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非同步電路設(shè)計(jì)-資料下載頁(yè)

2024-09-02 14:56本頁(yè)面

【導(dǎo)讀】active之後,如果y-req也active了,則除了x-ack外,y-ack也會(huì)active,但input. y的data卻是還沒傳到下一級(jí),電路動(dòng)作發(fā)生錯(cuò)誤。的輸入可以省略,所。以可以節(jié)省一個(gè)transistor,增快電路速度。左邊是沒有Generate與Kill的電路,右邊是有Generate與Kill的電路,output為inactive,其他狀況則output不變,所以一個(gè)n-inputs的NCLgate如果數(shù)。字為1則行為如同ORgate,如果數(shù)字為n則行為如同C-element。必須在所有inputs、outputs以及internalnodes都是stable的狀態(tài)下,environment才能更改一個(gè)input的值。

  

【正文】 ncy of the input signals. (6) Complete state coding (CSC): Two or more different markings of the STG must not have the same signal values (. correspond to the same state). If this is not the case, it is necessary to introduce extra state variables such that different markings correspond to different states. The synthesis tool Petrify will do this automatically. 18. (12%)In the timing diagram, a and b are inputs and c and d are outputs. According to the diagram, draw its STG and SG, and then design c and d.(623) (1) STG (2)SG a b c d abcdd+ a a+ b+ c c+ b b+ c+ d RR00 b+ 01R0 c+ 0F10 a+ b+ 1R00 110R c 00F0 b d+ 11R1 a F110 111F d c+ (3) The Karnaugh map of c (4) The Karnaugh map of d 00 01 00 01 11 10 cd\ab 0 R 0 0 x x R x x x 1 x F 1 1 x 11 10 00 01 11 10 cd\ab 00 01 0 0 R 0 x x 1 x x x F x 0 0 0 x 11 10 C c=d+a’ b+bc abcd or set(c)=d+a’b reset(c)=b’ Ccabd d=abc’ a b c d or set(d)=abc’ reset(d)=c a b c d 19. (3%)What is the static type checking in asynchronous circuit? (pp 118) 由於在不同 data validity的元件連結(jié)時(shí),可能取擷取到 invalid 的 data 而發(fā)生錯(cuò)誤,所以在建構(gòu)完電路後必須檢查連接處的 data validity的正確性, data validity有其強(qiáng)弱性,強(qiáng)的可以包容弱的,但強(qiáng)的不可傳給弱的。 BROAD EXTENDED EARLY EARLY LATE weak strong 20. (4%)Explain the semidecoupled latch controller. (pp120) 原本的 latch必 須在下一級(jí)的 handshake完成之後才可 latch住資料 ,而 semidecoupled latch controller則在 Rout下降 後即可 latch住資料,所以 Ain可 獨(dú)立於 Rout, 使得 latch可有更高的 concurrent特性。
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