請問：DE1 SDRAM問題

wucc007isme

請問我利用DE1光碟的DE1_SD_Card_Audio範例

並利用NIOS II IDE執行MemoryTest

可以成功執行SDRAM測試

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但我用Quartus 7.0 的SOPC Builder重新Build後

再Quartus II Compiler重作同樣實驗
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卻會出現下列錯誤：
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Using cable "USB-Blaster [USB-0]", device 1, instance 0x00
Pausing target processor: not responding.
$ Q$ D9 d( W& I/ l& \9 ?Resetting and trying again: OK
Initializing CPU cache (if present)
* F$ |7 Q' x& h, [2 M* qOK
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Downloading 00800020 ( 0%)
Downloading 00810000 (67%)
  D3 P& i/ e& ]7 XDownloaded 95KB in 1.1s (86.3KB/s)
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( |; g0 H0 {) u9 TVerifying 00800020 ( 0%)
Verify failed between address 0x800020 and 0x80FFFF
Leaving target processor paused

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很多文章說明PLL設-3 ns,也有專家說要改成-11ns~-18ns
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6 f( O3 \; S' q( m我試過還是不行

9 B+ ]. n2 r. ~0 ]  N可否請問是軟體問題？