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How should unused Vybrid DDR pins be connected?

Question asked by Richard Donkin on Aug 16, 2013
Latest reply on Aug 23, 2013 by ChrisNielsen

I am using the VF5xx in a design for which the 1.5MB on-chip RAM is sufficient.

 

How should the DDR pins be connected in the design, given that they are unused?

 

So far I am assuming the following.

1. SDRAMC_VDD2P5 pins are connected to DECAP_V25_LDO_OUT.

2. SDRAMC_VDD1P5 pins are left floating

3. The following pins are connected to VSS:

    DDR_A, DDR_D, DDR_BA, DDR_DQM, DDR_DQS, DDR_ODT, DDR_CAS,

    DDR_CKE, DDR_CLK, DDR_CS, DDR_RAS, DDR_WE,

    DDR_VREF, DDR_ZQ, DDR_RESET.

 

Is this correct?

 

Richard

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