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SAA7215 Datasheet(PDF) 4 Page - NXP Semiconductors |
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SAA7215 Datasheet(HTML) 4 Page - NXP Semiconductors |
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4 / 28 page  2000 Jan 31 4 Philips Semiconductors Preliminary specification Integrated MPEG AVGD decoders SAA7215; SAA7216; SAA7221 Graphics features 2 nearly identical graphics planes: the first graphics plane commonly called the background plane and the second graphics plane commonly called foreground plane. The following features apply for both planes. • Graphics is presented in boxes independent of video format • Boxes can be up to full screen allowing double buffer display mechanism • Two independent data paths with RGB 4 :4:4 and YCbCr 4 : 2 : 2 formats available with independent mixing • RGB path transparent to YCbCr format • Conversion matrices available to allow any format on any different data path (RGB or YCbCr) • Screen arrangement of boxes is determined by display list mechanism which allows for multiple boxes, background loading, fast switching, scrolling, overlapping and fading of regions • Real-time anti-flickering performed in hardware; programmable hardware available for off-line anti-flickering • Hard edged or soft edged wiping of regions available • Support of 2, 4, 8, 16 bit/pixel in fixed bit maps format or coded in accordance to the DVB variable/run length standard for region based graphics • Chrominance down-sampling filter switched per region • Display colours are obtained via colour look up tables or directly from bitmap; CLUT output can be YCbCrT at 8-bit for each signal component thus enabling 16 M different colours and 6-bit for T which gives 64 mixing levels with video; CLUT output can also be RGBT with same resolutions; non linear processing available by means of LUTs • Map table mechanism to specify a sub set of entries if the CLUT is larger than required by the coded bit pattern; supported map tables are 16 to 256, 4 to 256 and4to16 • Up to 4 graphics boxes may overlap vertically even inside one graphics layer thanks to the use of flexible chained descriptors • Graphics mechanism can be used for signal generation in the vertical blanking interval; useful for teletext, wide screen signalling, closed caption etc. In addition to the previous listed features, the second graphics plane sustains: • Teletext insertion with automatic teletext data retrieving from the external SDRAM. Data manipulation unit • Powerful 3D block move with different patterns for source and destination area • Dedicated events for video synchronization • Scaling, format conversion and bit manipulation from a chained list of instructions. Cursor • Size of 1024 pixels • Programmable shape (8 × 128, 16 × 64, 32 × 32, 64 × 16 and 128 × 8) • 16 colours available with a 4 level transparency mixing with video and graphics • Cursor colours obtained via two 16 entry CLUTs with YCbCrT at 6, 4, 4 respectively 2 bits and RGBT at 4, 4, 4 respectively 4 bits (or 4, 5, 3, respectively 4 bits) • Cursor can be moved freely across the screen without overlapping restrictions. Digital output • Programmable selection for the mixed graphics planes with video for the CVBS and RGB outputs • Digital video input/output interface on 8 bit, 27 MHz (CbYCrY multiplexed bus), at a CCIR-656 format. Analog output • Analog video output interface on both the RGB and Y/C/CVBS formats available simultaneously • PAL/NTSC/SECAM encoding (SAA7221HS only) • Two DACs for CVBS, Y and C, CVBS running at 27 MHz 10-bit resolution • Three DACs for R (Y), G (Cb) and B (Cr) running at 27 MHz; 9-bit resolution connected to a 10-bit input DAC • Closed captioning and teletext encoding on CVBS • Macrovision 7.01 and 6.1 encoding capability on Y or CVBS and C or CVBS (SAA7216HS only). |
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