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ECE 564 (001) Fall 2025 ASIC and FPGA Design with Verilog
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Consider the following design, with these delaysInverter = FO-4 Flip-flop t_cp-Q = 2 FO4 Flip-flop t_su / t_h = FO4 Clock skew = FO4Clock has 25% duty cycleWhat is the clock cycle in a latch based design, assuming cycle stealing? Give the answer in units of FO4. For example, if its 10 FO4 just answer 10. For the purposes of this question, only solve the problem for setup violations, since I have only gave you the max logic delays and not the mins to permit a hold calculation. Give the answer to one decimal point of precision.
Note this question is quite difficult because of the feedback and answer given by straightforward application of the formula in the notes is incorrect.
The purpose of this question is to give you some practice on timing calculations, as discussed in class.Consider the circuit shown below.
Answer the following questions, using the following data:
- ·Clock skew = 750 ps
- ·T_clock_Q = (300 : 450 : 950) ps in (min:typ:max)
- ·AND delay = (70 : 120 : 210) ps
- ·OR delay = (50 : 110 : 200) ps
- ·Mux delay from D0 or D1 = (40 : 90 : 180) ps
- ·Mux delay from S = (30 : 80 : 170) ps
- ·T_setup = (100 : 200 : 300) ps
- ·T_hold = (200 : 300 : 400) ps
What is the fastest possible clock that allows worst-case circuits to work correctly without setup violations? Give your answer as a clock period ps. Do not specify the units. E.g. If the answer is 123 ps, just type in 123
Which design style would you use for a battery powered sensor used for oil field surveys? Power consumption is important but performance is low and the volume is very low.
What is the main factor that determines clock skew?
How is a hold violation fixed?
What is a setup violation?
What is the impact main impact of Moore's Law on the Semiconductor Industry.
What is a hold violation?
If you have a design with one (critical) path much longer than the others which are the generally accepted ways to fix this. Choose a combination of the following (or just one).A. Tell synthesis that this path can take two clock cycles to complete.B. Insert a pipeline register.C. Redesign the logic so that it is more "parallel" and less "serial"(Note, this question was also addressed in the revision notes)
Why is it desirable to back-annotate information back from the layout in order to do accurate timing verification.