GENERAL DESCRIPTION

The ADSP-21020 is the first member of Analog Devices’ family of single-chip IEEE floating-point processors optimized for digital signal processing applications. Its architecture is similar to that of Analog Devices’ ADSP-2100 family of fixed-point DSP processors.

FEATURES

Superscalar IEEE Floating-Point Processor

Off-Chip Harvard Architecture Maximizes Signal

Processing Performance

30 ns, 33.3 MIPS Instruction Rate, Single-Cycle

Execution

100 MFLOPS Peak, 66 MFLOPS Sustained Performance

1024-Point Complex FFT Benchmark: 0.58 ms

Divide (y/x): 180 ns

Inverse Square Root (1/√x): 270 ns

32-Bit Single-Precision and 40-Bit Extended-Precision

IEEE Floating-Point Data Formats

32-Bit Fixed-Point Formats, Integer and Fractional,

with 80-Bit Accumulators

IEEE Exception Handling with Interrupt on Exception

Three Independent Computation Units: Multiplier,

ALU, and Barrel Shifter

Dual Data Address Generators with Indirect,

Immediate, Modulo, and Bit Reverse Addressing Modes

Two Off-Chip Memory Transfers in Parallel with

Instruction Fetch and Single-Cycle Multiply & ALU

Operations

Multiply with Add & Subtract for FFT Butterfly

Computation

Efficient Program Sequencing with Zero-Overhead

Looping: Single-Cycle Loop Setup

Single-Cycle Register File Context Switch

15 (or 25) ns External RAM Access Time for

Zero-Wait-State, 30 (or 40) ns Instruction Execution

IEEE JTAG Standard 1149.1 Test Access Port and

On-Chip Emulation Circuitry

223-Pin PGA Package (Ceramic)