row Driver

interfaces can be implemented with the GPOs (General

Purpose Outputs).

RSDS OUTPUT VOLTAGE CONTROL

The RSDS output voltage swing is controlled through an

external load resistor connected to the R

PI pin. The RSDS

output signal levels can be adjusted to suit the particular

application. This is dependent on overall LCD module design

characteristics such as trace impedance, termination, etc.

The RSDS output voltage is inversely related to the R

value. Lower R

PI values will increase the RSDS output volt-

age swing and consequently overall power consumption will

also increase.

20061519

FIGURE 2. Block Diagram

FPD87346 Datasheet(PDF) 2 Page - National Semiconductor (TI)

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