System Level Power with IEEE1801. Sushma Honnavara-Prasad, Secretary, IEEE P1801 WG

Transcription

1 System Level Pwer with IEEE1801 Sushma Hnnavara-Prasad, Secretary, IEEE P1801 WG

2 Pwer Mdel Data Flw: get_pwer 2415 pwer Unified pwer abstractin f cmpnents and the whle device fr FW, OS and apps develpment Describes SW/system-level clcks, vltages, states/transitins, events/cntrl, latencies/pwer Cnnects the pwer/energy design flw f HW and SW, IP prducers and integratrs (states) (states) 1801pwer (states) pwer get_pwer get_pwer pwer pwer (state, get_pwer pwer pwer f,v,t) (state, get_pwer pwer f,v,t) (state, pwer f,v,t) 2416 (mdes, 2416 transitins, (mdes, cntributrs) 2416 transitins, (mdes, cntributrs) transitins, IP Cmpnent cntributrs) IP Cmpnent Pwer IP Cmpnent Mdel Pwer IP Cmpnent Mdel Pwer Mdel Pwer Mdel IP Cmpnent Pwer State Mdel Pwer dmains fr the cmpnent Pwer state definitins per pwer dmain Legal transitins between pwer states Pwer functin fr each pwer state IP Cmpnent state-based pwer data Semantics fr pwer/energy views f cmplex IP Frmalized PVT independence Pwer cntributrs per (pwer & functinal) mde Energy cntributrs per mde transitin Cmputatinally efficient PVT binding Multi level rganizatin fr multiple views 2

3 P1801: IEEE SA Entity Based Wrk Grup

4 IEEE 1801 Timeline UPF 1.0 Kick ff Meeting UPF 1.0 Dnated t IEEE New Prject Revisin f CPF 2.0 Dnated t IEEE New Prject Revisin f New Prject Amendment f Accellera UPF 1.0 Published IEEE (AKA UPF 2.0) Published (AKA UPF 2.1) Published 1801a 2014 (AKA UPF 2.2) Published (AKA UPF 3.0) Planned 4

5 System Level Pwer (SLP) Challenge: System Level Pwer depends n perspective: SW Centric: abstract, task, transactin/event based HW Centric: detailed, cmpnent, state/level based As an industry we need t bridge this gap: Tp dwn: Add detail t the abstract SW centric wrld f system perfrmance mdelling. Bttm up: Add abstractin t detailed HW centric wrld f RTL+UPF implementatin IEEE 1801: extend UPF as far as apprpriate Raise abstractin level f pwer intent Need a better understanding f the system level requirements. IEEE 1801: wrk clsely with ther standards grups Maximize cherence and interperability Minimize divergence and duplicatin 5

6 Hw des 1801 address SLP? DOES: Represent a HW system with cmpnent pwer mdels begin_pwer_mdel, end_pwer_mdel Define pwer dmains fr the cmpnent create_pwer_dmain Define legal pwer states fr pwer dmains and state transitins add_pwer_state, add_state_transitin Identify pwer functin fr each pwer state -state { x -pwer_expr { } } DOES NOT: Describe pwer mdel stimuli Dictate pwer dissipatin algrithms Describe characterisatin methdlgy 6

7 System Level IP Pwer Mdel Enumerated pwer dmains and pwer states All pwer states f interest within the cmpnent Pwer dmains defined fr majr blcks within the IP Pwer states applied t pwer dmains Interface t IP pwer characterizatin data Pwer functins used t calculate pwer cnsumptin Characterizatin data maintained utside f pwer mdel Each pwer state has a defined pwer functin Definitin f all legal pwer state transitins All legal transitins between pwer states identified Activatin f pwer states ccurs utside f the mdel Activatin nly successful fr legal pwer state transitins 7 7

8 Interested in wrking n UPF? Jin the wrking grup! Send t inf@p1801.rg UPF.html 8 8

9 BACKUP

10 IEEE Planned Updates Extend scpe f Pwer Intent up twards System Level Add pwer mdeling and estimatin capabilities Standardised Infrmatin Mdel fr query functins and package UPF Pwer States/Transitin refinements Cnsider further UPF/CPF methdlgy cnvergence Enhance and extend Lw Pwer Methdlgy Annex Elabrate n the Successive Refinement methdlgy IEEE t be published late