SAA7146AH

The SAA7146AH is a high-performance multimedia bridge designed by NXP Semiconductors, integrating a scaler and PCI circuit (SPCI). This component facilitates full-size, full-speed video delivery to and from frame buffers or virtual system memory, enabling diverse processing capabilities for external PCI devices.

Key features include a full bandwidth PCI-bus master write and read capability, reaching up to 132 MB/s. It also provides virtual memory support, allocating 4 MB per DMA channel. The device can process a maximum of 4095 active samples per line and 4095 lines per frame. Additional video processing functions include vanity picture generation, video flip, color space conversion with gamma correction, chroma keying, and pixel dithering.

The SAA7146AH supports synchronized programming of internal registers via the Register Programming Sequencer (RPS), allowing control of two asynchronous data streams simultaneously. Its Memory Management Unit (MMU) supports virtual demand paging, compatible with operating systems like Windows and Unix. Clipping functions for rectangular areas and random shapes are also included to minimize PCI-bus load and protect specific frame buffer regions. The device is housed in a PQFP160 package.