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Cs 152 L1 Intro.1 Patterson Fall 97 ©UCB CS152 Computer Architecture and Engineering Lecture 1 August 27, 1997 Dave Patterson (http.cs.berkeley.edu/~patterson)

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Presentation on theme: "Cs 152 L1 Intro.1 Patterson Fall 97 ©UCB CS152 Computer Architecture and Engineering Lecture 1 August 27, 1997 Dave Patterson (http.cs.berkeley.edu/~patterson)"— Presentation transcript:

1 cs 152 L1 Intro.1 Patterson Fall 97 ©UCB CS152 Computer Architecture and Engineering Lecture 1 August 27, 1997 Dave Patterson (http.cs.berkeley.edu/~patterson) lecture slides: http://www-inst.eecs.berkeley.edu/~cs152/

2 cs 152 L1 Intro.2 Patterson Fall 97 ©UCB What is “Computer Architecture” Computer Architecture = Instruction Set Architecture + Machine Organization

3 cs 152 L1 Intro.3 Patterson Fall 97 ©UCB Instruction Set Architecture (subset of Computer Arch.)... the attributes of a [computing] system as seen by the programmer, i.e. the conceptual structure and functional behavior, as distinct from the organization of the data flows and controls the logic design, and the physical implementation. – Amdahl, Blaaw, and Brooks, 1964SOFTWARE -- Organization of Programmable Storage -- Data Types & Data Structures: Encodings & Representations -- Instruction Set -- Instruction Formats -- Modes of Addressing and Accessing Data Items and Instructions -- Exceptional Conditions

4 cs 152 L1 Intro.4 Patterson Fall 97 ©UCB The Instruction Set: a Critical Interface instruction set software hardware

5 cs 152 L1 Intro.5 Patterson Fall 97 ©UCB Example ISAs (Instruction Set Architectures) °Digital Alpha(v1, v3)1992-97 °HP PA-RISC(v1.1, v2.0)1986-96 °Sun Sparc(v8, v9)1987-95 °SGI MIPS(MIPS I, II, III, IV, V)1986-96 °Intel(8086,80286,80386,1978-96 80486,Pentium, MMX,...)

6 cs 152 L1 Intro.6 Patterson Fall 97 ©UCB MIPS R3000 Instruction Set Architecture (Summary) °Instruction Categories Load/Store Computational Jump and Branch Floating Point -coprocessor Memory Management Special R0 - R31 PC HI LO OP rs rt rdsafunct rs rt immediate jump target 3 Instruction Formats: all 32 bits wide Registers Q: How many already familiar with MIPS ISA?

7 cs 152 L1 Intro.7 Patterson Fall 97 ©UCB Organization Logic Designer's View ISA Level FUs & Interconnect °Capabilities & Performance Characteristics of Principal Functional Units (e.g., Registers, ALU, Shifters, Logic Units,...) °Ways in which these components are interconnected °Information flows between components °Logic and means by which such information flow is controlled. °Choreography of FUs to realize the ISA °Register Transfer Level (RTL) Description

8 cs 152 L1 Intro.8 Patterson Fall 97 ©UCB Example Organization °TI SuperSPARC tm TMS390Z50 in Sun SPARCstation20 Floating-point Unit Integer Unit Inst Cache Ref MMU Data Cache Store Buffer Bus Interface SuperSPARC L2 $ CC MBus Module MBus L64852 MBus control M-S Adapter SBus DRAM Controller SBus DMA SCSI Ethernet STDIO serial kbd mouse audio RTC Boot PROM Floppy SBus Cards

9 cs 152 L1 Intro.9 Patterson Fall 97 ©UCB What is “Computer Architecture”? I/O systemInstr. Set Proc. Compiler Operating System Application Digital Design Circuit Design Instruction Set Architecture Firmware °Coordination of many levels of abstraction °Under a rapidly changing set of forces °Design, Measurement, and Evaluation Datapath & Control Layout

10 cs 152 L1 Intro.10 Patterson Fall 97 ©UCB Forces on Computer Architecture Computer Architecture Technology Programming Languages Operating Systems History Applications (A = F / M)

11 cs 152 L1 Intro.11 Patterson Fall 97 ©UCB Technology °In ~1985 the single-chip processor (32-bit) and the single-board computer emerged => workstations, personal computers, multiprocessors have been riding this wave since °In the 2002+ timeframe, these may well look like mainframes compared single-chip computer (maybe 2 chips) DRAM YearSize 198064 Kb 1983256 Kb 19861 Mb 19894 Mb 199216 Mb 199664 Mb 1999256 Mb 20021 Gb Microprocessor Logic DensityDRAM chip capacity

12 cs 152 L1 Intro.12 Patterson Fall 97 ©UCB Technology => dramatic change °Processor logic capacity: about 30% per year clock rate: about 20% per year °Memory DRAM capacity: about 60% per year (4x every 3 years) Memory speed: about 10% per year Cost per bit: improves about 25% per year °Disk capacity: about 60% per year

13 cs 152 L1 Intro.13 Patterson Fall 97 ©UCB Performance Trends Microprocessors Minicomputers Mainframes Supercomputers 1995 Year 19901970197519801985 Log of Performance

14 cs 152 L1 Intro.14 Patterson Fall 97 ©UCB Processor Performance (SPEC) RISC introduction Did RISC win the technology battle and lose the market war? performance now improves ­ 50% per year (2x every 1.5 years)

15 cs 152 L1 Intro.15 Patterson Fall 97 ©UCB Applications and Languages °CAD, CAM, CAE,... °Lotus, DOS,... °Multimedia,... °The Web,... °JAVA,... °???

16 cs 152 L1 Intro.16 Patterson Fall 97 ©UCB Measurement and Evaluation Architecture is an iterative process -- searching the space of possible designs -- at all levels of computer systems Good Ideas Mediocre Ideas Bad Ideas Cost / Performance Analysis Design Analysis Creativity

17 cs 152 L1 Intro.17 Patterson Fall 97 ©UCB Why do Computer Architecture? °CHANGE °It’s exciting! °It has never been more exciting! °It impacts every other aspect of electrical engineering and computer science

18 cs 152 L1 Intro.18 Patterson Fall 97 ©UCB Levels of Representation (61C Review) High Level Language Program Assembly Language Program Machine Language Program Control Signal Specification Compiler Assembler Machine Interpretation temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; lw$15,0($2) lw$16,4($2) sw$16,0($2) sw$15,4($2) 0000 1001 1100 0110 1010 1111 0101 1000 1010 1111 0101 1000 0000 1001 1100 0110 1100 0110 1010 1111 0101 1000 0000 1001 0101 1000 0000 1001 1100 0110 1010 1111 °°°° ALUOP[0:3] <= InstReg[9:11] & MASK

19 cs 152 L1 Intro.19 Patterson Fall 97 ©UCB Levels of Organization SPARCstation 20 Processor Computer Control Datapath MemoryDevices Input Output Workstation Design Target: 25% of cost on Processor 25% of cost on Memory (minimum memory size) Rest on I/O devices, power supplies, box

20 cs 152 L1 Intro.20 Patterson Fall 97 ©UCB Execution Cycle Instruction Fetch Instruction Decode Operand Fetch Execute Result Store Next Instruction Obtain instruction from program storage Determine required actions and instruction size Locate and obtain operand data Compute result value or status Deposit results in storage for later use Determine successor instruction

21 cs 152 L1 Intro.21 Patterson Fall 97 ©UCB The SPARCstation 20 Memory Controller SIMM Bus Memory SIMMs Slot 1MBu s Slot 0MBu s MSBI Slot 1SBusSlot 0SBusSlot 3SBusSlot 2SBus MBus SECMACIO Disk Tape SCSI Bus SBus Keyboard & Mouse Floppy Disk External Bus SPARCstation 20

22 cs 152 L1 Intro.22 Patterson Fall 97 ©UCB The Underlying Interconnect SPARCstation 20 Memory Controller SIMM Bus MSBI Processor/Mem Bus: MBus SECMACIO Standard I/O Bus: Sun’s High Speed I/O Bus: SBus Low Speed I/O Bus: External Bus SCSI Bus

23 cs 152 L1 Intro.23 Patterson Fall 97 ©UCB Processor and Caches SPARCstation 20 Slot 1MBu s Slot 0MBu s MBus Module External Cache DatapathRegisters Internal Cache Control Processor

24 cs 152 L1 Intro.24 Patterson Fall 97 ©UCB Memory SPARCstation 20 Memory Controller Memory SIMM Bus SIMM Slot 0SIMM Slot 1SIMM Slot 2SIMM Slot 3SIMM Slot 4SIMM Slot 5SIMM Slot 6SIMM Slot 7 DRAM SIMM DRAM

25 cs 152 L1 Intro.25 Patterson Fall 97 ©UCB Input and Output (I/O) Devices SPARCstation 20 Slot 1SBusSlot 0SBusSlot 3SBusSlot 2SBus SECMACIO Disk Tape SCSI Bus SBus Keyboard & Mouse Floppy Disk External Bus °SCSI Bus: Standard I/O Devices °SBus: High Speed I/O Devices °External Bus: Low Speed I/O Device

26 cs 152 L1 Intro.26 Patterson Fall 97 ©UCB Standard I/O Devices SPARCstation 20 Disk Tape SCSI Bus °SCSI = Small Computer Systems Interface °A standard interface (IBM, Apple, HP, Sun... etc.) °Computers and I/O devices communicate with each other °The hard disk is one I/O device resides on the SCSI Bus

27 cs 152 L1 Intro.27 Patterson Fall 97 ©UCB High Speed I/O Devices SPARCstation 20 Slot 1SBusSlot 0SBusSlot 3SBusSlot 2SBus °SBus is SUN’s own high speed I/O bus °SS20 has four SBus slots where we can plug in I/O devices °Example: graphics accelerator, video adaptor,... etc. °High speed and low speed are relative terms

28 cs 152 L1 Intro.28 Patterson Fall 97 ©UCB Slow Speed I/O Devices SPARCstation 20 Keyboard & Mouse Floppy Disk External Bus °The are only four SBus slots in SS20--”seats” are expensive °The speed of some I/O devices is limited by human reaction time--very very slow by computer standard °Examples: Keyboard and mouse °No reason to use up one of the expensive SBus slot

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