DFI - ddr-phy.org

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DDR timing consecutive read/write or mix of them with different chip select

Hello everybody,  I meet some problems concerned to the timing between command read to read, write to write, read to write and write to rea…

Started by Victor

0 Feb 7


Hello, In MPSM entry with PDA mode, which exits first?  MPSM or PDA? Thanks in advance!

Started by Prateek

0 Jan 31

DFI data width

Hello, I'm new to this topic. Can you tell me why dfi write data bus width is generally twice the width of DRAM data bus? Is this because o…

Started by Prateek

1 Jan 24
Reply by John MacLaren

DFI training in 5.0

Hello, I am wondering why the training interface is removed in the latest DFI 5.0 specs. It is mentioned in the release information that t…

Started by Ramy Ahmed Ali

1 Nov 12, 2018
Reply by John MacLaren

x4 and x8 and x16

In DDR3 as we are having 8n prefetch, that means we are sending/receiving 8 words of data per one WR/RD command.How will they get arranged…

Started by pradeep vetapalem

0 Oct 18, 2018

PHYMSTR collision with LP

Can anyone explain the result for the below scenario: MC initiated a LP_CTRL_REQ and PHY gave an LP_CTRL_ACK. But after the LP_REQ got de-a…

Started by pradeep vetapalem

2 Sep 21, 2018
Reply by John MacLaren

Control Update

Does control update works independent of PMI? If Yes, is it not a violation of PHY Master protocol? 

Started by pradeep vetapalem

0 Sep 10, 2018

Update vs Training

Can anyone explain difference between purposes why phy initiates update and master protocols?"

Started by pradeep vetapalem

2 Aug 30, 2018
Reply by pradeep vetapalem

tphy_wrlat + twrdata for LPDDR4 in DFI5 spec

Hi, In the earlier version of the DFI spec for 1:2 freq ratio, tphy_wrlat even/odd value with tphy_wrdata being even/odd value will result…

Started by WeeHow

1 Jul 27, 2018
Reply by WeeHow

tphy_wrlat for LPDDR4 in 1:2 frequency ratio

Hi, I have a query on the diagram "LPDDR4 Write Command, 1:2 Frequency Ratio", which is figure 44 in DFI 5.0. This shows tphy_wrlat from…

Started by Stephen Bond

2 Jul 20, 2018
Reply by Stephen Bond


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