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Avoiding embedded dram trade offs

Latest embedded dram technology offers the memory performance required by high bandwidth applications. By Gordon Fairley.

Embedded dram – the concept of merging dram with logic on a single device – has become increasingly popular, thanks to the growth of existing and emerging high bandwidth applications such as graphics processing, backbone and access router datacomms systems and base stations for mobile 'phones.

A common requirement of all these designs is that they have to process very large amounts of data at very high speeds. Because of this, a fundamental design requirement is the ability to provide high performance, high speed memory access. One way of achieving this is to use system on chip (SoC) solutions that incorporate embedded dram (eDRAM), allowing wide on chip buses to connect logic to dram on the same die, rather than to external memory. Furthermore, as noted in the last Toshiba tutorial (9 January 2001), integration of dram directly into an lsi device has the added benefits of minimising system power consumption, saving board space, reducing component count and, thanks to the elimination of external buses, reducing the effects of emi.

Go to Toshiba's site

Download a pdf version of the Toshiba Tutorial

Graham Pitcher

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