SigmaDSP Digital Audio Processor Silicon Anomaly ADAU1452 This anomaly list describes the known bugs, anomalies, and workarounds for the ADAU1452. Analog Devices, Inc., is committed, through future silicon revisions, to continuously improve silicon functionality. Analog Devices tries to ensure that these future silicon revisions remain compatible with your present software/systems by implementing the recommended workarounds outlined here. ADAU1452 FUNCTIONALITY ISSUES Silicon Revision Silicon Status Anomaly Sheet No. of Reported Anomalies C Release Rev. 0 1 FUNCTIONALITY ISSUES Table 1. Failure to Service Interrupt Request er001 Background If a certain interrupt source is active at the same time as a data memory access, there is a chance that the interrupt request will not be serviced. This can result in a missed audio sample, missed data block, or communication failure, which can manifest itself as distortion or noise on the audio outputs. Issue The failure can occur if at least one interrupt source is active at the same time as a memory access while the DSP is running. Interrupt Source used in SigmaStudio Project Memory Access During DSP Operation 2 Block processing The I C/SPI slave port is used to read from or write to the data memory 2 I C/SPI master control port The DSP core reads from or writes to the register map The failure is caused when the memory controller attempts to access the memory at the same time as an interrupt is issued by one of the previously mentioned interrupt sources. In this situation, the memory controller forces the DSP core clock to stop for 1 clock cycle. If an interrupt request happens during this brief period when the DSP core clock is stopped, the DSP misses the interrupt, and the interrupt request is cleared, even though the interrupt service routine was not executed. Workaround To avoid this functionality issue, the user must observe at least one of the two following restrictions: 2 Do not use block processing or the I C/SPI master control port in the SigmaStudio project 2 Do not access the data memory via the I C/SPI slave control port while the DSP is running This issue will be resolved in Silicon Revision D. Users must use SigmaStudio release Version 3.10 or later to avoid this issue, regardless of silicon revision. Related Issues None. SECTION 1. ADAU1452 FUNCTIONALITY ISSUES Reference Number Description Status er001 Failure to service interrupt request Resolved in Revision D silicon Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com ADAU1452 Silicon Anomaly NOTES 2 I C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). 2014 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. S11486-0-3/14(0) Rev. 0 Page 2 of 2