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Altera_Forum
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17 years ago

Instanciate multiple DDR2 controllers ?

Hi, I have a PCI express development board with stratix II GX and 288 MB of DDRII (4 * 64 MB + 1 * 32 MB). I can access to all memory with one controller. But I would like to divide my ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

It's pretty cleat, that the PCIe Dev Kit on-board DDR2 RAM can only be utilized as a whole, either 64- or 72-bit wide memory. The simulatanous access may be achieved by interleaving read and writes through the FIFO, that is used anyway inside the DDR2 controller. Writing full rows at each access, you can come near to the said theoretical througput of 48 GB/s.

As a first step, you may calculate your total througput requirements, design an access scheme and find out, if it's feasible.