ADSP 2181 Architecture and Pin Diagram

Computational Units: Every processor in the ADSP-2100 family contains three independent, full function computational units: an arithmetic/logic unit (ALU), a multiplier/accumulator (MAC) and a barrel shifter.

Address Generators & Program Sequencer:Two dedicated data address generators and a powerful program sequencer ensure efficient use of the computational units.

Buses:The processors have five internal buses.

On-chip Peripherals :

Serial Ports:Most ADSP-21xx processors have two bi-directional, double-buffered serial ports (SPORTs) for serial communications.

Timer:The programmable interval timer provides periodic interrupt generation.

21XX CORE

Host Interface Port (ADSP-2111, ADSP-2171, ADSP-21msp5x):The host interface port (HIP) is a parallel I/O port that allows for an easy connection to a host processor.

DMA Ports (ADSP-2181):The ADSP-2181 contains two DMA ports, and Internal DMA Port and a Byte DMA Port.

Base Architecture

ALU Block Diagram

Standard Functions

The standard ALU functions are listed below.

ALU Input/Output Registers

The sources of ALU input and output registers are shown below.

MR0, MR1 and MR2 are multiplier/accumulator result registers; SR0 and SR1 are shifter result registers.

ALU Status

The ALU status bits in the ASTAT register are defined below.

MULTIPLIER/ACCUMULATOR (MAC)

MAC Operations

Standard Functions

The functions performed by the MAC are:

MAC Input/Output Registers

The sources of MAC input and output are:

BARREL SHIFTERThe shifter provides

a complete set of

shifting functions for

16-bit inputs,yielding

a 32-bit output.

Shifter Input/Output Registers

The sources of shifter input and output are:

ADSP 2181 FEATURES

Performance

25 ns Instruction Cycle Time from 20 MHz Crystal

@ 5.0 Volts

40 MIPS Sustained Performance

Single-Cycle Instruction Execution

Single-Cycle Context Switch

3-Bus Architecture Allows Dual Operand Fetches in Every Instruction Cycle

Multifunction Instructions

Power-Down Mode

Integration

ADSP-2100 Family Code Compatible, with Instruction Set Extensions

80K Bytes of On-Chip RAM, Configured as 16K Words On-Chip Program memory RAM, 16K Words On-Chip Data Memory RAM

Dual Purpose Program Memory for Both Instruction and Data Storage

Independent ALU, Multiplier/Accumulator, and Barrel Shifter Computational Units

Two Independent Data Address Generators

Powerful Program Sequencer Provides Zero Overhead Looping

Conditional Instruction Execution

Programmable 16-Bit Interval Timer with Prescaler

System Interface

16-Bit Internal DMA Port for High Speed Access to On-Chip Memory

4 MByte Memory Interface for Storage of Data Tables and Program Overlays

8-Bit DMA to Byte Memory for Transparent Program and Data Memory Transfers

I/O Memory Interface with 2048 Locations Supports

Parallel Peripherals

Programmable Wait State Generation

Two Double-Buffered Serial Ports

Automatic Booting of On-Chip Program Memory from Byte-Wide External Memory, e.g., EPROM, or Through Internal DMA Port

Six External Interrupts

13 Programmable Flag Pins Provide Flexible System Signaling

ICE-Port™* Emulator Interface Supports Debugging in Final Systems

ADSP-2181 BASIC SYSTEM

Figure on the next slide shows a typical basic system configuration with the ADSP-2181, two serial devices, a byte-wide EPROM and optional external program and data overlay memories.

Programmable wait state generation allows the processor to interface easily to slow peripheral devices. The

ADSP-2181 also provides four external interrupts and two serial ports or six external interrupts and one serial port.