GENERAL DESCRIPTION

The ADSP-218xN series consists of six single chip microcomputers optimized for digital signal processing applications. The high-level block diagram for the ADSP-218xN series members

appears on the previous page. All series members are pin-compatible and are differentiated solely by the amount of on-chip SRAM. This feature, combined with ADSP-21xx code compatibility, provides a great deal of flexibility in the design decision.

PERFORMANCE FEATURES

12.5 ns Instruction cycle time @1.8 V (internal), 80 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 featuring low CMOS standby power dissipation with 200 CLKIN cycle recovery from power-down condition

Low power dissipation in idle mode

INTEGRATION FEATURES

ADSP-2100 family code compatible (easy to use algebraic syntax), with instruction set extensions

Up to 256K byte of on-chip RAM, configured Up to 48K words program memory RAM Up to 56K words data memory RAM

Dual-purpose program memoryfor 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

100-lead LQFP and 144-ball BGA

SYSTEM INTERFACE FEATURES

Flexible I/O allows 1.8 V, 2.5 V or 3.3 V operation All inputs tolerate up to 3.6 V regardless of mode

16-bit internal DMA port for high-speed access to on-chip memory (mode selectable)

4M-byte memory interface for storage of data tables and program overlays (mode selectable)

8-bit DMA to byte memory for transparent program and data memory transfers (mode selectable)

Programmable memory strobe and separate I/O memory space permits “glueless” system design

Programmable wait state generation

Two double-buffered serial ports with companding hardware and automatic data buffering

Automatic booting of on-chip program memory from byte wide external memory, for example, EPROM, or through internal DMA Port

Six external interrupts

13 programmable flag pins provide flexible system signaling

UART emulation through software SPORT reconfiguration

ICE-Port™ emulator interface supports debugging in final systems