請問：DE1 SDRAM問題

wucc007isme

請問我利用DE1光碟的DE1_SD_Card_Audio範例

. T3 f' w# v% _2 c1 F4 I! G並利用NIOS II IDE執行MemoryTest

- @% N) r4 u4 [  R+ X可以成功執行SDRAM測試
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% B8 Y& `/ H3 W1 T! h但我用Quartus 7.0 的SOPC Builder重新Build後

再Quartus II Compiler重作同樣實驗

) ?% l$ ^, S6 Y9 g卻會出現下列錯誤：

$ [" |8 s0 e2 J' f1 K; c/ u0 l* vUsing cable "USB-Blaster [USB-0]", device 1, instance 0x00
) a5 Q3 _* j: Z; T& I/ FPausing target processor: not responding.
4 e* y  l4 d8 D% x2 i/ S- rResetting and trying again: OK
+ r" G4 _' Y1 R) v& dInitializing CPU cache (if present)
OK
1 w, {* c7 \; v6 e' W
1 v& M/ [6 g% V! uDownloading 00800020 ( 0%)
Downloading 00810000 (67%)
Downloaded 95KB in 1.1s (86.3KB/s)

Verifying 00800020 ( 0%)
Verify failed between address 0x800020 and 0x80FFFF
/ a. M4 P# D  _5 E. pLeaving target processor paused



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! X9 E* B% f8 X4 U" y" H) y* p很多文章說明PLL設-3 ns,也有專家說要改成-11ns~-18ns
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我試過還是不行
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可否請問是軟體問題？