Information as of 2000-01-10
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SAA7146A; Multimedia bridge, high performance Scaler and PCI circuit (SPCI)

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Description

The SAA7146A, Multimedia PCI-bridge, is a highly integrated circuit for DeskTop Video (DTV) applications. The device provides a number of interface ports that enable a wide variety of video and audio ICs to be connected to the PCI-bus thus supporting a number of video applications in a PC.

Features

Video processing

• Full size, full speed video delivery to and from the frame buffer or virtual system memory enables various processing possibilities for any external PCI device
• Full bandwidth PCI-bus master write and read (up to 132 Mbytes/s)
• Virtual memory support (4 Mbytes per DMA channel)
• Processing of maximum 4095 active samples per line and maximum 4095 lines per frame
• Vanity picture (mirror) for video phone and video conferencing applications
• Video flip (upside down picture)
• Colour space conversion with gamma correction for different kinds of displays
• Chroma Key generation and utilization
• Pixel dithering for low resolution video output formats
• Brightness, contrast and saturation control
• Video and Vertical Blanking Interval (VBI) synchronized programming of internal registers with Register Programming Sequencer (RPS), ability to control two asynchronous data streams simultaneously
• Memory Management Unit (MMU) supports virtual demand paging memory management (Windows, Unix, etc.)
• Rectangular clipping of frame buffer areas minimizes PCI-bus load
• Random shape mask clipping protects selectable areas of frame buffer
• 3 x 128 Dword video FIFO with overflow detection and ‘graceful’ recovery.

Audio processing

• Time Slot List (TSL) processing for flexible control of audio frames up to 256 bits on 2 asynchronous bidirectional digital audio interfaces simultaneously (4 DMA channels)
• Video synchronous audio capture, e.g. for sound cards
• Various synchronization modes to support I²S and other different audio and DSP data formats
• Audio input level monitoring enables peak control via software
• Programmable bit clock generation for master and slave applications.

Scaling

• Scaling of video pictures down to randomly sized windows (vertical down to 1 : 1024; horizontal down to 1 : 256)
• High Performance Scaler (HPS) offers two-dimensional, phase correct data processing for improved signal quality of scaled video data, especially for compression applications
• Horizontal and vertical FIR filters with up to 65 taps
• Horizontal upscaling (zoom) supports e.g. CCIR to square pixel conversion
• Additional Binary Ratio Scaler (BRS) supports CIF and QCIF formats, especially for video phone and video conferencing.

Interfacing

• Dual D1 (8-bit, CCIR 656) video I/O interface
• DMSD2 compatible (16-bit YUV) video input interface
• Supports various packed (pixel dithering) and planar video output formats
• Data Expansion Bus Interface (DEBI) for interfacing with e.g. MPEG or JPEG decoders with Intel (ISA like) and Motorola (68000 like) protocol style, capability for immediate and block mode (DMA) transfers with up to 23 Mbytes/s peak data rate
• 5 digital audio I/O ports
• 4 independent user configurable General Purpose I/O Ports (GPI/O) for interrupt and status processing
• PCI interface (release 2.1)
• I²C-bus interface (bus master).

General

• Subsystem (board) vendor ID support for board identification via software driver
• Internal arbitration control
• Diagnostic support and event analysis
• Programmable Vertical Blanking Interval (VBI) data region for e.g. to support INTERCAST, teletext, closed caption and similar applications
• 3.3 V supply enables reduced power consumption, 5 V tolerant I/Os for 5 V PCI signalling environment.

Datasheet

Type nr.	Title	Publication release date	Datasheet status	Page count	File size (kB)	Datasheet
SAA7146A	Multimedia bridge, high performance Scaler and PCI circuit (SPCI)	09-Apr-98	Product Specification	144	645	Open

Blockdiagram

Products, packages, availability and ordering

Partnumber	Order code (12nc)	marking/packing	package	device status	buy online
SAA7146AH/00	9352 422 10551	Standard marking * tray dry pack, bakeable, single	SOT322	CQS	-
	9352 422 10557	Standard marking * tray dry pack, bakeable, multiple	SOT322	CQS	-
SAA7146AH/02	9352 606 98551	Standard marking * tray dry pack, bakeable, single	SOT322	RFS	-
	9352 606 98557	Standard marking * tray dry pack, bakeable, multiple	SOT322	RFS	-
SAA7146AHZ/00	9352 422 20551	Standard marking * tray dry pack, bakeable, single	SOT316	CQS	-
SAA7146AHZ/02	9352 606 99551	Standard marking * tray dry pack, bakeable, single	SOT316	RFS	-
	9352 606 99557	Standard marking * tray dry pack, bakeable, multiple	SOT316	RFS	-

Please note, devices listed in the "Products, packages, availability and ordering" table marked with "WIT" are discontinued. Devices marked with "DOD" will be in the near future.
Contact your nearest sales or distributor office for the latest information on product status and availability.

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