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