Z89462

P R E L I M I N A R Y Z89462 CP95DSP0400 PRELIMINARY CUSTOMER PROCUREMENT SPECIFICATION Z89462 16-BIT, FIXED-POINT DIGITAL SIGNAL PROCESSOR FEATURES Part Z89462 s s s Prog. RAM (K Words) 1 Prog./Data Data RAM (K Words) (Words) 64 512 Speed (MHz) 20, 40 s s s Enhanced Instruction Set Single-Cycle Instruction Execution Four-Stage Pipeline 100-Pin QFP and 124-Pin PGA Packages 0°C to +70°C Temperature Range 3.3- to 5.0-Volt Operating Range 40 MHz Operation @ 5.0V 20 MHz Operation @ 3.3V Six RAM Pointers for 4K-Word RAM Banks Three Maskable Vectored Interrupts, Edge or Level Trigger Selectable On-Board Peripherals s s s s Dual 8/16-Bit CODEC Interface Wait-State Generator Two 16-Bit Timer/Counters Dynamic Program Bus Sizing s s GENERAL DESCRIPTION The Z89462 is a high-performance Digital Signal Processor (DSP) optimized for processing and transferring data. This enhanced processor provides an upward migration path for its Z89C00/Z89321 predecessors. The DSP provides three 12-bit Register Pointers for each RAM bank. These pointers may be incremented or decremented automatically to implement circular buffers without software overhead. Three prioritized and individually maskable interrupts are provided for use by external peripherals requiring service from the DSP. The interrupt inputs can be individually conditioned for edge or level trigger. Acknowledgement of an activated interrupt occurs at the end of an instruction execution. Two banks of 512 x 16-bit data RAM are a...