Lecture 24: Sequential Logic Design. Let s refresh our memory.
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1 Lecture 24: equential Logic esign 15 L24 1 James C. Hoe ept of ECE, CMU April 21, 2015 Today s Goal: tart thinking about stateful stuff Announcements: Read Rizzoni 12.6 HW 9 due Exam 3 on April 30 Final Exam, Fri., May 8, 8:30~11:30, GHC 4401 Handouts: HW 10 (on Blackboard) HW 9 solutions (on Blackboard later on) Lab 12 (on Blackboard later on) Conflicts? Let s refresh our memory. All sequential digital systems comprise Input Next Next tate Logic tate Output Logic 15 L24 2 Output input and output state stuff that remembers combinational stuff that computes a function (has no memory) In an execution, state is updated to a next state based on a function of the current state
2 Memory L24 3 Pure combinational logic always go from a current input to a current output without any looping back There is no notion of time, past or future To remember, must somehow incorporate previous values You mean like this? oes it remember? What does it remember? (It is easier to see if you associate a small propagation delay with wires and gates) A Better Try: the R Latch 15 L24 4 Keep in mind that? X+0=X (X+0) =X X+1=1 1 (X+1) =0 Hint: stands for set ; R for reset R Consider =0 and R=0: the NORs simply act like inverters in the feedback loop; is remembered =1 and R=0: the top NOR s output is forced to 0; the bottom NOR inverts the feedback; is set to 1 =0 and R=1: the bottom NOR s output is forced to 0; the top NOR inverts the feedback; is reset to 0 =1 and R=1: Just don t do it After asserting or R, the resulting is remembered when and R are both deasserted again If you feel brave try finding the dual
3 Level ensitive Latch 15 L24 5 E is latch enable when E is asserted follows combinationally when E is de asserted the last value is remembered Timing iagram E R E Edge Triggered Flip Flop 15 L24 6 follows only at the instant of rising edge of clock independent of at all other time Timing iagram clk E E (master slave) clk only make synchronous transitions
4 15 L24 7 ynchronous Finite tate Machines Input Next tate Logic Next FF FF FF tate FF Output Logic Output Clock special clock input symbol ynchronous Timing (implified) clock period chosen to be greater than worst case T pd 15 L24 8 Global Clock sync comb comb sync sync comb comb sync FFs latch new state sync comb comb T pd : combinational propagation delay sync No more changes to NEXT ; NEXT settles to a fxn of
5 15 L24 9 Let s play with this a bit first 1 bit FM Example 15 L24 10 Implied input: Reset, Clk Input 1 bit signal Tick you can vary its value over time, anytime you like, but only the values at the rising clock edges matter Output 1 bit signal Tock Tock should be 0 after reset Tock should become 1 and stay 1 after Tick has been 1 (as sampled on a rising clock edge) What are the two states? Tick has never been 1 since reset not the above
6 Rst Tick Clk 1 bit FM Example N logic rst clk L24 11 FF with reset Tock Clk Rst Tick Tock whatever 15 L24 12 FM as an Abstraction
7 tate Transition iagram A convenient FM abstraction tates (bubbles) best to give each state a init meaningful name output value associated with no 1 s each state (Moore machines) one state is designated as the initialization state Transitions (edges) edges are predicated by input conditions (i.e., follow this edge if condition is met) each state must have transitions for all possible input values seen 1 s Tock=1 or 15 L24 13 Let s play a bit more 15 L24 14 New design: Tock should become 1 and stay 1 after Tick has been 1 three consecutive times! or no info saw1 saw11 saw111 Tock=1 Init What if I want Tock=1 only right after each time Tick has been 1 three consecutive times; at all other times
8 Realizing an FM tate assignment require at least n= lg 2 N bits n 1,, 0 to encode an FM with N states (each bit is a flip flop) flop) assign each state to an unique encoding choice of encoding can affect the size of combinational next state logic (don t worry about it in ) Next state logic computes the next state value n 1,, 0 as a function of the FM input and current state n 1 1,,,, 0 Moore style Output logic computes the FM output as a function of current state n 1,, 0 I N tate logic 15 L24 15 O Tick Tock Example 2 states, hence a 1 bit FM no 1 s when 0 =0 seen 1 s 1s when =1 init 0 15 L24 16 Next state logic truth table 0 Tick Output logic truth table 0 Tock no 1 s seen 1 s Tock=1 or
9 state assignment tate 1 0 no info 0 0 saw saw saw Three 1 s Example next state logic 1 0 Tick output logic Tock L24 17 or no info saw1 saw11 saw111 Tock=1 Init Three 1 s Example 15 L Tick 1 Tick Rst Tick rst Tick+ 0 Tick rst 1 Tock Clk
10 Why FMs? 15 L24 19 Looking for 0s and 1s..... (this is actually serious computer science; look up regular expressions on Wikipedia) imple computation/calculations..a i..b i ci co Full Adder s sum The first and foremost practical use is to sequence the control of a datapath or a system Atmel ATmega8 atapath 15 L24 20 Page 9 Atmel 8 bit AVR ATmega8 atabook
11 FM 15 L24 21 datapath = combinational logic and registers to carry out computation (puppet) FM = combinational logic and registers for control and sequencing (puppeteer) inputs outputs FM datapath clock R Latch ual 15 L24 22 R R R
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