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su07 final - ECE 152A Summer 2007 University of California...

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ECE 152A – Summer 2007 8/29/2007 Final Exam – Page 1 of 18 University of California, Santa Barbara Department of Electrical and Computer Engineering ECE 152A – Digital Design Principles Final Exam August 29, 2007 Name _____________________________________ Perm # ____________________________________ Lab Section _______________________________ Problem #1 (25 points) ____________ Problem #2 (25 points) ____________ Problem #3 (25 points) ____________ Problem #4 (25 points) ____________ Total (100 points) ____________ This is a 75 minute exam; closed book, closed notes, no calculators. Answer all questions on the exam.
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ECE 152A – Summer 2007 8/29/2007 Final Exam – Page 2 of 18 Problem #1. Complete the functional (zero delay) timing diagram below for the circuit realized by the following Verilog code: module final (clock,x,z1,z2); input clock,x; output z1,z2; wire z1; reg z2; reg [1:0]state; assign z1 = x & state[1] | ~x & ~state[1] & ~state[0]; always @ (posedge clock) begin if(x) state <= state + 1; else state <= state - 1; z2 <= x & state[1] | ~x & ~state[1] & ~state[0]; end endmodule
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ECE 152A – Summer 2007 8/29/2007 Final Exam – Page 3 of 18 Problem #2. In this problem, you are to design a portion of the controller for a high definition, hard disk, digital video recorder. The controller receives four inputs from the remote control: Play/Pause (PP), When playing (1X), causes video to be frozen Otherwise, causes playing to resume Fast Forward (FF) Causes video to fast forward at 2X speed When fast forwarding, causes video to fast forward at 4X speed Rewind (RW) Causes video to rewind at 2X speed When rewinding, causes video to rewind at 4X speed Live (LV) Sets video source to live television You can assume that only one button can be pressed at any time. You can also assume that if the hard disk is rewound to the beginning, it will automatically begin playing from that point and if the hard disk is fast forwarded to the end, it will revert to playing live television.
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