Kyle Castille ABSTRACT This document discusses power consumption Texas
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TMS320C62x/C67x Power Consumption Summary
Kyle Castille ABSTRACT This document discusses power consumption Texas Instruments TMS320C6201B, TMS320C6701, TMS320C6202, TMS320C6202B, TMS320C6203, TMS320C6204, TMS320C6205, TMS320C6211, TMS320C6711 digital signal processors (DSPs) typical applications. C6201B, C6701, C6202, C6211, C6711 DSPs manufactured TI's advanced 0.18-micron process operate with core voltage C6202B, C6203, C6204, C6205 manufactured TI's 0.15-micron process, operate with core voltage TMS320C62x TMS302C67x devices operate with 3.3-V input/output (I/O) supply, compatible with widest selection external devices. core voltage other power design optimizations allow these DSPs operate with industry leading performance power-performance ratio. data presented this document actual measured power consumption C6201, C6202,C6701, C6211. C6202B, C6203, C6204, C6205 power consumption based design simulations extrapolations from C6202. C6711 typical activity data based extrapolations from C6211 C6701 measurements.
Typical Activity Power Frequency Core Voltage Level Internal External Power Frequency (mW/MHz) Internal External 10.5
C6000 Applications Team
Device C6201B C6202 C6202B C6203 C6204 C6205 C6211 C6701 C6711
Frequency
Internal
Internal
TMS320C62x TMS320C67x trademarks Texas Instruments. Trademarks property their respective owners.
SPRA486C
Contents Activity Level Models High Activity Model Activity Model Power Measurement Results C62x/C67x DSPs Power Modes Driven Activity Power Estimate Examples Reference List Tables Summary High Activity Levels High Activity Details Summary Activity Levels Activity Levels Power Consumption High/50% Activity Details Power Consumption High/25% Activity Power Modes C6000 Devices Peripheral Power Down Power Savings C6202, C6202B, C6203, C6204, C6205 Power Substitution Additional Activity C6202, C6202B, C6203 List Examples
Table Table Table Table Table Table Table Table Table
Example Example
C6202 Power Estimate C6201B Power Estimate
Activity Level Models
TMS320C62x TMS320C67x power consumption modeled combination levels activity-high activity activity. accurate prediction application's power consumption developed based weighted averages activity levels.
High Activity Model
Table shows characteristics associated with high activity C62x/C67x DSPs. High activity represents finite impulse response (FIR) filter, fast Fourier transform (FFT), other fully optimized algorithm. Depending specific DSP, different high activity model used compare power consumption C662x/C67x DSPs equivalent basis. example, C6202 three times more internal memory than C6201B; C6203 seven times more internal memory than C6201B. typical applications, C6202 C6203 maintain most necessary code data internal memory, reducing amount sustained activity necessary implement algorithm. This reflected high activity definitions shown Table Table NOTE: power consumption increased activity levels, refer Table
C62x C67x trademarks Texas Instruments.
TMS320C62x/C67x Power Consumption Summary
SPRA486C
Table Summary High Activity Levels
High Activity C6201B/C6701/ C6204/C6205 C6211/C6711 C6202/C6202B C6203 Activity Level instructions instructions instructions instructions Program Memory Access Rate 100% 100% 100% 100% Data Memory Access Rate 100% 100% 100% 100% Memory 30-pF Load 100% access Speed 100% access access Speed access Speed
Table High Activity Details
C6201B/C6211/ C6204/C6205 High Activity writes/50% reads to/from SDRAM bits/CLKOUT2 (ECLKOUT) cycle bits/ cycles C6202/C6202B High Activity writes/17% reads to/from SDRAM/ idle bits/3 CLKOUT2 cycles bits/ cycles C6203 High Activity writes/7% reads to/from SDRAM/ idle bits/7 CLKOUT2 cycles bits/ cycles C6701/C6711 High Activity writes/50% reads to/from SDRAM bits/CLKOUT2 (ECLKOUT) cycle bits/ cycles instructions/cycle with LDDW instructions floating point operations 100% bits/cycle LDDW instructions
Module DMA/ EMIF
Data Memory
instructions/cycle with instructions
Data Memory Program Memory McBSP Timers
100% bits/cycle instructions 100% fetch packet/cycle bits/cycle channels rate timers rate (1/8 clock)
C6211/C6711 measurements made with ECLKIN frequency.
TMS320C62x/C67x Power Consumption Summary
SPRA486C
Activity Model
activity model used C62x/C67x generations DSPs identical each device. This activity level summarized Table activity represents time spent setting registers executing other less optimized code segments. actual code used model activity levels described detail Table Table Summary Activity Levels
Activity C6000 DSPs
Activity Level instructions
Program Memory Access Rate
Data Memory Access Rate (12.5%)
Memory 30-pF Load access
low-DSP-activity test cases identical C67x C62x. This test case does cycle, which represents C62x internal data memory bandwidth 12.5% C67x internal data memory bandwidth.
Table Activity Levels
Module Data memory Program memory DMA/EMIF EMIF McBSP Timers C6000 Activity instructions/cycle with instruction (12.5%) bits/cycle instruction fetch packet/4 cycles bits/4 cycles services McBSPs None channels rate timers rate (1/8 clock)
low-DSP-activity test cases identical C67x C62x. This test case does cycle, which represents C62x internal data memory bandwidth 12.5% C67x internal data memory bandwidth.
Power Measurement Results C62x/C67x DSPs
Real-world applications typically spend between percent their time performing high-DSP-activity operations, remainder their time performing low-DSP-activity operations. high/25% high/50% categories represent these applications. Depending particular application, estimate ratio high/low activity must made predict power consumption. following tables show measured power consumption C6201B, C6701, C6202, C6211 devices, estimated power consumption C6202B, C6203, C6204, C6205, C6711. Table details power consumption C6000 devices high/50% activity. Table details power consumption C6000 devices high/25% activity levels. I/Os consume significant amount total power. most code data stored internal memory, thus reducing required I/O, power consumption further reduced. addition, test measurements based high load (30pF). With less load, power consumption reduced accordingly.
TMS320C62x/C67x Power Consumption Summary
SPRA486C
Table Power Consumption High/50% Activity Details
Memory Peripherals
External Memory
High Power Power C6201B C6202 C6202B C6203 C6204 C6205 C6211 C6701 C6711 Power Total Power Total Power Total Power Total Power Total Power Total Power Total Power Total Power Total
Total 0.82 1.18 0.65 0.77 0.44 0.44 0.49 0.95 0.73
Total 0.52 0.89 0.45 0.53 0.36 0.36 0.40 0.50 0.40
Core Total 1.34 2.07 1.09 1.31 0.79 0.79 0.89 1.44 1.13
Activity
Peripheral Activity
Baseline Clocking
Baseline
Internal Memory
Total 0.36 0.26 0.29 0.22 0.36 0.36 0.19 0.31 0.19
TOTAL 1.70
0.45 0.56 0.21 0.26 0.17 0.17 0.34 0.64 0.57
0.37 0.62 0.43 0.52 0.27 0.27 23%. 0.31 0.15
0.07 0.04 0.02 0.03 0.02 0.02 0.05 0.07 0.05
0.01 0.01 0.00 0.01 0.00 0.00 0.01 0.01 0.01
0.44 0.84 0.42 0.50 0.34 0.34 0.35 0.42 0.35
0.10 0.10 0.13 0.10 0.10 0.10 0.06 0.10 0.06
0.26 0.16 0.16 0.12 0.26 0.26 0.13 0.21 0.13
2.33
1.38
1.53
1.15
1.15 1.08
1.75
1.32
TMS320C62x/C67x Power Consumption Summary
SPRA486C
Table Power Consumption High/25% Activity
Memory Peripherals
External Memory
High Power Power
C6201B
Total 0.95 1.39 0.78 0.93 0.52 0.52 0.56 1.14 0.87
Total 0.56 0.91 0.46 0.55 0.36 0.36 0.43 0.53 0.43
Core Total 1.50 2.31 1.23 1.48 0.89 0.89 0.99 1.67 1.30
Activity
Peripheral Activity
Baseline Clocking
Baseline
Internal Memory
Total 0.44 0.29 0.32 0.22 0.44 0.44 0.25 0.37 0.25
TOTAL 1.94 2.60 1.55 1.69 1.32 1.32 1.24 2.04 1.55
C6202
Power Total Power Total Power Total Power Total Power Total Power Total Power Total Power Total Power Total
0.51 0.63 0.24 0.29 0.20 0.20 0.38 0.77 0.69
0.44 0.76 0.53 0.64 0.33 0.33 0.18 0.37 0.18
0.11 0.06 0.03 0.04 0.03 0.03 0.07 0.10 0.07
0.01 0.01 0.00 0.00 0.00 0.00 0.01 0.01 0.01
0.44 0.84 0.42 0.50 0.34 0.34 0.35 0.42 0.35
0.10 0.10 0.13 0.10 0.10 0.10 0.06 0.10 0.06
0.34 0.19 0.19 0.12 0.34 0.34 0.06 0.10 0.06
C6202B
C6203
C6204
C6205
C6211
C6701
C6711
Power Modes
Table reports power consumption several special operating conditions with peripherals unused. IDLE instruction that effectively executes continuous NOPs. advantage with IDLE instruction that program fetches occur until interrupt occurs. other power-down modes (PD1, PD2, PD3) enable disable clock different portions DSP. These power modes optimal saving power during pauses application. (For more information power modes, TMS320C6000 Peripherals Reference Guide, literature number SPRU190.)
TMS320C62x/C67x Power Consumption Summary
SPRA486C
Table Power Modes C6000 Devices
Idle C6201B C6202 C6202B C6203 C6204 C6205 C6211 C6701 C6711 0.82 1.17 0.56 0.69 0.43 0.43 0.51 0.82 0.57 mW/MHz 4.10 4.67 2.25 2.30 2.15 2.15 3.42 4.90 3.83 0.62 0.90 0.45 0.54 0.36 0.36 0.35 0.58 0.35 mW/MHz 3.10 3.60 1.80 1.80 1.80 1.80 2.36 3.50 2.36
Frequency independent
Table reports power savings realized low-power peripheral modes C6202, C6203, C6204, C6205. These modes allow clock specific peripherals device turned when peripheral use. (For more detailed information peripheral power down modes, refer TMS320C6000 Peripherals Reference Guide, literature number SPRU190.) Table Peripheral Power Down Power Savings C6202, C6202B, C6203, C6204, C6205
C6202 EMIF McBSP1 McBSP2 McBSP3 0.163 0.65 0.095 0.38 0.030 0.12 0.030 0.12 0.030 0.12 C6202B 0.080 0.32 0.048 0.19 0.015 0.06 0.015 0.06 0.015 0.06 C6203 0.096 0.32 0.057 0.19 0.018 0.06 0.018 0.06 0.018 0.06 C6204 0.064 0.32 0.038 0.19 0.012 0.06 0.012 0.06 0.012 0.06 C6205 0.064 0.32 0.038 0.19 0.012 0.06 0.012 0.06 0.012 0.06
Units mW/MHz mW/MHz mW/MHz mW/MHz mW/MHz
TMS320C62x/C67x Power Consumption Summary
SPRA486C
Driven Activity
Table details power consumption resulting (direct memory access) activity from external memory C6202, C6202B, C6203 increased relative high and/or activity test cases. high power model C6202, C6202B, C6203 assumes that because greater amount internal memory present, less activity will required. This holds true most applications. NOTE: C6201/C6701 test cases incorporate full range activity. This data extrapolated from Table Table Therefore, equivalent Table necessary C6201B C6701 estimate power activity level. applications that still require high amount activity, Table used account this activity. value chosen from table should represent entire operation time. example, 100% activity performed half time, column should used. Activity levels between 50%, between 100%, approximated using linear interpolation. resulting power consumption should directly replace equivalent C6202 C6203 power summary table give total power consumption. Table Power Substitution Additional Activity C6202, C6202B, C6203
C6202 100% Activity Activity Activity C6202B 100% Activity Activity Activity 0.16 0.62 0.43 1.73 0.08 0.31 0.27 1.07 0.00 0.00 0.10 0.40 C6203 100% Activity Activity Activity 0.19 0.62 0.52 1.73 0.09 0.31 0.32 1.07 0.00 0.00 0.12 0.40 Units MW/MHz MW/MHz
External Memory (1.5 Supply) Activity (3.3 Supply)
0.24 0.94 0.43 1.73
0.12 0.47 0.27 1.07
0.00 0.00 0.10 0.40
Power Estimate Examples
numbers reported Table through Table used estimate power consumption C62x/C67x devices given application. compute power given application, following steps should taken: amount time spent executing high activity code versus activity code power modes) must estimated. Based high activity/low activity estimate, weighted average power consumption these levels calculated predict power consumption application. Step Step Calculate Core Power: Core Power (%High Activity/% Activity) Core Calculate Power Power High Activity/% Activity)
Step Calculate Total Power Total Power Core Power Power
TMS320C62x/C67x Power Consumption Summary
SPRA486C
further refine power prediction, individual components analyzed according their specific activity level obtain more accurate result. C6202, C6202B, C6203, actual level activity, power saving resulting from peripherals turned peripheral power-down register, must considered. addition, desired frequency operation different than used tables, linear interpolation used scale resulting power consumption desired operating frequency. Example C6202 Power Estimate
following example C6202 assumes that data code stored internal memory. Therefore, activity reduced high/100% level. core activity maintained typical level high/25% low. Total Power Core Power (75% High/25% Low) Power High/100% Low)
where Frequency Core High Activity 75%; Core Activity High Activity Activity 100% Because activity levels this example match activity profile already provided C6202 Table there need perform linear interpolation estimate '6202 power consumption. However, because reduced amount activity done DMA, data from Table must used replace external memory activity values shown Table Step Core power calculation Core Power250 MHz= Core Total 75/25 from Table External Memory from Table External Memory from Table 2.31 0.06 2.25 Step Power calculation Power250 Total 75/25 from Table Activity from Table Activity from Table 0.29W 0.19 0.10 0.20 Step Total power calculation Total Power Core Power Power 2.25 0.20 2.45 Since desired operating frequency MHz, frequency scaling performed.
TMS320C62x/C67x Power Consumption Summary
SPRA486C
Example
C6201B Power Estimate
following example C6201B assumes that data code stored internal memory. Therefore, activity reduced high/100% level. core activity maintained typical level high/33% low. Total Power Core Power (67% High/33% Low) Power High/100% Low)
where Frequency Core High Activity 67%; Core Activity High Activity Activity 100% predict power consumption based these characteristics, linear interpolation used determine core power consumption high/33% activity power consumption high/100% activity MHz. Step Core power calculation (1.5 1.34 W)/(75% 50%) (67% 75%) 1.45 Step power calculation (0.44 0.36 W)/(75% 50%) 75%) 0.44 Step Total power calculation Total Power200 1.45 1.65 previous calculation used data based 200-MHz measurements. Next, result must derated predict power consumption MHz. Power (Application Frequency) Power200 Application Frequency 1.65 MHz/200 1.55 Power200 MHz(0% High) (P75% High P50% High)/(75%-50%) (67% 75%) P75% High Core Power200 MHz(67% High)= (P75% High P50% High)/(75%-50%) (67% 75%) P75% High
Reference
TMS3320C6000 Peripherals Reference Guide (SPRU190).
TMS320C62x/C67x Power Consumption Summary
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