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ADV7150LS170 View Datasheet(PDF) - Analog Devices

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ADV7150LS170 Datasheet PDF : 36 Pages
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ADV7150
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
R0–R7
G0–G7
B0–B7
PS0, PS1
ADV7150
256 x 30
RAM
ANALOG
O/P
PALETTE SELECT BITS
MR16 MR17
0
0
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
(DEVICE: 2)
DACs
(DEVICE: 1)
DACs
IOR, IOG, IOB
IOR,
IOG,
IOB
ZS = 75
(SOURCE
TERMINATION)
ZO = 75
(CABLE)
ZL = 75
(MONITOR)
Multiple Devices Termination for a Single Monitor
P0–P7
REV. A
ADV7151 (1)
256 x 30
PALETTE
RGB
ANALOG
VIDEO
PALETTE SELECT BITS
MR16 MR17
0
1
ADV7151 (2)
256 x 30
PALETTE
VIDEO TO MONITOR
RGB
ANALOG
VIDEO
PALETTE SELECT BITS
MR16
1
MR17
0
MONITOR
TRUE-COLOR BACKGROUND
WINDOW 1
(Pseudo-Color)
PS0=0: PS1=1
WINDOW 2
(Pseudo-Color)
PS0=1: PS1=0
WINDOW 3
(Pseudo-Color)
PS0=1: PS1=1
ADV7151 (3)
256 x 30
PALETTE
RGB
ANALOG
VIDEO
PALETTE SELECT BITS
MR16 MR17
1
1
Multiple Devices Driving a Multiwindow Application
–29–
 

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