DSP, Micros & Memory


New family of highly integrated memory devices

19 September 2007 DSP, Micros & Memory

Addressing the cost and time-to-market needs of system designers developing mobile and consumer electronics, Silicon Storage Technology (SST) has announced the first in its All-in-OneMemory product family, the SST88VP1107.

By blending the key benefits of NOR, NAND and RAM in a unified architecture, this product comes configured with 512 KB instant-on boot NOR, 128 MB execute-in-place (XIP) code storage, 120 MB data storage and 12 MB system RAM, making it ideal for mobile and embedded applications.

With code storage (NOR), data storage (NAND) and system RAM (PSRAM) functions all on a single PSRAM bus, the SST88VP1107 is well suited for applications that need high-density memory with enhanced performance, superior quality and high reliability.

By leveraging SST's Pseudo-NOR (PNOR) technology, All-in-OneMemory optimises the use of NAND flash for both code and data storage, eliminating the need for costly high-density NOR. The PNOR area provides 128 MB XIP code storage and emulates high-density NOR by using NAND as non-volatile storage and PSRAM as cache. In the SST88VP1107, 4 MB of PSRAM is configured as cache for the PNOR area. Caching NAND Flash content helps extend endurance and improve reliability of NAND Flash by minimising direct read/write access. The inherent demand paging scheme of the cache also eliminates the need for shadowing XIP code, thus reducing the size of required built-in system RAM.

The product offers a memory-mapped ATA (mATA) area providing 120 MB of data storage on the PSRAM bus, eliminating the need for an ATA physical interface. In addition, the SST88VP1107 offers a built-in flash file system (FFS), memory management unit (MMU) and hardware error checking and correcting (ECC) engine. The hardware ECC engine corrects up to eight random-bit errors and is tailored for advanced multilevel cell (MLC) and single-level cell (SLC) NAND technology. Together, the FFS, MMU and the ECC engine make the NAND flash memory management transparent to the host system, eliminating the need for additional hardware and software on the host, and reducing the effort and time required for software development.

By intelligently managing all memory components with a resident 32-bit microcontroller, All-in-OneMemory offers a large and expandable XIP area, instant secure boot, memory demand paging, NAND flash management, and industry standard ATA data storage protocol on a single PSRAM bus in a 10 mm x 13 mm x 1,4 mm LBGA package, thereby reducing system complexity and lowering overall cost.

Added benefits of All-in-OneMemory are fast boot time, optimised memory resource sharing and advanced NAND flash technology support. These benefits are made possible by the dedicated SuperFlash boot NOR, expandable PNOR, built-in system RAM, programmable memory block boundaries and robust hardware ECC circuitry.



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