Re: [問題] design compiler後counter(計數器)總是 …
※ 引述《maxwellee (maxwell)》之銘言:
: 我是用counter拉出來做除頻clk 結果counter老出現violation
: 請問該怎麼處理呢?
: 還是sdc要怎麼針對這個問題去設定呢?如set_ideal_net?dont_touch_network?
: 謝謝
"Generated Clocks"[1]
A design might include clock dividers ...
Command: create_generated_clock
另外借問個問題,為什麼有人說不建議使用DFF除頻器,
最好用PLL來作除頻器?
對於數位cell-based的設計者,如果只用DFF做除頻器感覺難度
沒有與整合PLL的難度高。
如果做純數位的DFF除頻器就很好用,那為何許多FPGA卻有提供PLL的除頻器?
那用PLL除頻器的優點在哪裡?
希望有設計過這類電路的大大能指點一下。
References:
[1] Synopsys Inc., "Synopsys Timing Constraints and Optimization User Guide,"
Version C-2009.06, p.p. 2-29, June 2009.
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http://www.cbeta.org/result/normal/T12/0396_001.htm
共勉之。
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◆ From: 218.168.2.178
※ 編輯: zxvc 來自: 218.168.2.178 (08/13 20:55)
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