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ADV7152LS85 Arkusz danych(PDF) 10 Page - Analog Devices |
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ADV7152LS85 Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 32 page ADV7152 –10– REV. B (Continued from page 1) applications. The part is controlled and programmed through the microprocessor (MPU) port. The part also contains a num- ber of onboard test registers, associated with self diagnostic test- ing of the device. The individual Red, Green and Blue pixel input ports allow True-Color, image rendition. True-Color image rendition, at speeds of up to 220 MHz, is achieved through the use of the onboard data multiplexer/serializer. The pixel input ports flex- ibility allows for direct interface to most standard frame buffer memory configurations. The 30 bits of resolution, associated with the color look-up table and triple 10-bit DAC, realizes 24-bit True-Color resolu- tion, while also allowing for the onboard implementation of lin- earization algorithms, such as Gamma-Correction. This allows effective 30-bit True-Color operation. The on-chip video clock controller circuit generates all the in- ternal clocking and some additional external clocking signals. An external ECL oscillator source with differential outputs is all that is required to drive the CLOCK and CLOCK inputs of the ADV7152. The part can also be driven by an external clock generator chip circuit, such as the AD730. The ADV7152 is capable of generating RGB video output sig- nals which are compatible with RS-343A and RS-170 video standards, without requiring external buffering. Test diagnostic circuitry has been included to complement the users system level debugging. The ADV7152 is fabricated in a +5 V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation. The ADV7152 is packaged in a plastic 100-pin power quad flat- pack (QFP). Superior thermal dissipation is achieved by inclu- sion of a copper heatslug, within the standard package outline to which the die is attached. Pixel Port and Clock Control Circuit The Pixel Port of the ADV7152 is directly interfaced to the video/graphics pipeline of a computer graphics subsystem. It is connected directly or through a gate array to the video RAM of the systems Frame-Buffer (video memory). The pixel port on the device consists of: Color Data RED, GREEN, BLUE Pixel Controls SYNC , BLANK Palette Selects PS0–PS1 The associated clocking signals for the pixel port include: Clock Inputs CLOCK, CLOCK, LOADIN, SCKIN Clock Outputs LOADOUT, PRGCKOUT, SCKOUT These onboard clock control signals are included to simplify interfacing between the part and the frame buffer. Only two control input signals are necessary to get the part operational, CLOCK and CLOCK (ECL Levels). No additional signals or external glue logic are required to get the Pixel Port & Clock Control Circuit of the part operational. Pixel Port (Color Data) The ADV7152 has 48 color data inputs. The part has two (for 2:1 multiplexing) 24-bit wide direct color data inputs. These are user programmed to support a number of color data for- mats including 24-Bit True Color, 15-Bit True Color and 8-Bit Pseudo Color (see “Color Data Formats” section) in 2:1 and 1:1 multiplex modes. A B MULTIPLEXER 24 24 24 RED GREEN BLUE 8 8 8 Figure 10. Multiplexed Color Inputs for the ADV7152 CIRCUIT DETAILS AND OPERATION OVERVIEW Digital video or pixel data is latched into the ADV7152 over the devices Pixel Port. This data acts as a pointer to the onboard Color Palette RAM. The data at the RAM address pointed to is latched into the digital-to-analog converters (DACs) and output as an RGB analog video signal. For the purposes of clarity of description, the ADV7152 is bro- ken down into three separate functional blocks. These are: 1. Pixel port and clock control circuit 2. MPU port, registers and color palette 3. Digital-to-analog converters and video outputs Table I shows the architectural and packaging differences be- tween other devices in the ADV715x series of workstation parts. (For more details consult the relevant data sheets.) Table I. Architectural and Packaging Differences of the ADV715x Series Description ADV7150* ADV7152 ADV7151* 24-Bit “Gamma” True Color • • 24-Bit “Standard” True Color • • 8-Bit “Gamma” Pseudo Color • • • 8-Bit “Standard” Pseudo Color • • • 15-Bit True Color • • 220 MHz – True Color • • 220 MHz – Pseudo Color • • • Triple 10-Bit DACs • • • 4:1 Multiplexing • • 2:1 Multiplexing • • • 1:1 Multiplexing • • • 160-Lead QFP • 100-Lead QFP • • *See ADV7151 and ADV7150 data sheets for more information on these parts. |
Podobny numer części - ADV7152LS85 |
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