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$O  =;Core-Centric Communication Protocol Introducing Open Core Protocol 2.0 Franck Seigneret, Texas Instruments France OCP-IP GSC memberDF =   " Motivation: reuse without reworkrSOC designers want to reuse IP cores to shorten development schedules. Problem: IP cores need to be re-adapted into each system design 1000s of cores, 10s or 100s of interconnects/buses must understand lots of interfaces overwhelming amount of adaptation work Motivation: reuse without rework Plug-and-play between cores and interconnects systems from different sources.}!N33,33:7} 3333@#Solution: Core/System Protocol_What is needed is a standard, well-defined protocol for cores to talk to a system interconnect..`33-$!Core/System Protocol RequirementsClearly-specified contract between core developer and system integrator Core-Centric Interconnect neutral (not some bus protocol) Encompass entire core/system interface Scalable and configurable Process independent, synthesis/timing analysis friendlyDU-yH 33-y  &Open Core Protocol 2.0Open Core Protocol (OCP) is a core-centric protocol under the governance of the OCP-IP association to enable true core plug-and-play and re-use This is an OPEN standard OCP-IP is driven by a pool of key players in the semiconductor industry: Nokia, Texas Instruments, STMicroelectronics, UMC, MIPS, Philips, Sonics, EDA vendors& Multiple working groups (specification, functional verification, SystemC modeling& ): make of OCP a  living standard Think of OCP as configurable core socket OCP 2.0 specification (and much more) can be freely downloaded from the OCP-IP web site: www.ocpip.org uIWu33h> l 'Basic OCP Concepts~Point-to-point, uni-directional, synchronous Easy physical implementation Master/Slave, Request/Response model Well-defined, simple roles Extensions Added functionality to support cores with more complex interface requirements Configurability Match a core s requirements exactly Tailor design to required features only -% NM-% N M  ( Basic OCP|Master / Slave Split protocol Multiple phases: Request phase Response phase Separate data handshake (optional) System / Core6/@/@< OCP commandsIdle& Read transfer Standard Read ReadEx, ReadLinked for exclusive access Write transfer With or without response Posted (Write) or non posted (WriteNonPost) semantics Conditional (WriteConditional) for exclusive access Exclusive accesses Locked synchronization Atomic ReadEx / Write pairs Lazy synchronization Non atomic ReadLinked / WriteConditional pairslP6PPPPPPP/P33  33 33!33 3333    /P"H<) HandshakingEach phase starts when sender asserts the phase for example, request phase starts when master sends a non-idle command Phase ends when receiver asserts handshake for example, request phase ends when slave asserts the command accept signal Handshaking allows both sides to assert flow control sender can delay asserting the phase receiver can delay asserting the handshake Example: core can t take a request every cycle no need to add storage, just hold off on accepting requests if not ready0G+M5PP/I G+M5P/  I=Handshake (Timing Diagram)*Ordering and PipelininguAn OCP transfer is a complete request/response interaction For longer latency operations would like pipelining multiple requests can be sent before first response comes back example: CPU core has multiple outstanding cache misses OCP allows pipelining of transfers Responses must be returned in the order of the requests Requests and responses form a single ordered thread pow33`w33? OCP phases within a transfer  ,OCP Simple Extensions  -Burst extensionMultiple OCP transfers can be linked into a burst transaction Cores such as DRAM controllers can supply the second related piece of data much faster than the first Bursts allow a target to know that there are more transfers coming, so it can pre-fetch Bursts are linked together using a burst code that is supplied with every transfer burst signaling supplies the burst address sequence, the burst length, the burst type, etc....p>S_ 3333S_@ The OCP burst flexibilityAbility to handle precise bursts (the length is known) and un-precise bursts (the length is unknown). Ability to specify standard address sequences (incrementing, wrapping, streaming, XOR) as well as custom address sequences. Ability to support single request/multiple data transaction models. Ability to define atomic sub-units within a burst for fine control of the request interleaving throughout the system interconnect. Ability to add complete framing information with all transfer phases.Z33" 33P&33:3333  /Threading extensionWithin an OCP thread, responses must return in the order of the requests. For some cores, out-of-order responses are desirable A multi-bank DRAM controller can return requests to an open bank faster than to a closed one A DMA controller can handle multiple outstanding transactions from multiple channels on the same OCP port An OCP interface can support multiple threads Allows for concurrency and out-of-order returns Each thread retains strict ordering semantics BUT: there are is no ordering between transfers in different threadsd.330Threads (illustrated)Golden rule Strict ordering within a thread No ordering between threads Requests, data, responses are tagged with a threadID Multithreading also helps reducing the number of wires, to limit the routing congestions = 333333, 33YuZ  1Control and Test SignalspReset Interrupt Transaction error reporting Core Flags (core-to-core) Core Status/Control (system-to-core) Test: Scan chains and standard JTAG (IEEE1149) & and platform specific signalsZ3ConfigurabilityOCP is configurable to tailor the interface exactly to the features required by the core Basic OCP is very simple Many extensions exist for cores with more complex interface requirements OCP is configured via a set of parameters Control the presence of a set of signals example: core makes use of byte enables Control the width of a set of signals example: address width is 14 bits Control protocol features example: core uses data handshaking to pipeline write dataYb*)(&";Yb*)(&  "  ;6OCP as IP Core Delivery Vehicle(OCP is not just a core/system interface specification OCP also specifies: Precise description format for core interfaces Precise description format for timing of core interfaces Core performance information Configuration information is in machine-readable TCL file format Allows for automated processing, at both core and interconnect level Core designer and system integrator s job is greatly simplifiedjJAE@JAE@8"System Usage of Open Core Protocol    9Related Work / Conclusion\Virtual Socket Interface Alliance (VSIA) has also putting forth the idea of a standard IP core socket Virtual Component Interface (VCI) VCI and OCP are completely aligned in terms of their goals October 2003: VSIA endorses the OCP interface, OCP-IP becomes the first VSIA adoption group The recently unveiled ARM AXI specification also refers to the same foundations, a well as many company in-house protocols& This re-enforces the pioneer role played by OCP. Today, only OCP can be presented as the de-facto industry standard for a core complete socketg";]|g";]|3333 THANK YOU ! For more information, please take a look at http://www.ocpip.org/ and& stop at the OCP-IP booth in this conference centern ,7*9 9B 09N   ` 33` Sf3f` 33g` f` www3PP` ZXdbmo` \ғq>9y`Ӣ` 3f3ff` 3f3FKf` hk]wwwfܹ` ff>>\`Y{ff` R>&- {p_/̴>?" dd@$|?" dd@  " @ ` n?" dd@   @@``PR    @ ` ` p>>  (   `  s *".n   8[#A" VV  S !A"tP   C A"t  6T "#  T Click to edit Master title style! !$  0 "  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  0x "`u  X*  0 "`5  t *&3f   0 "%   ^* H  0޽h ? 33 jOCP-IP Presentation Template--CenteredConfidential-w#  =50 (  n   2"4A#" `@   6G))#" `N > P   C A"#h  2A"  6J "p  T Click to edit Master title style! !  00M " U   W#Click to edit Master subtitle style$ $  0Q "`U  X*   0V "e   v* 0     0[ "`  Z*H  0޽h ? 33Z 0 p(j(  ( ( Nh kk  ?%   x* K%%KKood ( c $ ?XK   4 ( N kk  )   RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S ( TTkk z    v* K%%KKoo ( TH kk  ?   x* K%%KKoo> ( N kk @%    TOCP-IP CONFIDENTIAL  NOT TO BE DUPLICATED++ K%%KKooH ( 0.k ? 3380___PPT10.q:L 2*0(    N,& kk  ?%   x* K%%KKoo  T0 kk z    v* K%%KKoo  T3 kk  ?   x* K%%KKoo>  NH= kk @%    TOCP-IP CONFIDENTIAL  NOT TO BE DUPLICATED++ K%%KKooH  0.k ? 3380___PPT10.#Jw-K0  @4(  4x 4 c $ec   H 4 0޽h ? 33y___PPT10Y+D=' = @B +.-K0 =5h(  h h 6PD<4___PPT9 Motivation / Background The Open Core Protocol 2.0 Basic OCP OCP simple extensions Burst extension Threading extension OCP as a system socket Related work / conclusion.@ 3f @fV6 h <Ŭn" b*Introducing OCP 2.0& .$H h 0޽h ? 33y___PPT10Y+D=' = @B + -K0 &0 6(  0 ~ 0 s *LǬ#   x 0 c $Pˬ?  H 0 0޽h ? X(=^___PPT10e.+D=' = @B + -K0   &<4  (  4 ~ 4 s *߬#   ~ 4 s *`լ  ^ 4 6 l N <4 N,$D 0" 4  C x""`S EN o On-chip interconnect< (" 4  C "` v  :Core 1 4  3 "` h  ^core i/f   4  3 p"`\   A System socket<b  4  # GHQv $S TB +4 c $DԔ   TB ,4 c $DԔ . 4 " .4  C @"` F v  :Core 2 /4  3 "`:  h  ^core i/f   04  3  "` \ ]  A System socket<b 14  # GHQ v i S " 24  C "`av  :Core N 34  3 P"` lh  ^core i/f   44  3 D"`J\   A System socket<b 54  # GHQ=v S `B 74  0D1    84  <\X  ACore designers 94  << B  CSystem integratorZB :4 s *Du u ZB ;4  s *Dz z `r 64  0TE H 4 0޽h ? X(=^-%___PPT10+K?D' = @B D' = @BA?%,( < +O%,( < +D' =%(D' =%(D+' =4@BB BB%(D' =1:Bvisible*o3>+B#style.visibility<*<4 %(D' =-g6B fade*<3<*<4 + -K0 &8 <(  8 ~ 8 s *#   ~ 8 s *   H 8 0޽h ? X(=^y___PPT10Y+D=' = @B +>-K0 ME`& (     6D<4___PPT9 Motivation / Background The Open Core Protocol 2.0 Basic OCP OCP simple extensions Burst extension Threading extension OCP as a system socket Related work / conclusion>@ 3fu3f @fV6  < +n" b*Introducing OCP 2.0& .$H  0޽h ? 33y___PPT10Y+D=' = @B + -K0 '@ <(  @ ~ @ s *p`#   ~ @ s *}x  H @ 0޽h ? f3|y___PPT10Y+D=' = @B + -K0  'D <(  D ~ D s *<#   ~ D s *t=  H D 0޽h ? X(=^y___PPT10Y+D=' = @B +>-K0 MEp& (     6CD<4___PPT9 Motivation / Background The Open Core Protocol 2.0 Basic OCP OCP simple extensions Burst extension Threading extension OCP as a system socket Related work / conclusion>@ 33f k3f @fV6  <Rn" b*Introducing OCP 2.0& .$H  0޽h ? 33y___PPT10Y+D=' = @B +o -K0 ~v0'1H (  H ~ H s *@##   ^ -H 6p ,H  c &AW ??"?E.-  r 0H S    H H 0޽h ? X(=^y___PPT10Y+D=' = @B +*$ -K0 80p( (   ~  s *\#     c $];A<$ 0  ^  6H  0޽h ? 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X(=^___PPT10e.+D=' = @B +j7 -K0 y6q6(ZZ  6(   ~  s * #   K5F T   <6N     u HB   C  HB   C uv HB   C  HB   C y z HB   C   HB   C }~ HB   C  HB   C  HB   C %&HB   C I%u&HB   C u%&HB   C %&HB   C % &HB   C M %y &HB   C y % &HB   C  % &HB   C  %!&HB   C Q%}&HB   C }%&HB   C %&HB   C %%&HB   C U%&   6 Cc G1*    6Dc G2*    6  G c G3*    6  c G4*    6Kc G5*    6 c G6*  !  6Pc G7*  "  6 B N #  S oN $  S  N %  S s  N &  S  N '  S wN (  S N )  S { *  zB1C DE F5% 1@% +  zB6CDE F5%6@%i ,  zB5CDE F5%5@i -  zB6CDE F5%6@ .  zB5CDE F5%5@)  /  zB6CDE F5%6@) m  0  zB5CDE F5%5@m   1  zB6CDE F5%6@   2  zB5CDE F5%5@ - 3  zB6CDE F5%6@-q 4  zB5CDE F5%5@q 5  zB6CDE F5%6@ 6  zB6CDE F5%6@7 7  zB5CDE F5%5@7u 8  zBCDE F5%@u 9  # BClDEF&5%6ljl6j@`q  :  6:R RCmd12  ;  # BClDEF&5%6ljl6j@`   <  6(   RCmd22  =  # BClDEF&5%6ljl6j@`w >  6 RCmd32  ?  6lĺ?% IClk*  @  6HúI{ JMCmd*  A  6(ͺDp  KMAddr*  B  0,ѺT Bm  P SCmdAccept*    C  zB5CDE F5%5@%B D B 3 rD1?q E  # BClDEF&5%6ljl6j@`y U  F  6պ=a\  SAddr12  G  # BClDEF&5%6ljl6j@`  U  H  6ں  c  SAddr22   I  C BClDEF&A5%6ljl6j@`Dark vertical q\  J  zB6CDE F5%6@   K  zB5CDE F5%5@  B L B 3 rD1?q  B M B 3 rD1?   B N # lD(o?)  O  C x(1?   Q valid command( 2 P  # l1?X  5 2 Q  # l1?  5 B R # lD(o?.   S  C x1?  Q Cmd1 accepted(  T  C xP1?m | Q Cmd2 accepted( 2 U  # l1?t V  # BClDEF&5%6ljl6j@`vV  W  68j  SAddr32  X  c BClDEF&AA5%6ljl6j@`Dark vertical xB Y   fD1? " " B Z # lD(o?w 9 H  0޽h ? f3|y___PPT10Y+D=' = @B +- -K0 `'!!T (  T ` !T s *"` g~ T s * #   x T c $o    T C x1? oh JTime*3z   o\ T   o<,$D 0B T  3 rDjJ?i o  T  C x1?  1  LMaster* T  C x1?o 1\ KSlave*-z p   T  P ,$D 0B  T  # lDԔ?"7   T  C x 1?p XW  O12 -z 'p   T  P ',$D 0B  T  # lDԔ?7  T  C x1?'p W  O22 -z "p  T  P " ,$D 0B T  # lD:Ԕ?7  T  C x$1?"p W  O32: #z E p  T  P E ,$D 0B T  # lDԔ? 7  T  3 r1?E p W  K4. 9z 7  T   ,$D 0B T 3 rDԔ?7  T  S ~L1?  O12 9z k 7   T   k  ,$D 0B T 3 rDԔ? 7   T  S ~|!1?k /  O22 9z  7  T   ,$D 0B T 3 rD:Ԕ? 7  T  S ~&1?  O32: /z '7  T   ',$D  0B T 3 rDԔ?7   T  C x+1?'  K4. H T 0޽h ? X(=^f^___PPT10>+]D"' = @B D' = @BA?%,( < +O%,( < +D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<* T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T %(D4' =%(D' =%(D' =4@BBBB%(D' =1:Bvisible*o3>+B#style.visibility<*T %(+a -K0 `X( (   `  s *"`4'ix  c $E#   ^  6j   S A ??"?h> H  0޽h ? 33___PPT10i.%+D=' = @B +>-K0 ME& (     6|KD<4___PPT9 Motivation / Background The Open Core Protocol 2.0 Basic OCP OCP simple extensions Burst extension Threading extension OCP as a system socket Related work / conclusion>@ =3fU3f @fV6  <Yn" b*Introducing OCP 2.0& .$H  0޽h ? 33y___PPT10Y+D=' = @B + -K0 p'X v(  X  X s * _X\<$ 0  \Byte enables Provide byte addressing capability on a multi-byte interface Multiple address spaces, mapped at non contiguous address ranges. Typically to: Differentiate core registers from core memory space Differentiate cores within a sub system Custom in-band signaling To any of the transfer phases: Request, response, datahandshake Typical usage: Cache signaling, application/emulation qualifier, dynamic endianness qualifier&  =P\ =P\  A a~ X s *h#   H X 0޽h ? X(=^___PPT10j+EAD' = @B D' = @BA?%,( < +O%,( < +D(' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X %(D' =-g6B fade*<3<*X D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X J%(D' =-g6B fade*<3<*X JDh' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X J%(D' =-g6B fade*<3<*X JD8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X %(D' =-g6B fade*<3<*X D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X %(D' =-g6B fade*<3<*X Dh' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X %(D' =-g6B fade*<3<*X D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X O%(D' =-g6B fade*<3<*X OD8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<*X O%(D' =-g6B fade*<3<*X O+8+0+X  +>-K0 ME& (     6D<4___PPT9 Motivation / Background The Open Core Protocol 2.0 Basic OCP OCP simple extensions Burst extension Threading extension OCP as a system socket Related work / conclusion>@ S3fE3f @fV6  <4n" b*Introducing OCP 2.0& .$H  0޽h ? 33y___PPT10Y+D=' = @B + -K0 'd <(  d ~ d s *#   ~ d s *,  H d 0޽h ? X(=^y___PPT10Y+D=' = @B +r -K0 ( P(   r  S #     S <$ 0  H  0޽h ? 33B:___PPT10.P^]+[W_D' = @B Dq' = @BA?%,( < +O%,( < +D' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<* f%(D' =-g6B fade*<3<* fD' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<* f%(D' =-g6B fade*<3<* fD' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<* &%(D' =-g6B fade*<3<* &D' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<* &%(D' =-g6B fade*<3<* &D' =%(D' =%(D8' =A@BB BB0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =-g6B fade*<3<* +8+0+  +>-K0 ME&$ (  $  $ 6D<4___PPT9 Motivation / Background The Open Core Protocol 2.0 Basic OCP OCP simple extensions Burst extension Threading extension OCP as a system socket Related work / conclusion>@ c3f13f @fV6 $ <n" b*Introducing OCP 2.0& .$H $ 0޽h ? 33y___PPT10Y+D=' = @B + -K0 '\ <(  \ ~ \ s *#   ~ \ s *佾  H \ 0޽h ? X(=^___PPT10e.+D=' = @B + -K0 '%`  (  ` ` $` s *"`Vg| ~ ` s *Ǿ#   r %` S Ⱦ M  B ` # lDo?aa ` C x;1?k Jtime* ` C x\Ҿ1?l 1@ LMaster*B  ` 3 rDԔ?zH  ` S ~<׾1?q P1A2B  ` 3 rDԔ?{[ ` S ~ܾ1?q P2A2B ` C xDԔ?q ? ` c 1?Q` w % P2A2B ` C xDԔ?q` [ ? ` S ~\1?Q. % P1A2 ` C x1?  KSlave* ` C x1?pT VThread A2 B ` 3 rD33Ԕ?0+[ ` S ~H331?C"?@Wq P1B23333B ` 3 rD33Ԕ? [ ` S ~P331?C"?P g q P2B23333B ` C xD33Ԕ?q?$ ` c  331?C"?Q'% P1B23333B !` C xD33Ԕ?qPK?$ "` c  331?C"?Q% P2B23333 #` C x 1?bpTI  VThread B2 3333H ` 0޽h ? f3|y___PPT10Y+D=' = @B +>-K0 ME&( (  (  ( 6 D<4___PPT9 Motivation / Background The Open Core Protocol 2.0 Basic OCP OCP simple extensions Burst extension Threading extension OCP as a system socket Related work / conclusion>@ w3f3f @fV6 ( <& n" b*Introducing OCP 2.0& .$H ( 0޽h ? 33y___PPT10Y+D=' = @B + -K0 'l w(  l ~ l s *( #   ~ l s *+     3 l  fL 1? p ]also known as Sideband Signals because they are out-of-band with respect to data flow signals$^]H l 0޽h ? X(=^y___PPT10Y+D=' = @B + -K0 't <(  t ~ t s *: #   ~ t s *; ]X   H t 0޽h ? X(=^___PPT10e.+D=' = @B + -K0 0( <(   ~  s *J #   ~  s *J    H  0޽h ? f3|___PPT10e.+D=' = @B +D& -K0 !!P(89 # (   ~  s *Y #    6 HLZ gֳgֳ ?B Can wrap any on-chip interconnect using OCP Yields system ready for plug-and-play with IP cores Well-specified protocol allows interconnect wrapper-generation to be automated. T,4P,4Pl , 9 ,,$D 0@   8     T(b Ԕ?   QIP Core.   Tg Ԕ?4 |  QIP Core.   Te Ԕ? '  CIP Core    Tm Ԕ?6  ^On-Chip Interconnect.)T  F   # e hT   Zs 8c? E  ?Slave(2r   B ?  r   B ?y F T F  #  h    Zpw WW8c?F @Master(2JN F   Fr   B ?r   B ?yF   Z 3)? e   Z >? e )T  F   # J     Z} 8c? E  ?Slave(2r   B ?  r   B ?y F )T  F   #  G    Zā 8c? E  ?Slave(2r   B ?  r   B ?y F )T  F   # ke T   Z0 8c? E  ?Slave(2r   B ?  r   B ?y F T F  # k    Z WW8c?F @Master(2JN F !  Fr "  B ?r #  B ?yFT F $ #  e G T %  Z WW8c?F @Master(2JN F &  Fr '  B ?r (  B ?yFT F ) # Je T *  Zt WW8c?F @Master(2JN F +  Fr ,  B ?r -  B ?yF .  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