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niu_mao_ning
Observer
Observer
5,787 Views
Registered: ‎12-08-2013

mem_wait pin issue in EMC

Hi Geeks,

 

I wish to post a issue I faced while building system with emc to connect numonyx flash device in my design.

 

In emc configuration when I am choosing numonyx flash device it will generate mem_wait signal which is a handshaking signal for the proper communication between numonyx flash and the processor.

 

I made mem_wait signal and other emc signals such as mem_wen,mem_ren,mem_cen,mem_ben etc., All pins are well assigned when i am building. (for your information there is no error in ucf. I verified it) except mem_wait signal and it displays an warning as follows:

 

WARNING:MapLib:701 - Signal axi_emc_0_Mem_WAIT_pin connected to top level port
   axi_emc_0_Mem_WAIT_pin has been removed.

 

since it is removed I am not able to send my  handshaking signals through mem_wait.

 

Kindly let me know the issue Why it is removed automatically removed from device?

 

And how to resolve it?

 

I am eagerly waiting for your ideas and suggestions.

 

Every suggestions is greatly appreciated. Thanks in advance.

 

 

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8 Replies
htsvn
Xilinx Employee
Xilinx Employee
5,781 Views
Registered: ‎08-02-2007

Hi,

 

This issue was reported and is fixed in 14.2 ISE. Can you please try this in a later version than ISE 14.2?

 

--Hem

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niu_mao_ning
Observer
Observer
5,767 Views
Registered: ‎12-08-2013

Thanks for the response Hem,

 

Sorry I forget to mention the version I used. Actually I am using Xilinx 14.6 version. Still I am facing the issue of that removal of mem_wait pin from my design. Can you give any suggestion for this?

 

Thanks in advance !

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htsvn
Xilinx Employee
Xilinx Employee
5,761 Views
Registered: ‎08-02-2007

Hi,

 

Can you attach your XMP,MHS and the UCF of your design?

 

--Hem

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niu_mao_ning
Observer
Observer
5,758 Views
Registered: ‎12-08-2013

Yeah, Sure Hem

 

Here with I have attached xmp , UCF and mhs file for your reference. These files are for xilinx 14.5 version. For your information I tried it in 14.4,14.6 and 14.7 also.

 

Kindly go through it and help me to sort out the issues.

 

Thank you.

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htsvn
Xilinx Employee
Xilinx Employee
5,715 Views
Registered: ‎08-02-2007

Hi,

 

To make hte wait pin prevent from being optimized, please use this parameter in your MHS.

 

PARAMETER C_LINEAR_FLASH_SYNC_BURST = 1
 
This seems to work at my end.
 
--Hem
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niu_mao_ning
Observer
Observer
5,679 Views
Registered: ‎12-08-2013

Hi Hem,

 

Thanks for your valuable hint. let me check and come up with results....

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niu_mao_ning
Observer
Observer
5,678 Views
Registered: ‎12-08-2013

Hi Hem

I wish to have one clarification,

 

This parameter is for burst mode transfer of data(PARAMETER C_LINEAR_FLASH_SYNC_BURST = 1). If I am correct

should we set this parameter for normal data transmission (that is i mean byte by byte or 16 bit transmission of data)...?

 

Kindly clarify me,

 

Thanks.

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htsvn
Xilinx Employee
Xilinx Employee
5,595 Views
Registered: ‎08-02-2007

Hi,

 

There was a CR filed based on this issue that you were seeing. The number for it is 771045 

 

--Hem

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