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Digital Integrated Circuits - week twelve -

Digital Integrated Circuits - week twelve -. Gheorghe M. Ş tefan http://arh.pub.ro/gstefan/ - 2014 -. Synthesis problems. 326 LUTs, f clock = 310 MHz. 97 LUTs. 33 LUTs, 506 MHz. Timing in toyRISC. The longest path is trough RALU , because in NextPC there is a 16-bit adder only

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Digital Integrated Circuits - week twelve -

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  1. Digital Integrated Circuits- week twelve - Gheorghe M. Ştefan http://arh.pub.ro/gstefan/ - 2014 -

  2. Synthesis problems 326 LUTs, fclock = 310 MHz Digital Integrated Circuits - week twelve

  3. 97 LUTs Digital Integrated Circuits - week twelve

  4. 33 LUTs, 506 MHz Digital Integrated Circuits - week twelve

  5. Timing in toyRISC The longest path is trough RALU, because in NextPC there is a 16-bit adder only Tclock = tclock_to_instruction + tleftAddr_to_leftOp + troughALU + ttroughMUX + tfileRegSU Digital Integrated Circuits - week twelve

  6. The solution to improve speed • Pipelining: • Between toyRISC and memory • On the RALU’s loop • The price for pipelining: various latencies • The problem will be solved in the course of Computer Architecture (Hennessy & Patterson: Computer Architecture. A Quantitative Approach) Digital Integrated Circuits - week twelve

  7. Four-Loop Systems • ROM on loop: • a computer with a dedicated function (embedded computing) • RAM on loop: • the generic computer • LIFO on loop: • processor with a language-oriented architecture (ex. LISP) • PROCESSOR on loop: • processor with a functional accelerator (ex. floating-point ops.) Digital Integrated Circuits - week twelve

  8. Computer: the strongest segregation between simple and complex COMPUTER = the simple PROCESSOR + the complex programs stored in RAM The function is given by: the Instruction Set Architecture The symbolic complex structure, stored in RAM, is interpreted by the simple structure of a machine Digital Integrated Circuits - week twelve

  9. Computing machine: a recursive approach • Computing machine: • The machine language (the architecture) • The storage for a program written the machine language • The machine to interpret the content of the storage: • The machine language • The storage • The machine to interpret: • … • … … • The machine to execute Digital Integrated Circuits - week twelve

  10. What about more loops? A computing machine requires at least 4 loops to be competent More loops are requested for a computing machine to improve the performance. Digital Integrated Circuits - week twelve

  11. toyMachine revisited • The behavioral description (chapter 5) is implemented with 2429 LUTs and works at 164 MHz • The structural description is implemented with 321 LUTs and works at 205 MHz • The size is reduced 7.56 times • The speed increases with 25% Digital Integrated Circuits - week twelve

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