4-Mbit Flash System Memory for DSPs

10 March 2004 DSP, Micros & Memory Surveillance

STMicroelectronics' 4-Mbit Flash DSM2150F5 is the company's third DSP system memory (DSM) product. It provides an in-system-programmable, turnkey system-memory solution for digital signal processors. In particular, the family is designed specifically to support Analog Devices' ADSP-2153x family of DSPs, but also supports their other general-purpose 16-bit and 32-bit DSP families.

The DSM2150F5 provides two independent Flash memory arrays of 512 Kbytes and 32 Kbytes (120 ns access time), an integrated programmable logic device array with over 3000 gates and 16 macrocells, and up to 40 multifunction I/O pins. By integrating Flash memory, programmable logic, and I/O ports, the DSM2150F5 connects directly and without additional logic to the DSP to form a simple, flexible two-chip subsystem on which to build DSP-based products for a wide range of applications.

The DSM2150F5 provides in-system programmability (ISP) via its JTAG ISP port. In this way, the company says that the device helps cut development time and eliminates the need for socket-mounted pre-programmed memory and logic devices. Other benefits are efficient just-in-time manufacturing, and simplified product manufacturing, testing, and field updates. The entire device (memory and configuration) can be programmed in 15-35 seconds via JTAG, with no involvement of the DSP. In addition, the DSM2150F5's JTAG port can be connected to the JTAG debug port of the DSP for fast code iterations on the bench. Designers can configure the DSM2150F5 in situ using PSDsoft Express, a point-and-click development tool available free of charge at www.st.com/psd.

While the large 512 Kbyte main Flash memory is ample storage for code and data tables to be boot loaded into DSP SRAM, the smaller sector size of the secondary 32 Kbyte Flash memory is ideal for storing small data sets and calibration constants, thus eliminating the need for an external EEPROM. The DSM2150F5 has 40 multifunction configurable I/O pins.

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