Presentation on theme: "Feng-Xiang Huang 2015/5/4 International Symposium Quality Electronic Design (ISQED), 2012 13th M. H Neishaburi, Zeljko Zilic, McGill University, Quebec."— Presentation transcript:
Feng-Xiang Huang 2015/5/4 International Symposium Quality Electronic Design (ISQED), 2012 13th M. H Neishaburi, Zeljko Zilic, McGill University, Quebec Canada.
As emerging System on Chips (SoCs) tend to have many cores, the interactions among cores through functional interconnects such as bus or Network on Chips (NoCs) are and on-chip communication has accentuated the need to enhance traditional debug methods for SoCs. In this paper, we propose a new debug aware Network Interface (NI). The proposed debug aware NI monitors the transactions issued by processing elements and extracts the global order of transactions from the local partial order of transactions. Moreover, the proposed interface provides a mechanism for a cross-triggers debugging. The modules in charge of cross-trigger debugging monitor the transaction issued by connected IP blocks and invoke appropriate debug operations at the right time. Trace data and trigger events are extracted and routed to Shared Direct Memory Access Unit( SDMAU). SDMAU combines debug traces from different NIs. The major benefits of using our proposed mechanism over traditional techniques are as follows: 1) the proposed debug aware NI can generate non-intrusively the global states of a system that involve multiple clock domains and enable validation of global properties, 2) It can detect, mark and bypass severe fault conditions such as deadlocks resulting from design errors or electrical faults in real time, 3) SDMAU maintains an efficient transfer of trace data to an external memory and there is no need for a large internal trace memory.
Runtime Checking of Serializability in Software Transactional Memory Time-stamping mechanism Intrusive Reduces the system throughput An Enhanced Debug- Aware Network Interface for Network-on-chip Effcient Network Interface Architecture for Network-on- Chips NORCHIP, 2009, Finland ISQED, 2012, Canada    Make Status register of specific core visible
Communications among cores (bus interface/ memory controller/ up) Distributed of application on NoC 。 Global vs. Local (transaction ordering) Design vs. electrical error 。 Deadlock 。 Livelock 。 Race condition 。 Data Inconsistency
a debug-aware NI Character Communication port/ debug interface Non-intrusively & Multi clock domain Compatible AXI Detect & bypass fault Efficient transfer of trace data to external memory Fig. AXI-Compatible NoC-Based System
Master Side NI Request 。 Slicer unit Response 。 Merger unit Local Debug Unit (LDU) 。 Reorder Buffer 。 Tran. Table 。 SDMAU Trace info. to external trace memory Cross Triggers Router Packetizer to Router de_Packetizer from Router Transaction packet (header/data/tail)
Master Side NI- Flow LDU 。 Tran.Table & Reorder Table Fig. NI flow
Master Side Network Interface LDU 。 Tran.Table & Reorder Table Fig. NI flow
Environment Assembly code: Factorial of consecutive number ranging from 1 to 100 Inserted design errors in side NoC routers. 94 fault pattern be detected by LDU 。 Observed that 60% data inconsistenc 32% deadlock Program (each iteration to check R0(result) by Cross trigger) ------------------------------- 1! 2! 3! … 100! Error Fig.
Proposed A debug aware NI that 。 Non-intrusively 。 Multiple clock domains system 。 Detects & bypass severe faulty condition (LDU && Trigger) 。 Compatible AXI protocol
Error information Figure 8 Issue Trace buffer/Table is widely used 。 Problem definition of behavior of SoC/NoC components 。 Specification definition