Sequential Circuit Design: Principle
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1 Sequential Circuit Design: Principle Chapter 8 1
2 Outline 1. Overview on sequential circuits 2. Synchronous circuits 3. Danger of synthesizing asynchronous circuit 4. Inference of basic memory elements 5. Simple design examples 6. Timing analysis 7. Alternative one-segment coding style 8. Use of variable for sequential circuit Chapter 8 2
3 1. Overview on sequential circuit Combinational vs sequential circuit Sequential circuit: output is a function of current input and state (memory) Basic memory elements D latch D FF (Flip-Flop) RAM Synchronous vs asynchronous circuit Chapter 8 3
4 D latch: level sensitive D FF: edge sensitive Chapter 8 4
5 Chapter 8 5
6 Problem wit D latch: Can the two D latches swap data? Chapter 8 6
7 Timing of a D FF: Clock-to-q delay Constraint: setup time and hold time Chapter 8 7
8 Synch vs asynch circuits Globally synchronous circuit: all memory elements (D FFs) controlled (synchronized) by a common global clock signal Globally asynchronous but locally synchronous circuit (GALS). Globally asynchronous circuit Use D FF but not a global clock Use no clock signal Chapter 8 8
9 2. Synchronous circuit One of the most difficult design aspects of a sequential circuit: How to satisfy the timing constraints The Big idea: Synchronous methodology Group all D FFs together with a single clock: Synchronous methodology Only need to deal with the timing constraint of one memory element Chapter 8 9
10 Basic block diagram State register (memory elements) Next-state logic (combinational circuit) Output logic (combinational circuit) Operation At the rising edge of the clock, state_next sampled and stored into the register (and becomes the new value of state_reg The next-state logic determines the new value (new state_next) and the output logic generates the output At the rising edge of the clock, the new value of state_next sampled and stored into the register Glitches has no effects as long as the state_next is stabled at the sampling edge Chapter 8 10
11 Chapter 8 11
12 Sync circuit and EDA Synthesis: reduce to combinational circuit synthesis Timing analysis: involve only a single closed feedback loop (others reduce to combinational circuit analysis) Simulation: support cycle-based simulation Testing: can facilitate scan-chain Chapter 8 12
13 Types of sync circuits Not formally defined, Just for coding Three types: Regular sequential circuit Random sequential circuit (FSM) Combined sequential circuit (FSM with a Data path, FSMD) Chapter 8 13
14 3. Danger of synthesizing D Latch/DFF asynchronous circuit Are combinational circuits with feedback loop Design is different from normal combinational circuits (it is delay-sensitive) Should not be synthesized from scratch Should use pre-designed cells from device library Chapter 8 14
15 E.g., a D latch from scratch Chapter 8 15
16 Chapter 8 16
17 4. Inference of basic memory elements VHDL code should be clear so that the pre-designed cells can be inferred VHDL code D Latch Positive edge-triggered D FF Negative edge-triggered D FF D FF with asynchronous reset Chapter 8 17
18 D Latch No else branch D latch will be inferred Chapter 8 18
19 Pos edge-triggered D FF No else branch Note the sensitivity list Chapter 8 19
20 Neg edge-triggered D FF Chapter 8 20
21 D FF with async reset No else branch Note the sensitivity list Chapter 8 21
22 Register Multiple D FFs with same clock and reset Chapter 8 22
23 5. Simple design examples Follow the block diagram Register Next-state logic (combinational circuit) Output logic (combinational circuit) Chapter 8 23
24 D FF with sync enable Note that the en is controlled by clock Note the sensitivity list Chapter 8 24
25 Chapter 8 25
26 Chapter 8 26
27 T FF Chapter 8 27
28 Chapter 8 28
29 Chapter 8 29
30 Free-running shift register Chapter 8 30
31 Chapter 8 31
32 Chapter 8 32
33 Chapter 8 33
34 Universal shift register 4 ops: parallel load, shift right, shift left, pause Chapter 8 34
35 Chapter 8 35
36 Chapter 8 36
37 Arbitrary sequence counter Chapter 8 37
38 Chapter 8 38
39 Free-running binary counter Count in binary sequence With a max_pulse output: asserted when counter is in state Chapter 8 39
40 Chapter 8 40
41 Wrapped around automatically Poor practice: Chapter 8 41
42 Binary counter with bells & whistles Chapter 8 42
43 Chapter 8 43
44 Decade (mod-10) counter Chapter 8 44
45 Chapter 8 45
46 Programmable mod-m counter Chapter 8 46
47 Chapter 8 47
48 Chapter 8 48
49 Chapter 8 49
50 6. Timing analysis Combinational circuit: characterized by propagation delay Sequential circuit: Has to satisfy setup/hold time constraint Characterized by maximal clock rate (e.g., 200 MHz counter, 2.4 GHz Pentium II) Setup time and clock-to-q delay of register and the propagation delay of next-state logic are embedded in clock rate Chapter 8 50
51 state_next must satisfy the constraint Must consider effect of state_reg: can be controlled synchronized external input (from a subsystem of same clock) unsynchronized external input Approach First 2: adjust clock rate to prevent violation Last: use synchronization circuit to resolve violation Chapter 8 51
52 Setup time violation and maximal clock rate Chapter 8 52
53 Chapter 8 53
54 E.g., shift register; let Tcq=1.0ns Tsetup=0.5ns Chapter 8 54
55 E.g., Binary counter; let Tcq=1.0ns Tsetup=0.5ns Chapter 8 55
56 Chapter 8 56
57 Hold time violation Chapter 8 57
58 Chapter 8 58
59 Output delay Chapter 8 59
60 7. Alternative one-segment coding style Combine register and next-state logic/output logic in the same process May appear compact for certain simple circuit But it can be error-prone Chapter 8 60
61 D FF with sync enable Chapter 8 61
62 Chapter 8 62
63 Chapter 8 63
64 Interpretation: any left-hand-side signal within the clk event and clik= 1 branch infers a D FF Chapter 8 64
65 T FF Chapter 8 65
66 Chapter 8 66
67 Chapter 8 67
68 Chapter 8 68
69 Binary counter with bells & whistles Chapter 8 69
70 Chapter 8 70
71 Chapter 8 71
72 Free-running binary counter Count in binary sequence With a max_pulse output: asserted when counter is in state Chapter 8 72
73 Chapter 8 73
74 Chapter 8 74
75 Chapter 8 75
76 Chapter 8 76
77 Programmable mod-m counter Chapter 8 77
78 Chapter 8 78
79 Chapter 8 79
80 Chapter 8 80
81 Chapter 8 81
82 Two-segment code Separate memory segment from the rest Can be little cumbersome Has a clear mapping to hardware component One-segment code Mix memory segment and next-state logic / output logic Can sometimes be more compact No clear hardware mapping Error prone Two-segment code is preferred Chapter 8 82
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