tag: MBiST

DFT In Automotive
By Ed Sperling - 13 May, 2026 - Comments: 0

Ensuring automotive chips are reliable, defect-free, and secure adds a whole new dimension to design for testability (DFT). Depending on the safety criticality of a system in an automobile, tests can range from key-on, once a car is started, to safety-critical features that may need to be tested every couple hundred milliseconds during operation. Lee Harrison, director of automotive IC solution... » read more

HBM Shifts Testing Left To Preserve AI Chip Yield
By Anne Meixner - 12 May, 2026 - Comments: 1

Key Takeaways: A high-yield, known-good stack requires multiple test insertions. Known good stack testing poses challenges for power delivery and thermal management. The shift to HBM4 and HBM5 will increase the pressure for shift-left test flows. Taller high-bandwidth memory (HBM) stacks and tighter TSV pitch are impacting AI module yields. The solution is to push test furth... » read more

Machine Learning Based MBIST Area Estimation
By Cadence - 03 Jan, 2024 - Comments: 0

Majority of the silicon with-in a design is occupied by memories. Memories are more prone to failures than logic due to their density. Several techniques have been established to target and detect defects within these memory instances and their interfacing logic. The most widely used approach is memory built-in self-test (MBIST) that inserts on-chip hardware unit(s) which provides systematic me... » read more

Automation Of Shared Bus Memory Test With Tessent MemoryBIST
By Siemens EDA - 12 Apr, 2022 - Comments: 0

New requirements in automotive, artificial intelligence (AI), and processor applications have resulted in increased use of memory-heavy IP. Memory-heavy IPs for these applications are optimized for high performance, and they will often have a single access point for testing the memories. Tessent MemoryBIST provides an out-of-the-box solution for using this single access point, or shared bus int... » read more

Automate Memory Test Through A Shared Bus Interface
By Harshitha Kodali - 12 Apr, 2022 - Comments: 0

The use of memory-heavy IP in SoCs for automotive, artificial intelligence (AI), and processor applications is steadily increasing. However, these memory-heavy IP often have only a single access point for testing the memories. A shared bus architecture allows testing and repairing memories within IP cores through a single access point referred to as a shared bus interface. Within this interface... » read more

New Memories Add New Faults
By Bryon Moyer - 07 Sep, 2021 - Comments: 1

New non-volatile memories (NVM) bring new opportunities for changing how we use memory in systems-on-chip (SoCs), but they also add new challenges for making sure they will work as expected. These new memory types – primarily MRAM and ReRAM – rely on unique physical phenomena for storing data. That means that new test sequences and fault models may be needed before they can be released t... » read more

Convolutional Compaction-Based MRAM Fault Diagnosis
By Technical Paper Link - 03 Sep, 2021 - Comments: 0

Abstract: "Spin-transfer torque magnetoresistive random-access memories (STT-MRAMs) are gradually superseding conventional SRAMs as last-level cache in System-on-Chip designs. Their manufacturing process includes trimming a reference resistance in STT-MRAM modules to reliably determine the logic values of 0 and 1 during read operations. Typically, an on-chip trimming routine consists of mult... » read more

MBIST-supported Trim Adjustment to Compensate Thermal Behavior of MRAM
By Technical Paper Link - 03 Sep, 2021 - Comments: 0

Abstract: "Spin Transfer Torque Magnetic Random Access Memory (STT-MRAM) is one of the most promising candidates to replace conventional embedded memory such as Static RAM and Dynamic RAM. However, due to the small on/off ratio of MRAM cells, process variations may reduce the operating margin of a chip. Reference trimming was suggested as one of the ways to reduce variation impact to the chi... » read more

Is There a Practical Test For Rowhammer Vulnerability?
By Bryon Moyer - 08 Jun, 2021 - Comments: 3

Rowhammer is proving to be a difficult DRAM issue to fix. While efforts continue to mitigate or eliminate the effect, no solid solution has yet made it to volume production. In addition, more aggressive process nodes are expected to exacerbate the problem. In the absence of a fix, then, testing may be one way to give DRAM manufacturers and users some way to segregate devices that are more su... » read more

Preventing Chips From Burning Up During Test
By Bryon Moyer - 09 Mar, 2021 - Comments: 1

It’s become increasingly difficult to manage the heat generated during IC test. Absent the proper mitigations, it’s easy to generate so much heat that probe cards and chips literally can burn up. As a result, implementing temperature-management techniques is becoming a critical part of IC testing. “We talk about systems, saying the system is good,” said Arun Krishnamoorthy, senior... » read more

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