Cyclone® V SX, ST and SE SoC Device Errata

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ID 683618
Date 9/25/2015
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Document Table of Contents
Document Table of Contents x
1. Cyclone® V SX, ST and SE SoC Device Errata
1. Cyclone® V SX, ST and SE SoC Device Errata x
1.1. Intel® -Specific SoC Errata for Cyclone® V SX, ST, and SE SoC Devices 1.2. Arm* Cortex* -A9 MPCore* and L2 Cache Errata 1.3. Revision History for Cyclone® V SX, ST, and SE SoC Device Errata
1.1. Intel® -Specific SoC Errata for Cyclone® V SX, ST, and SE SoC Devices x
1.1.1. Hard Processor System (HPS) 1.1.2. FPGA
1.1.1. Hard Processor System (HPS) x
1.1.1.1. EMAC RMII PHY Interface is Only Supported Through the FPGA Fabric 1.1.1.2. Hard Processor System Level 2 Cache Error Correction Code 1.1.1.3. Hard Processor System PLL Lock Issue After Power-on Reset or Cold Reset 1.1.1.4. HPS TAP Controller Is Reset By Cold Reset 1.1.1.5. SPI Slave Output Signals Cannot Be Isolated When Routed to the HPS Pins
1.1.2. FPGA x
1.1.2.1. External Memory Interface (EMIF) Maximum Frequency Specification Updage 1.1.2.2. Fractional PLL Phase Alignment Error 1.1.2.3. Power Connection Recommendation for Cyclone® V SoC ES Devices 1.1.2.4. Configuration via Protocol (CvP) 1.1.2.5. Usermode High Icc 1.1.2.6. False Configuration Failure in Active Serial Multi-Device Configuration x1 Mode 1.1.2.7. JTAG Programming Operation Issue
1.2. Arm* Cortex* -A9 MPCore* and L2 Cache Errata x
1.2.1. Arm* Cortex* -A9 MPU 1.2.2. Arm* L2 Cache Controller 1.2.3. Arm* CoreSight PTM
1.2.1. Arm* Cortex* -A9 MPU x
1.2.1.1. 761319: Ordering of Read Accesses to the Same Memory Location Might Be Uncertain 1.2.1.2. 775420: Particular Data Cache Maintenance Operation Which Aborts Might Lead to Deadlock 1.2.1.3. 782772: Speculative Execution of LDREX or STREX Instruction After a Write to Strongly Ordered Memory Might Lead to Deadlock 1.2.1.4. 761320: Full Cache Line Writes to the Same Memory Region From Both Processors Might Cause Deadlock 1.2.1.5. 845369: Under Very Rare Timing Circumstances Transition into Streaming Mode Might Create Data Corruption 1.2.1.6. 740657: Global Timer Can Send Two Interrupts for the Same Event 1.2.1.7. 751476: Missed Watchpoint on the Second Part of an Unaligned Access Crossing a Page Boundary 1.2.1.8. 754322: Faulty MMU Translations Following ASID Switch 1.2.1.9. 764369: Data or Unified Cache Line Maintenance by MVA Fails on Inner-Shareable Memory 1.2.1.10. 782773: Updating a Translation Entry to Move a Page Mapping Might Erroneously Cause an Unexpected Translation Fault 1.2.1.11. 794072: A Short Loop Including DMB Instruction Might Cause a Denial of Service When the Other Processor Executes a CP15 Broadcast Operation 1.2.1.12. 794073: Speculative Instruction Fetches with MMU Disabled Might Not Comply with Architectural Requirements 1.2.1.13. 794074: A Write Request to an Uncacheable, Shareable Normal Memory Region Might be Executed Twice, Possibly Causing a Software Synchronization Issue 1.2.1.14. 725631: ISB is Counted in Performance Monitor Events 0x0C and 0x0D 1.2.1.15. 729817: MainID Register Alias Addresses Are Not Mapped on Debug APB Interface 1.2.1.16. 729818: In Debug State, the Next Instruction is Stalled When the SDABORT Flag is Set Instead of Being Discarded 1.2.1.17. 751471: DBGPCSR Format Is Incorrect 1.2.1.18. 752519: An Imprecise Abort Might Be Reported Twice on Non-Cacheable Reads 1.2.1.19. 754323: Repeated Store in the Same Cache Line Might Delay the Visibility of the Store 1.2.1.20. 756421: Sticky Pipeline Advance Bit Cannot be Cleared from Debug APB Accesses 1.2.1.21. 757119: Some Unallocated Memory Hint Instructions Generate an UNDEFINED Exception Instead of Being Treated as a NOP 1.2.1.22. 761321: MRC and MCR Are Not Counted in Event 0x68 1.2.1.23. 764319: Read Accesses to DBGPRSR and DBGPRCR May Generate an Unexpected UNDEF 1.2.1.24. 771221: PLD Instructions Might Allocate Data in the Data Cache Regardless of the Cache Enable Bit Value 1.2.1.25. 771224: Visibility of Debug Enable Access Rights to Enable/Disable Tracking is Not Ensured by an ISB 1.2.1.26. 771225: Speculative Cacheable Reads to Aborting Memory Regions Clear the Internal Exclusive Monitor and May Lead to Livelock 1.2.1.27. 775419: PMU Event 0x0A Might Count Twice the LDM PC ^ Instruction with Base Address Register Write-Back 1.2.1.28. 782774: A Spurious Event 0x63 Can be Reported on an LDREX That is preceded by a Write to Strongly Ordered Memory Region
1.2.2. Arm* L2 Cache Controller x
1.2.2.1. 754670: A Continuous Write Flow Can Stall a Read Targeting the Same Memory Area 1.2.2.2. 765569: Prefetcher Can Cross 4 KB Boundary if Offset is Programmed with Value 23 1.2.2.3. 729815: The High Priority for SO and Dev Reads Feature Can Cause Quality of Service Issues to Cacheable Read Transactions
1.2.3. Arm* CoreSight PTM x
1.2.3.1. 720107: Periodic Synchronization Can Be Delayed and Cause Overflow Description Impact Workaround Category 1.2.3.2. 711668: Configuration Extension Register Has Wrong Value Status
1. Cyclone® V SX, ST and SE SoC Device Errata

1.2.3.1. 720107: Periodic Synchronization Can Be Delayed and Cause Overflow

Description

The Program Trace Macrocell (PTM) is required to insert synchronization information into the trace stream at intervals in order to allow a partial trace dump to be decompressed. The synchronization period can be controlled either external to the PTM or by a counter that by default, requests synchronization every 1024 bytes of trace.

Synchronization does not need to be inserted precisely at a regular interval, so allowance is made to delay synchronization if the PTM is required to generate other trace packets, or if there is not sufficient space in the FIFO. To guarantee that some synchronization packets are always inserted regardless of the conditions, a 'forced overflow' mechanism shuts off trace if a new synchronization request occurs before the previous request was satisfied. This forced overflow mechanism is minimally intrusive to the trace stream, but ensures that synchronization is inserted after no more than 2x the requested interval.

Due to this erratum, some specific sequences of instructions prevent the PTM from being able to insert any synchronization into the trace stream while that instruction sequence continues. Typically, there is just a short delay which may not be noticed and the synchronization is inserted once the particular pattern of waypoints changes. It is possible that overflows are generated in the trace regardless of the utilization of the FIFO in the PTM. In this scenario, typically only a single byte of trace (up to 5 waypoints) is lost.

The scenario does not correspond to sustained high rates of trace generation which could genuinely cause the FIFO to become full.

Scenarios that cause this erratum are rare, and are limited to code iterating around a loop many times. The loop would contain several branches and be dependent on memory accesses completing.

This erratum can occur under the following conditions:

  1. Tracing is enabled.
  2. Branch broadcasting is disabled.
  3. Cycle accuracy is disabled.
  4. The processor executes tight loops of repeating code, lasting longer than the configured synchronization period.

Impact

This erratum reduces the frequency of periodic synchronization and potentially causes trace overflows where some trace is lost. In the case of an overflow, trace following the overflow can be correctly decompressed. This erratum is more noticeable if the periodic synchronization requests are more frequent.

Workaround

The most appropriate workaround depends on the use-case for the trace:

  • If the trace buffer is large enough, consider increasing the synchronization period by setting the ETMSYNCFR to a higher value.
  • If no trace must be lost (and periodic synchronization does not have to be guaranteed), set bit[0] of ETMAUXCR to disable the forced overflow function. Synchronization is inserted at the earliest opportunity, dependent on the executed instruction stream.

Category

Category 3

Level Two Title