SUMMARY DESCRIPTION
The DSM2190F4 is a system memory device for use with the Analog Devices ADSP-2191 DSP.
DSM means Digital signal processor System Memory. A DSM device brings In-System Programmable (ISP) Flash memory, parameter storage, programmable logic, and additional I/O to DSP systems. The result is a simple and flexible two-chip solution for DSP designs. DSM devices provide the flexibility of Flash memory and smart JTAG programming techniques for both manufacturing and the field. On-chip integrated memory decode logic makes it easy to map dual banks of Flash memory to the ADSP-2191 in a variety of ways for bootloading, code execution, data recording, code swapping, and parameter storage.

FEATURES SUMMARY
■ Glueless Connection to DSP
   – Easily add memory, logic, and I/O to the External Port of ADSP-2191 DSP
■ Dual Flash Memories
   – Two independent Flash memory arrays for storing DSP code and data.
      DSP may access the two arrays concurrently (read from one while
      erasing or writing the other)
   – 256K x 8 Main Flash memory divided into 8 sectors (32KByte each)
   – Ample storage for booting DSP code/data
      upon reset and subsequent code swaps
   – Large capacity for data recording
   – 32K x 8 Secondary Flash memory divided into 4
      sectors (8 KByte each). Multiple uses:
   – Small sector size ideal for small data sets,
      and calibration or configuration constants
   – Store custom start-up code in one or more
      sectors and configure DSP to run from external memory upon reset (no boot)
   – Concatenate Secondary Flash with Main
      Flash for total of 288 KBytes
   – Each Flash sector can be write protected.
   – Built-in programmable address decoding logic
      allows mapping individual Flash sectors to any
      address boundary
■ Up to 16 Multifunction I/O Pins
   – Increase total DSP system I/O capability
   – I/O controlled by DSP software or PLD logic
■ General purpose PLD
   – Over 3,000 Gates of PLD with 16 macro cells
   – Use for peripheral glue logic to keypads, control
      panel, displays, LCDs, and other devices
   – Eliminate PLDs and external logic devices
   – Create state machines, chip selects, simple
      shifters and counters, clock dividers, delays
   – Simple PSDsoft ExpressTM software...Free
■ Operating Range
– VCC: 3.3V±10%; Temperature: –40oC to +85oC
■ In-System Programming (ISP) with JTAG
   – Program entire chip in 10-25 seconds with no in
      volvement of the DSP
   – Links with ADSP-2191 JTAG debug port
   – Eliminate sockets for pre-programmed memory
      and logic devices
   – ISP allows efficient manufacturing and product
      testing supporting Just-In-Time inventory
   – Use low-cost FlashLINKTM cable with PC
■ Content Security
   – Programmable Security Bit blocks access of de
      vice programmers and readers
■ Zero-Power Technology
   – As low as 25µA standby current
■ Packaging
   – 52-pin PQFP or 52-pin PLCC
■ Flash Memory Speed, Endurance, Retention
   – 150 ns, 100K cycles, 15 year retention