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Visitor
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Registered: ‎11-19-2013

VCU110 QDR memory

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I was looking on the VCU110 schematic at the QDR interface and it shows A19 as going to C6 of the QDR ram.

I checked this pin (C6) from 3 ram manufactures and it shows C6 as a NC pin. There is a note on the schematic

which eludes to BL 2 and BL 4 transfers.

 Does anyone have anymore information on this?

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Moderator
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Registered: ‎07-23-2015

Re: VCU110 QDR memory

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@kguzzino Believe that C6 pin (A19 address) is additional address pin for Two-Word Burst Length QDR's. For Four-Word Burst Length QDR it is No connect.

You may have checked all 3 RAM manufacturers of Four-Word Burst Length QDR and so see the NC. Try checking a Two-Word Burst Length QDR datasheet and I think C6 should be an address pin. 

- Giri
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Moderator
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4,570 Views
Registered: ‎07-23-2015

Re: VCU110 QDR memory

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@kguzzino Believe that C6 pin (A19 address) is additional address pin for Two-Word Burst Length QDR's. For Four-Word Burst Length QDR it is No connect.

You may have checked all 3 RAM manufacturers of Four-Word Burst Length QDR and so see the NC. Try checking a Two-Word Burst Length QDR datasheet and I think C6 should be an address pin. 

- Giri
--------------------------------------------------------------------------------------------------------------------
There's no such thing as a stupid question. Feel free to ask but do a quick search to make sure it ain't already answered.
Keep conversing, give Kudos and Accept Solution when you get one.
-----------------------------------------------------------------------------------------------------------------------

View solution in original post

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Visitor
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Registered: ‎11-19-2013

Re: VCU110 QDR memory

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Thanks. That's what I needed.

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