Understanding Sequential Circuit Timing

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1 ENGIN112: Inroducion o Elecrical and Compuer Engineering Fall 2003 Prof. Russell Tessier Undersanding Sequenial Circui Timing Perhaps he wo mos disinguishing characerisics of a compuer are is processor clock speed and he size of is main memory. While i is relaively easy o undersand he concep of main memory size (he number of sorage bis in he compuer), he concep of processor clock speed is a lile more difficul o grasp. In his documen we will explain wha is mean by sequenial circui clock speed, and more imporanly, how o calculae i using he iming parameers of combinaional and sequenial circui componens. T per Figure 1: Periodic Clock Signal As we have discussed his erm, edge-rigged flip flops, such as he D flip flop, are conrolled by a clock signal, such as he signal labeled in Figure 1. A clock signal is a periodic square wave which alernaes beween logic high (1) and logic low (0) values a predicable imes. The amoun of ime beween rising clock edges is called he clock period, T per, of he clock. In modern compuers he clock period is usually under 10 nanoseconds (10 ns). The inverse of he 1 clock period ( T per )isheclock frequency, f. Since he clock is used as he conrol inpu o edgeriggered flip flops, he clock frequency measures how ofen he daa is ransfered, or clocked, ino edge-riggered flip flops. A bigger clock frequency indicaes ha daa is being sored more quickly, and he sequenial circui is generaing resuls a a faser rae. Typical clock frequencies for modern compuer sysems range from 1 megaherz (MHz) o around 5 gigaherz (GHz). 1 Timing Parameers for Combinaional Logic When implemened physically, combinaional circuis, such as AND and OR gaes, exhibi cerain iming characerisics. When a binary value (0 or 1) is applied a he inpu o a combinaional circui, he change a he circui oupu is no insananeous due o elecrical consrains. Circui inpu-o-oupu delay in combinaional circuis can be expressed wih wo parameers, pd and cd, defined as follows: Propagaion delay ( pd ) - This value indicaes he amoun of ime needed for a change in a logic inpu o resul in a permanen change a an oupu. Combinaional logic is guaraneed no o show any furher oupu changes in response o an inpu change afer pd ime unis have passed. 1

2 X Y X cd cd Y pd pd Figure 2: Combinaional Propagaion and Conaminaion Delay Conaminaion delay ( cd ) - This value indicaes he amoun of ime needed for a change in a logic inpu o resul in an iniial change a an oupu [1]. Combinaional logic is guaraneed no o show any oupu change in response o an inpu change before cd ime unis have passed. An example of combinaional propagaion and conaminaion delay appears in Figure 2. When inpu X changes, he change in Y is no insananeous. The inverer oupu mainains is iniial value unil ime cd has passed. Afer his ime, he Y oupu of he inverer may be a an inermediae value for a while (indicaed by he cross-hached area) before he final oupu value is creaed. Afer he propagaion delay, pd, he inverer oupu is sable and is guaraneed no o change again unil anoher inpu change. Combinaional propagaion delays are addiive. I is possible o deermine he propagaion delay of a larger combinaional circui by adding he propagaion delays of he circui componens along he longes pah. For example, he propagaion delay of he combined circui in Figure 3 is 5 ns, since he longes delay from a circui inpu (w, x, y) o he oupu z is he sum of he componen propagaion delays hrough gaes A and B, 3 ns + 2 ns = 5 ns. The 4 ns propagaion delay pah hrough gaes C and B can be ignored in deermining he overall propagaion delay of he circui since i is shorer han 5 ns. In conras, he deerminaion of he conaminaion delay of he combined circui requires idenifying he shores pah of conaminaion delays from inpu o oupu. In Figure 3, he conaminaion delay of he combined circui is 2 ns, since he shores sum of conaminaion delays from an inpu (y) o an oupu (z), is cd (C) + cd (B) + 1 ns = 2ns. Noe ha his value is smaller han he conaminaion delay pah hrough gaes A and B (2 ns + 1ns = 3 ns). 2

3 cd pd = 3 ns w x A cd pd B z y C cd pd Figure 3: Combined Combinaional Circui Dealy 2 Timing Parameers for Sequenial Logic Like combinaional circuis, when sequenial circuis, such as edge-riggered flip-flops, are physically implemened, hey exhibi cerain iming characerisics. Unlike combinaional circuis, hese characerisics are specified in relaion o he clock inpu. Since flip-flops only change value in response o a change in he clock value, iming parameers can be specified in relaion o he rising (for posiive edge-riggered) or falling (for negaive-edge riggered) clock edge. The following parameers specify sequenial circui behavior. Unless oherwise specified, he following descripions perain o posiive edge-riggered circuis. Similar definiions can be made for negaive edge-riggered circuis. Propagaion delay ( Q ) - This value indicaes he amoun of ime needed for a change in he flip flop-clock inpu (e.g. rising edge) o resul in a permanen change a he flip-flop oupu (Q). When he clock edge arrives, he D inpu value is ransfered o oupu Q. Noe from Figure 4, ha he oupu of he flip-flop may be a an inermediae value for a while (indicaed by he cross-hached area) before he final oupu value is creaed. Afer Q, he oupu is guaraneed no o change value again unil anoher clock edge rigger (e.g. rising edge) arrives. Conaminaion delay ( cd ) - This value indicaes he amoun of ime needed for a change in he flip-flop clock inpu o resul in he iniial change a he flip-flop oupu (Q). Noe from Figure 4, ha he oupu of he flip-flop mainains is iniial value unil ime cd has passed. The flip-flop is guaraneed no o show any oupu change in response o an inpu change unil afer cd has passed. Seup ime ( s ) - This value indicaes he amoun of ime before he clock edge ha daa inpu D mus be sable. As shown in Figure 4, D is sable s ime unis before he rising 3

4 D D Q Q s h D Q cd clk Q Figure 4: Seup and Hold Time for Sequenial Circuis clock edge. Hold ime ( h ) - This value indicaes he amoun of ime afer he clock edge ha daa inpu D mus be held sable. As shown in Figure 4, he hold ime is always measured from he rising clock edge (for posiive edge-riggered) o a poin afer he edge. Seup and hold imes are resricions ha a flip-flop places on combinaional or sequenial circuiry ha drives a flip-flop D inpu. The circui mus be designed so ha he D flip flop inpu signal arrives a leas s ime unis before he clock edge and does no change unil a leas h ime unis afer he clock edge. If eiher of hese resricions are violaed for any of he flip-flops in he circui, he circui will no operae correcly. These resricions limi he maximum clock frequency a which he circui can operae. If he rising clock edges in Figure 1 are oo close ogeher, daa will no have enough ime o propagae hrough he circui o he flip-flop inpu and arrive s ime unis before he rising clock edge. 3 Deermining he Max. Clock Frequency for a Sequenial Circui Mos digial circuis conain boh combinaional componens (gaes, muxes, adders, ec.) and sequenial componens (flip-flops). These componens can be combined o form sequenial circuis ha perform compuaion and sore resuls. By using combinaional and sequenial componen parameers, i is possible o deermine he maximum clock frequency a which a circui will operae and generae correc resuls. This analysis can bes be examined hrough use of an example. A sample sequenial cicui is shown in Figure 5. Before saring iming analysis, consider he flow of daa in his circui in response o a rising clock 4

5 clk Q = 10 ns D clk Q = 10 ns cd D Q X cd pd F = 5 ns Y cd s h D Q Ou A B Figure 5: An Example Sequenial Circui edge, saring a flip-flop A. 1. Following he rising clock edge on, a valid oupu appears on signal X afer Q = 10 ns. 2. A valid oupu Y appears a he oupu of inverer F, pd = 5 ns afer a valid X arrives a he gae. 3. Signal Y is clocked ino flip-flop B on he nex rising clock edge. This signal mus arrive a leas s = 2ns before he rising clock edge. As a resul, he minimum clock period, T min of he circui is: T min = Q (A)+ pd (F )+ s (B) =10ns +5ns +2ns =17ns (1) 1 and he maximum clock frequency of he circui is T min = 1 17ns = 58.8 MHz. Waveforms ha show he deerminaion of he minimum clock period are show in Figure 6. Since he inpu is aached o boh flip-flops, boh will change value a he same ime. On each clock edge, he same hree seps saring from flip flop A are repeaed. On he nex edge, a new value is clocked ino flip-flop B ha is a resul of he previous clock edge on flip-flop A. In a ypical sequenial circui design here are ofen millions of flip-flop o flip-flop pahs ha need o be considered in calculaing he maximum clock frequency. This frequency mus be deermined by locaing he longes pah among all he flip-flop pahs in he circui. For example, consider he circui shown in Figure 7. In his example, here are hree flip-flop o flip-flop pahs (flop A o flop 5

6 D clk Q pd s X Y Ou Figure 6: Timing Waveforms for he Circui in Fig. 5 B, flop A o flop C, flop B o flop C). Using an approach similar o Equaion 1, he delay along all hree pahs are: T AB = Q (A) + s (B) =9ns+2ns=11ns T AC = Q (A) + pd (Z) + s (C) =9ns+4ns+2ns=15ns T BC = Q (B) + pd (Z) + s (C) =10ns+4ns+2ns=16ns Since he T BC is he larges of he pah delays, he minimum clock period for he circui is T min = 16 ns and he maximum clock frequency is 1 T min = 62.5 MHz. 4 Validaing Flip-Flop Hold Time Unforunaely, simply designing a circui for a specific maximum clock frequency is no enough o ensure ha he circui will work properly. As menioned earlier, he hold ime, h mus be saisfied for each flip-flop inpu, indicaing ha each D inpu canno change unil h ime unis afer he clock edge. Forunaely, he conaminaion delays of combinaional circuiry and flip-flops help preven flip-flop inpus from changing insananeously. This observaion can be illusraed by re-examining Figure 5. The hold ime requiremen on flip-flop B indicaes ha he Y inpu o flip-flop B should no change unil a leas 2 ns afer he rising clock edge of. By examining he circui, i can be seen ha he earlies he signal can sar o change is equal o he sum of he conaminaion delays of flip-flop A and inverer X. Therefore, if 6

7 clk Q = 9 ns cd s h A pd = 4 ns cd Comb. Logic clk Q = 9 ns cd s h C B clk Q = 10 ns cd s h Figure 7: Muli-pah Sequenial Circui h (B) cd (A)+ cd (X) (2) he circui is guaraneed o work correcly. Since h, 2 ns, is less han cd (A)+ cd (B), 4 ns, he hold ime is saisifed and he circui will work correcly. A similar analysis can be performed along each flip-flop o flip-flop pah in Figure 7. These hree pahs lead o he following relaionships for he A o B, A o C, and B o C pahs, respecively: h (B) cd (A) [A o B pah] (3) h (C) cd (A)+ cd (Z) [A o C pah] (4) h (C) cd (B)+ cd (Z) [B o C pah] (5) plugging in he values from Figure 7 gives: 1ns 2ns [A o B pah] (6) 1ns 2ns +2ns [A o C pah] (7) 1ns 2ns +2ns [B o C pah] (8) I is apparen ha even he fases flip-flop o flip-flop pah (2 ns) is slower ha he required hold ime (1 ns). None of he flip flop inpu values will change unil a leas 2 ns following he clock edge due o he conaminaion delays along he pahs. For each circui in he pah, he conaminaion delay guaranees ha a change in he circui inpu will no be shown a he circui oupu unil cd ime unis. 7

8 5 Conclusion Sequenial circuis rely on a clock signal o conrol he movemen of sysem daa. Given a se of combinaional and sequenial componens and heir associaed iming parameers, i is possible o deermine he maximum clock frequency ha can be used wih he circui. This analysis includes he examinaion of every flip-flop o flip-flop pah in he circui. The examinaion includes boh he propagaion delays along he pahs and he daa seup ime a he desinaion flip-flop. Following he calculaion of he maximum clock frequency, each flip-flop o flip-flop pah can be examined o ensure ha flip-flop hold imes are saisfied. If he conaminaion delays along each pah are greaer han or equal o he desinaion flip flop hold ime, he circui will operae as designed. References [1] S. Ward and R. Halsead. Compuaion Srucures. McGraw-Hill, Boson, Ma,

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