Z89462 データシートの表示（PDF） - Zilog

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Z89462

16-BIT, FIXED-POINT DIGITAL SIGNAL PROCESSOR

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PRELIMINARY

Z89462

CP95DSP0400

PRELIMINARY

CUSTOMER PROCUREMENT SPECIFICATION

FEATURES

Prog. RAM Prog./Data Data RAM Speed

Part (K Words) (K Words) (Words) (MHz)

Z89462 1

64

512

20, 40

s 100-Pin QFP and 124-Pin PGA Packages

s 0°C to +70°C Temperature Range

s 3.3- to 5.0-Volt Operating Range

40 MHz Operation @ 5.0V

20 MHz Operation @ 3.3V

s Six RAM Pointers for 4K-Word RAM Banks

s Three Maskable Vectored Interrupts, Edge or Level

Trigger Selectable

Z89462

16-BIT, FIXED-POINT

DIGITAL SIGNAL PROCESSOR

s Enhanced Instruction Set

s Single-Cycle Instruction Execution

s Four-Stage Pipeline

On-Board Peripherals

s Dual 8/16-Bit CODEC Interface

s Wait-State Generator

s Two 16-Bit Timer/Counters

s Dynamic Program Bus Sizing

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 available.

Expansion of the on-chip data RAM is provided through

future upgrades.

External interfaces include Address Bus and Data Bus for

external Program Memory, Address Bus and Data Bus for

external Data Memory, three vectored interrupt ports, and

two input/two output user ports.

Notes:

All Signals with a preceding front slash, "/", are active Low, e.g.,

B//W (WORD is active Low); /B/W (BYTE is active Low, only).

Power connections follow conventional descriptions below:

Connection

Circuit

Device

Power

V

V

CC

DD

Ground

GND

VSS

CP95DSP0400 (8/95)

1

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