LC7871E Datasheet | SANYO

Ordering number : EN4861 CMOS LSI LC7871E, 7871NE CD Graphics Decoder Overview The LC7871E and LC7871NE are CMOS LSIs that integrate the signal processing functions required for pact disk extended graphics (CD-EG) decoding in a single chip. These products accept the R to W subcode signals output by CDP-DSP products such as the LC7860KA, LC7867E, LC7868E, LC7869E, or LC78681E, and perform de-interleaving, error detection and correction, graphics instruction processing, and image processing. Functions - The LC7871E and LC7871NE allow a CD-EG decoder to be constructed with only three chips with the addition of two external DRAMs (64k × 4). (An RGB encoder is provided on chip.) - The LC7871E and LC7871NE perform subcode synchronization signal interpolation and protection. They also perform R to W signal de-interleaving and error detection and correction. - These products include two crystal oscillator systems (one for NTSC and one for PAL) which can be easily switched from a control pin. These products generate the reference clocks as well as all internal timings for these two standards by using a 14.31818 MHz crystal for NTSC and a 17.734476 MHz crystal for PAL. - Control of image display using CD graphics instructions and display processing. - posite video 8-bit D/A converter output as well as “define-transparency” 6-bit D/A converter output. - Support for superimposition - Microprocessor interface function that supports end- product upgrades. - External input pin for channel selection - Built-in 6-bit RGB D/A converters - The only difference between the LC7871E and the LC7871NE is in the BGC to VRAM transfer. The LC7871E uses a preset memory instruction for transfer to VRAM, whereas the LC7871NE uses the load CLUT instruction. Features - A CD-G decoder can be constructed from only two chips, since no controller is required. - A CD-EG decoder can be constructed with the addition of two 256-kbit DRAMs since no controller is required. - Silicon gate CMOS...