SUMMARY DESCRIPTION

These are system memory devices for use with Digital Signal Processors from the popular Analog Devices ADSP-218X family. DSM means Digital signal processor System Memory. A DSM device brings in-system programmable Flash memory, programmable logic, and additional I/O to DSP systems. The result is a simple and flexible twochip solution for DSP designs.

FEATURES SUMMARY

■ Glueless Connection to DSP

– Easily add memory, logic, and I/O to DSP

■ 128K Byte Flash Memory

– For Bootloading and/or Data Overlay Memory

– Programmable Decoding and Paging Logic allows accessing Flash memory as Byte DMA (BDMA) and as External Data Overlay memory

– Rapidly access Flash memory with BDMA for booting and loading internal DSP Overlay memory. Alternatively access the same Flash memory as External Data Overlay memory to efficiently write Flash memory with code updates and data, a byte at a time with no DMA setup overhead

– Individual 16K Byte Flash memory sectors match size of DSP External Data Overlay window for efficient data management. Integrated page logic provides easy DSP access to all 128K Bytes.

– DSM connects to lower byte of 16-bit DSP data bus. Byte-wide accesses to 8-bit BDMA space. Half-word accesses to 16-bit Data Memory Overlay and 16-bit I/O Mem space.

■ 5V Devices (±10)

■ Up to 16 Multifunction I/O Pins

– Increase total DSP system I/O capability

– I/O controlled by DSP software or PLD logic

– 8mA I/O pin drive at 5 Vcc

■ General purpose PLD

– Over 3,000 Gates of PLD with 16 macro cells

– Use for peripheral glue logic to keypads, control panel, displays, LCD, UART devices, etc.

– Eliminate PLDs and external logic devices

– Create state machines, chip selects, simple shifters and counters, clock dividers, delays

– Simple PSDsoft ExpressTM software ...Free

■ In-System Programming (ISP) with JTAG

– Program entire chip in 10-20 seconds with no involvement of the DSP

– Eliminate sockets for pre-programmed memory and logic devices

– Efficient manufacturing allows easy product testing and Just-In-Time inventory

– Use low-cost FlashLINKTM cable with PC

■ Content Security

– Programmable Security Bit blocks access of device programmers and readers

■ Zero-Power Technology

– 75 μA standby at VCC=5V

■ Small Packaging

– 52-pin PQFP or 52-pin PLCC

– Packages are ECOPACK®

■ Memory Speed

– 90 ns