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Visitor
Posts: 7
Registered: ‎11-19-2013
Accepted Solution

VCU110 QDR memory

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?


Accepted Solutions
Moderator
Posts: 1,041
Registered: ‎07-23-2015

Re: VCU110 QDR memory

@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. 

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Moderator
Posts: 1,041
Registered: ‎07-23-2015

Re: VCU110 QDR memory

@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. 

----------------------------------------------------------------------------------------------
Kindly note- Please mark the Answer as "Accept as solution" if information provided is helpful.

Give Kudos to a post which you think is helpful and reply oriented.
----------------------------------------------------------------------------------------------
Visitor
Posts: 7
Registered: ‎11-19-2013

Re: VCU110 QDR memory

Thanks. That's what I needed.