Philips SAA7785

ThunderBird AvengerTM PCI Audio SAA7785

Accelerator

Philips Semiconductors Preliminary Specification

1999 Nov 12 26

DSP EXTERNAL MEMORY INTERFACE

MA[14:0] External Memory Address

Address lines for the external SRAM devices. The external memory interface can be used for

DSP code space if the EXT_SRAM_EN (in HDCFG, bit 5) is set. Otherwise, the DSP will use

internal ROM as the code source.

MD[15:0] External Memory Data Bus

Word wide data bus for the external SRAM. Use 6ns memory for maximum DSP performance.

MCS# External Memory Chip Select

Chip select line for the external SRAM devices.

MWE# External Memory Read/Write Control

Selects the external SRAM for reading or writing.

Contents

Main GENERAL DESCRIPTION FEATURES APPLICATIONS ORDERING INFORMATION QUICK REFERENCE DATA 1999 Nov 12 4 FIGURE 1 BLOCK DIAGRAM Serial CFG Port ThunderBird AvengerTM PCI Audio SAA7785 1999 Nov 12 5 PINNING TABLE 1 Signal and Pin Names for 128 pin SAA7785 ThunderBird AvengerTM PIN # 1999 Nov 12 6 SAA7785 Notes: 1. Package body size is 14 mm. 2. Scale is approx 1 = 5.08 mm (5X actual size). 128 PIN TQFP ThunderBird AvengerTM PCI Audio SAA7785 1999 Nov 12 7 PINNING TABLE 2 PIN DEFINITIONS FOR THE 100 Pin SAA7785 ThunderBird AvengerTM PIN # ThunderBird AvengerTM PCI Audio SAA7785 SAA7785 100 PIN TQFP FUNCTIONAL OVERVIEW Page Architectural Overview PCI Interface, Configuration, and Interrupt Serializer Clocks and the PLL Subsystem Multimedia Timer DMA AC Link Sound Blaster Registers OPL3 Registers and the FM Accelerators Virtual Registers Sample Fetch Accelerator MIDI Registers and UART General Purpose Input/Output PINE DSP Core SERIAL PORT INTERFACES Page VIRTUAL WRITE MASTER Game Port SAA7785 SIGNAL DEFINITIONS Page Page Page Page Page Page Page Page Page Page Page Page Page 1999 Nov 12 33 TABLE 10 Vendor ID Register - VENDOR_ID (RO) PCI CFG 0 D15 D14 D13 D12 D11 D10 D9 D8 Offset 00h VENDOR_ID[15:8] POR Value00010000 Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page MULTIMEDIA TIMER Page Page Page SAA7785 ThunderBird Avenger PCI Audio Accelerator Definitions Disclaimers