AL701 Ver la hoja de datos (PDF) - AverLogic Technologies Inc

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AL701

QUAD Video Processor

AverLogic Technologies Inc 

AL700/701/710

7.8.4 External OSD Mode

AL700/701/710 also supports external OSD mode. Most of the OSD devices use

OSD_VBLK to define the OSD active region. AL700/701/710 uses MONOSD_EN and

VCROSD_EN to decide whether the OSD Icons are shown on monitor and/or VCR

display output. The OSD_COLOR selects the color from color 0 or color 1 defined in

color LUT.

The following diagram shows how the OSD_VBLK signal defines the OSD active region:

The example bellow describes the function of each OSD control signal.

7.9 Memory Interface

AL700/701/710 supports various SDRAM configurations, such as 1Mx16 and 4Mx16 bit

SDRAM, which can be selected by register #81h. AL700/701/710 uses sequential Burst

mode to control SDRAM memory that operates at minimum 108MHz (9ns cycle time) of

clock frequency. Also you can use DRAMCTL0 and DRAMCTL1 registers (#80h and #81h)

to adjust the read/write performance of SDRAM. For detail operation of SDRAM, please

reference memory maker specifications.

©2001,2002-Copyright by AverLogic Technologies, Corp. Preliminary Version C1.1 27

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