Computer Science 61CL - Fall 1998 - Fateman - Midterm 2

Computer Science 61CL - Fall 1998 - Fateman - Midterm 2 -...

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Unformatted text preview: CS61C, Midterm #2, FALL 1998 CS61c, Fall 1998 Midterm #2 Professor Fateman Problem #1 (7 points) Answer the following questions using the diagram of a full adder module: A B CarryIn | | | V V V |-------------------------| CarryOut <<< | | |-------------------------| | V Sum a. Using no more than 10 of these adders, and no more than 4 other logic symbols, draw a circuit that takes an 8 bit unsigned number X and returns the eight lower order bits of X multiplied by 5. Ignore overflow. For example, 5*0x04 is 0x14 (20 decimal), and 5*0x80 is 0x80. b. By making the inputs and outputs specifically on your diagram, show how your circuit can multiply 40 (decimal) by 5 to get 200 (decimal). Problem #2 (2 points) CDR-coding can be explained as a way of saving memory. a. How does it save memory? b. Now that memory is so cheap, can you come up with a good reason to still use CDR coding? Problem #3 (10 points) file:///C|/Documents%20and%20Settings/Jason%20Raft...%20Fall%201998%20-%20Fateman%20-%20Midterm%202.htm (1 of 4)1/27/2007 6:35:29 PM CS61C, Midterm #2, FALL 1998 a. Given the address 0xA2EC4A8F, compute the block offset, set number and tag for each of the following caches: Size(bytes) Width (bytes) Policy Offset Set Tag in HEXADECIMAL 4096 4 Direct-Mapped 1024 16 4-way set associative 2048 32 Fully Associative Problem #4 (7 points) Stride 4 8 16 32 64 128 256 512 Size 32 205 212 206----- 64 221 203 213 202---- 128 214 243 232 212 204--- 256 227 235 241 233 216 231-- 512 598 523 543 1311 1285 1289 321- 1024 543 521 514 1294 1314 1306...
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Computer Science 61CL - Fall 1998 - Fateman - Midterm 2 -...

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