ADV7150LS170 datasheet(29/36 Pages) AD

29 / 36 page

ADV7150

–29–

REV. A

APPENDIX 4

MULTIPLE PALETTE APPLICATIONS

Palette Priority Select Inputs

The palette priority selection inputs allow up to four separate

palette devices to be used in a single system to drive a single

monitor with subpixel resolution. The IOR, IOG and IOB ana-

log video output signals of each device are connected together,

as shown. Signal inputs (PS0, PS1) determine on a pixel by pixel

basis which palette device drives the monitor. This allows for

implementation of multiple windows applications with each

device acting as an independent palette. During initialization,

each device is assigned two match bits, MR16 (PS0) and MR17

(PS1) in Mode Register MR1. PS0 and PS1 inputs will select

one of the preprogrammed devices at any instant when PS0, PS1

matches MR16, MR17, respectively. PS0 and PS1 are multi-

plexed similar to the pixel data, thus allowing for subpixel resolu-

tion. The diagrams show an example of one ADV7150 operating in

conjunction with three ADV7151’s (Pseudo-Color RAM-DACs).

Each displayed window on the monitor is driven by one of the

four devices, as determined on a pixel basis by PS0, PS1. Each

device’s analog output signals are connected together as shown.

Note: Only one palette device is selected at any particular

instant. The analog output levels of the unselected devices will

be 0 mA.

Other applications for the palette priority function using a mini-

mum of two devices (one ADV7150 and one ADV7151) include:

Cursor Overlay on 24-Bit Graphics

Active Live Video Overlay (from Frame Grabber)

Text/Character Generation and Overlay

DACs

IOR,

IOG,

IOB

ZO = 75Ω

ZS = 75Ω

(SOURCE

TERMINATION)

ZL = 75Ω

(MONITOR)

(CABLE)

DACs

IOR, IOG, IOB

(DEVICE: 2)

(DEVICE: 1)

Multiple Devices Termination for a Single Monitor

ADV7150

ADV7151 (1)

256 x 30

RAM

256 x 30

PALETTE

PALETTE SELECT BITS

ANALOG

O/P

RGB

ANALOG

VIDEO

VIDEO TO MONITOR

PS0, PS1

256 x 30

PALETTE

RGB

ANALOG

VIDEO

RGB

ANALOG

VIDEO

ADV7151 (2)

ADV7151 (3)

R0–R7

G0–G7

B0–B7

WINDOW 1

(Pseudo-Color)

PS0=0: PS1=1

WINDOW 3

(Pseudo-Color)

PS0=1: PS1=1

MONITOR

WINDOW 2

(Pseudo-Color)

PS0=1: PS1=0

TRUE-COLOR BACKGROUND

MR16

MR17

PALETTE SELECT BITS

MR16

MR17

PALETTE SELECT BITS

MR16

MR17

PALETTE SELECT BITS

MR16

MR17

256 x 30

PALETTE

P0–P7

Multiple Devices Driving a Multiwindow Application

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