DDR Error : partial row address regardless
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DDR Error : partial row address regardless

 
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seyior
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Posted: Wed Dec 08, 2004 9:21 am    Post subject: DDR Error : partial row address regardless Reply with quote
Hi,

I use V2P70 to control DDR SDRAM (HY5DU561622CT-J) in the clock of 166MHZ. The row address of this chip if [12:0].

The strange thing is that sometimes one of ddr chip will regardless parital row address[12:9]. Then this chip size is become from 16Mb * 16 to 1Mb * 16.

What kind of wrong operation will make ddr chip become this error. since the error will recover after power off-on.

BTW, reconfiguation FPGA or reinit DDR SDRAM can not help DDR chip leave from this error.

sincerely, seyor
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seyior
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Posted: Mon Dec 13, 2004 6:56 am    Post subject: Re: DDR Error : partial row address regardless Reply with quote
HI, I think I have found the problem. The board supports dynamic config FPGA via PCI I/F. Since software set FPGA's user reset to active before re-config FPGA, the DDR chip will not become error again.

reset it, before re-config it. is this a rule for XILINX? :)

regards, seyior
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