Computer Organization I CMSC 2833 CRN 10961 Test 1/Version 1 Autume 2016 a. 1101

Question

Computer Organization I CMSC 2833 CRN 10961 Test 1/Version 1 Autume 2016 a. 110111 b. 110101 c 11 0001 d. 110100 20. (Lecture 10) Find the IEEE7S4 single binary precision representation ot - Cower to b. 4187C000 C. 4287D000 d. 4286C000 SEM that the ASCil code for the letter a is 97, whi of the following hexadecimal strings represents the string "test"? a. 74657374 b. 73647273 c. 75667475 d 76677576 22. (p. 110) How many parity bits are required to correct single-bit errors for messages having a length 20 bits? b. 4 d. 6 23. (p. 110) Assuming we are using the Hamming algorithm presented in our text to design an error-correcting code, find the code word to represent the 12-bit information word 1001 0001 1010 a. 11001 0001 0101 1011 b. 11001 0001 1101 1001 c. 11001 0001 1101 1011 d. 1 0001 0001 0101 1011 24. (p. 105) Using the CRC polynomial 1011, compute the CRC code word for the information word, 101 1001. 110 0101 1001 a. 10 1100 1011 b. 10 1100 1111 c. 10 1100 1001 d. 10 1100 1100 tlol

Explanation / Answer

[15] 1100 1001 1010 0101 -> -13915 [D]

[16] 0 0 1 1 1 0 1 0
      + 0 0 0 0 1 1   1 1
---------------------------
          0 1 0 0 1 0 0 1   [C]

[17] 00111010
-     00001111
----------------------------
        01101011   [C]

[18]

      11010
     * 1011
---------------------------
100011110 [A]

[19] 1001111100 / 1100 = 110101 [B]

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