Implications on the Design
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1 Implications on the Design Ramon Canal NCD Master MIRI NCD Master MIRI 1
2 VLSI Basics Resistance: Capacity: Agenda Energy Consumption Static Dynamic Thermal maps Voltage Scaling Metrics NCD Master MIRI 2
3 Resistance In general: R AB L tw I AB V R AB AB A Material ( -m) I AB Silver (Ag) 1.6 x 10-8 L t Cupper (Cu) 1.7 x 10-8 Gold (Au) 2.2 x 10-8 W B Aluminium (Al) 2.7 x 10-8 Tugnsten (W) 5.5 x 10-8 For a given technology t is constant Basic unit of measurement: Square resistance (L=W=2 ):, R s NCD Master MIRI 3
4 In general: A L For a given technology t is constant I AB W Resistance R AB t B L tw Basic unit of measurement: Square resistance (L=W=2 ):, R s I AB V R Material AB AB Sheet Res. ( / ) n, p well diffusion 1000 to 1500 n+, p+ diffusion 50 to 150 n+, p+ diffusion with silicide 3 to 5 polysilicon 150 to 200 polysilicon with silicide 4 to 5 Aluminum 0.05 to 0.1 R s t NCD Master MIRI 4
5 Capacity Directly depending on the area In general: CLW 0 ins LW For a given technology: The permitivity ins is constant t is constant Basic unit of measurement: (L=W= 2 ): Cg t L W t LW C ( 2 2 ) C C t 4 0 ins g LW 2 g NCD Master MIRI 5
6 Power Two types: Dynamic: proportional to the activity Static: just for being there NCD Master MIRI 6
7 Dynamic Power Charging and discharging capacitors IN OUT 0 1 The capacitors are the transistors/buses connected to the output NCD Master MIRI 7
8 Dynamic Power Charging and discharging capacitors IN OUT 1 0 The capacitors are the transistors/buses connected to the output NCD Master MIRI 8
9 Static Power Short-circuit and leakage currents of the transistor IN OUT IN OUT 0 1 1/2 Leakage (sub-threshold) Short-circuit Leakage is growing dramatically ~7% (0 25μm), ~20% in (130nm) process technology, ~50% in 65nm NCD Master MIRI 9
10 Power and Energy Energy the potential for causing changes Mesured in Joules Important for Battery duration less need of energy longer life Electricity bill less need of energy saving $$ NCD Master MIRI 10
11 Energy Power and Energy Dynamic energy (CMOS): Proportional to the activity, the capacitance and the square of the supply voltage (E= CV 2 ) Static energy (CMOS): Short-circuit: E sc =t sc V DD I peak P 0 1 Leakage: E leakage =V DD I leakage NCD Master MIRI 11
12 Importance of leakage Kim et al. Leakage Current: Moore s Law Meets Static Power, IEEE Computer, NCD Master MIRI 12
13 Thermal effects on leakage The circuit simulation parameters including threshold voltage were obtained from the Berkeley Predictive Spice Models. The leakage power numbers were obtained by HSPICE simulations. Flautner et al. Drowsy Caches: Simple Techniques for Reducing Leakage Power, ISCA 2002 NCD Master MIRI 13
14 Power Power and Energy amount of work done per unit of time Measured in Watts Important for: Higher power Higher currents (I) Processors are limited (power delivery constraints) Higher power Higher temperature Processors are limited again (power envelop) NCD Master MIRI 14
15 CMOS Power and Energy P dynamic = CV 2 f ( activity factor, C: capacitance, V: voltatge, f: frequency) P static = niv (n: number of transistors off, I: leakage current, V: voltatge) NCD Master MIRI 15
16 Power Envelop / Thermal Design Power CPU power envelop Maximum power the cooling mechanisms can dissipate. Limitted by System power budget Processor power budget Usually it is around: Server <140W, Desktop W, Laptop 20-35W, PDA <10W Larger systems can afford large cooling mechanisms such as Heat sinks Heat pipes Better TIM (Thermal Interface Materials) Power distribution is important: The most uniform the distribution is the better the dissipation capabilities NCD Master MIRI 16
17 Voltage Scaling Given a voltage range, the higher the voltage the higher the frequency the circuit can opperate Good approach to trade-off power and frequency. Statically, when manufacturing the circuit Dynamically, while the circuit is opperating Intel s SpeedStep Technology Transmeta LongRun AMD PowerNow, Cool n quiet The voltage/frequency range depends on the technology used XScale proc. freq & power vs voltage Pentium IV process variations Fequency(Mhz) Power (mwatt) 0,5 0,7 0,9 1,1 1,3 1,5 1,7 1,9 NCD Master MIRI 17
18 NCD Master MIRI 18
19 Voltage Scaling (cont.) Impact on power consumption: Frequency 20% 20% voltage 35% energy reduction ( CV 2 = C(0.8V) 2 = CV % power reduction ( CV 2 f = CV 2 f0.8 3 = CV 2 f 0.51) Minimal impact on performance: Frequency 20% performance 10%-15% * Voltage scaling leverages energy consumption and performance * Depending on the ratio between the core and the external busses frequency and the cache size. NCD Master MIRI 19
20 Leveraging power and performance Voltage scaling may be not enough to reduce power We need better: 1. Designs (Computer Architecture) Power-Aware designs Energy*Delay (EDP) metrics 2. Technology (physics) NCD Master MIRI 20
21 Alpha hot spots Area 30% Freq. 50% Source - CoolChips-99 Power 67% NCD Master MIRI 21
22 Hot Spots and thermal problems Power Map Pentium IV On-Die Temperature Pentium IV Heat Flux (W/cm2) Temperature (C) 0 40 Silicon is not a good heat conductor Temperature leakage power temperature A big circuit does not help. Hot spots must be reduced. With a good layout, hotspots can be put apart and thus reducing the heat dissipation needs power envelope. * New Microarchitecture Challenges in the Coming Generations of CMOS Process Technologies Fred Pollack, Intel Corp. Micro32 conference key note NCD Master MIRI 22
23 Power Density Watts/cm i386 Hot plate i486 Pentium Nuclear reactor Pentium 4 Pentium III Pentium II Pentium Pro Rocket Nozzle New Microarchitecture Challenges in the Coming Generations of CMOS Process Technologies Fred Pollack, Intel Corp. Micro32 conference key note NCD Master MIRI 23 Power density is too high to keep the contacts cool enough
24 NCD Master MIRI 24
25 NCD Master MIRI 25
26 Power - Performance Metrics Power C V 2 f Metric: suppose we introduce a technique in the design that it has a cost in energy consumption and an effect on performance: 1. Power/Perf ( Energy), assuming the same technology and voltage. Good for: Battery life, electricity bill. Savings in a fixed power envelope without voltage scaling. 2. Power/Perf 2 ( Energy*Delay) Balance between performance and energy consumption. 3. Power/Perf 3 ( Energy*Delay 2 ) Independent of voltage scaling Good to evaluate architectural techniques that can go over the benefits of voltage scaling NCD Master MIRI 26
27 Example: Adder There exist several adder designs: Ripple, select, skip (x2), Look-ahead, conditional-sum. Each on has a different trade-off in delay and power requirements Ripple Carry Carry Select 0 1 Variable/Fixed Width Carry Skip Carry Look-ahead NCD Master MIRI 27
28 Power and Performance Figures Callaway i Swartzlander*: Energy (pj) Delay (nsec) Ripple Carry Constant Width Carry Skip Variable Width Carry Skip Carry Lookahead Carry Select Conditional Sum Better alternative: Best power constant width carry skip Best delay carry look-ahead * Estimating the power consumption of CMOS adders - Callaway, T.K.; Swartzlander, E.E., Jr. 11th Symposium on Computer Arithmetic, Proceedings. NCD Master MIRI 28
29 Conclusions VLSI Basics Resistance & Capacity are the basis. Energy Consumption Important design factor (at the moment more important than area or delay) Voltage Scaling: good but not enough New metrics for power-aware designs NCD Master MIRI 29
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