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ADV7150LS170 Datasheet(PDF) 29 Page - Analog Devices |
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ADV7150LS170 Datasheet(HTML) 29 Page - Analog Devices |
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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 0 0 PALETTE SELECT BITS MR16 MR17 0 1 PALETTE SELECT BITS MR16 MR17 1 0 PALETTE SELECT BITS MR16 MR17 1 1 256 x 30 PALETTE P0–P7 Multiple Devices Driving a Multiwindow Application |
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