AMBA Programmer s View Extensions to OSCI TLM v2.0. Nizar ROMDHANE Technical Marketing Manager RealView Tools, DSTG April, 2007

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1 AMBA Programmer s View Extensions to OSCI TLM v2.0 Nizar ROMDHANE Technical Marketing Manager RealView Tools, DSTG April,

2 Presentation Structure ARM Activities within OSCI AMBA Protocols: AXI focus AMBA PV Extensions to OSCI TLM v2.0 Support in the RealView Tools Further work 2

3 ARM activities within OSCI ARM is committed to engaging in OSCI Board level ARM is a Corporate Member in OSCI Promotion group level ARM is a Global OSCI Sponsor Working groups level OSCI TLM WG More engineering presence in the OSCI TLM WG OSCI TLM PV compliant AMBA implementation Other working groups Monitoring position and engaging when asked to help 3

4 Presentation Structure ARM Activities within OSCI AMBA Protocols: AXI focus AMBA PV Extensions to OSCI TLM v2.0 Support in the RealView Tools Further work 4

5 AMBA - History Performance 2003 ARM, working with industry partners, announces the AXI protocol AXI A high performance, flexible protocol AHB retained for compatibility and to ease the transition APB retained for support of simple, low bandwidth peripherals ASB no longer actively supported ASB AHB AXI APB Time 5

6 AXI Channel architecture AXI interface implemented as five distinct channels Write Address A0 A1 Write Data D00 D01 D02 D03 D10 D11 AXI Master Write Response Read Address A2 A3 B0 B1 AXI Slave Read Data D30 D31 D20 D21 D22 D23 Data flows in a single direction in each channel Read and Write independent can occur in parallel Burst based: One address corresponds to multiple data items 6

7 Presentation Structure ARM Activities within OSCI AMBA Protocols: AXI focus AMBA PV Extensions to OSCI TLM v2.0 Support in the RealView Tools Further work 7

8 Specific Features AXI has specific features that are not covered by the OSCI TLM v2.0 draft for public review generic payload: Security support Cache support Atomic access model There is a need for extending the generic payload to cover these features OSCI TLM v2.0 draft for public review offers an extension mechanism to do so 8

9 OSCI TLM v2.0 compliant AMBA-PV User AMBA-PV Layer SystemC licensees TLM 2.0 Interoperability Layer TLM 1.0 Common Transport Mechanism OSCI IEEE 1666 SystemC Core Language ANSI C++ C++ C++ 9

10 AMBA-PV Overview Protocol related data types Use of custom extension mechanism for additional AMBA AXI control signals Inheritance used only to add convenience methods => no additional variable tlm_custom_base tlm_request amba_pv_control amba_pv_request amba_pv_response amba_pv_status tlm_response tlm_status 10

11 AMBA-PV Overview Core API transport() tlm_transport_if amba_pv_transport_if User-layer User-layer API => read(), write(), burst_read(), burst_write() Base class for all AMBA-PV slave modules => not an sc_module => convert transport() into user-layer API calls amba_pv_if amba_pv_transport_if amba_pv_slave_base 11

12 AMBA-PV Overview Ports Master port => bound to only one interface (not for use in routers) Slave export => export_id constructor argument (optional) amba_pv_if tlm_initiator_port tlm_target_port amba_pv_master_port amba_pv_slave_export 12

13 Examples Master transport() Slave exclusive_example Illustrates use of specific AMBA protocol control information with exclusive access to a memory interop_example Illustrates interoperability with generic TLM protocol/payload with the use of amba_pv_from_tlm_bridge and amba_pv_to_tlm_bridge tlm-2.0/pass_by_example Illustrates performance penalty of TLM_PASS_BY_COPY compared to TLM_PASS_BY_POINTER tlm-2.0/custom_example Illustrates performance penalty of slightly less cumbersome payload extension mechanism tlm-2.0/custom2_example Illustrates performance gain of inheritance-based payload extension mechanism 13

14 Presentation Structure ARM Activities within OSCI AMBA Protocols: AXI focus AMBA PV Extensions to OSCI TLM v2.0 Support in the RealView Tools Further work 14

15 OSCI TLM v2.0 support in RealView Tools OSCI TLM v2.0 support is on the roadmap of RealView tools AMBA-PV OSCI TLM compliant AMBA-PV implementation in RealView ESL APIs v2.0 scheduled for June 2007 (DAC07) RealView System Generator First prototype of export of ARM PV CPU models with AMBA-PV interfaces scheduled for May 2007 Automation of ARM PV models / subsystems export is on the roadmap for v3.0 scheduled for Q RealView SoC Designer Support to OSCI TLM v2.0 compliant models import is on the roadmap for v8.0 RealView Model Compiler Support to OSCI TLM v2.0 compliant ARM models export is on the roadmap for H

16 Presentation Structure ARM Activities within OSCI AMBA Protocols: AXI focus AMBA PV Extensions to OSCI TLM v2.0 Support in the RealView Tools Further work 16

17 AMBA-PV Further work Payload extension mechanism Inheritance option to be further refined Models Additional models to be included, e.g. router, memory Examples Slightly more complex example (possibly based on pv_example from TLM 2.0 draft) Release To be done shortly after the final release of OSCI TLM v2.0 Will be provided open source and for free on ARM website 17

18 Thank You 18

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