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Using a Micron CellularRAM device with the AMCC PPC405EZ embedded processor

Posted: 04 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:CellularRAM? processor? DRAM? application note?

The Applied Micro Circuits Corp. (AMCC) PowerPC 405EZ embedded 32bit RISC processor provides an external memory bus that is specifically designed to interface with a x16 CellularRAM device. This technical note describes the design requirements for a seamless memory connection between the PPC405EZ and a Micron CellularRAM device.

Micron CellularRAM devices are high-speed, pseudo-SRAM memory devices developed for low-power, portable applications. These devices, which use a DRAM-based memory core, are designed to be backward compatible with the more costly 6-transistor SRAM. For seamless operation on an SRAM bus, CellularRAM devices incorporate a transparent self refresh mechanism. This hidden refresh requires no additional support from the system memory controller and has no significant impact on READ/WRITE performance.

This technical note focuses on the asynchronous/page/burst, 128Mbit, CellularRAM 1.5-compliant device, MT45W8MW16B.

View the PDF document for more information.

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