cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
tianhufei
Visitor
Visitor
5,588 Views
Registered: ‎09-12-2016

MIG7 app_ref_req and app_zq_req signals? Do I have to controlthese signals?

  So I noticed these two signals as in UG586 saying user refresh and user zq. Does that mean that MIG automatically sends refresh and zq calibration command even if I don't do nothing to these 2 signals? 

  Is it ok that in my design I just tie these two ports to ground? 

  My uncertainty leads to the worry that if I don't send app_ref_req and app_zq_req, data gets corrupted because no one sends refresh request.

0 Kudos
6 Replies
criley
Xilinx Employee
Xilinx Employee
5,572 Views
Registered: ‎08-16-2007

As long as the USER_REFRESH parameter is set to OFF then the memory controller will continue to automatically send the periodic REFRESH commands. You can definitely run a behavioral simulation of the MIG Example Design to verify this behavior if you still have concerns.

0 Kudos
southernduck
Explorer
Explorer
2,333 Views
Registered: ‎07-09-2014

Hi,

Are you saying that if we set USER_REFRESH to ON, the memory controller will NOT send the periodic REFRESH commands EVER?

Thanks in advance.
0 Kudos
ryana
Moderator
Moderator
2,315 Views
Registered: ‎11-28-2016

Hello @southernduck,

 

Yes, that is correct.  With User Refresh enabled the controller will not automatically schedule refresh commands.

 

Also we encourage users to create new threads if they have questions because new threads have more visibility.

microchip_zhang
Explorer
Explorer
1,159 Views
Registered: ‎08-15-2017

when I  should control the  app_ref_req and app_zq_req signals? when I should let the MIG to control the the  app_ref_req and app_zq_req signals?

0 Kudos
kren
Moderator
Moderator
1,133 Views
Registered: ‎08-21-2007

With IP default settings, MIG will send refresh and ZQ calibration commands. The inputs app_ref_req and app_zq_req can be connected to '0's. 

-----------------------------------------------------Please don't forget to give kudos or accept as solution if information provided is helpful.---------------------------------------------------------------------
0 Kudos
microchip_zhang
Explorer
Explorer
1,009 Views
Registered: ‎08-15-2017

is there any condition that I must handle the app_ref_req and app_zq_req signals , but can not give the right of control to the the memory controller ?

0 Kudos