Limitations of STA Timing Design STA by VLSI Universe - July 11, 2021July 20, 20210 Static timing analysis helps to find timing issues in almost all aspects of a design and is very important to have a VLSI chip with no timing problems. But there are still some cases where STA timing verification cannot be completely applied and verified. Let us discuss some of such difficulties or limitations of STA in the below article. You can read these STA (Setup time and Hold time) and STA-related problems with solutions articles to understand static timing analysis first. Calculating maximum operating frequency and checking for setup and hold time violations are described in detail. STA during Reset Sequence When there is an asynchronous or synchronous reset, we need to check whether all the flip-flops got reset. The flops must reset into
STA Solved Problems VLSI Interview 2021 Interview Questions STA by VLSI Universe - June 20, 2021July 21, 20210 Static Timing Analysis Basics Static timing analysis (STA) based questions asked in the written test of a digital interview. STA Problems to calculate setup time and hold time and maximum operating or clock frequency or minimum Time Period required. Before starting to read this article try to understand the basics of static timing analysis (STA) such as, 1. What is Static Timing Analysis (STA)? 2. Why Static Timing Analysis (STA)? 3. Where we use STA Static Timing Analysis? 4. What is setup time and how to avoid setup time violations? 5. What is hold time and how to avoid hold time violations? 6. How to calculate the maximum clock frequency fmax or minimum time period Tmin required for the given sequential circuit. Setup time (Tsetup_time) Well Setup time in STA
Lockup Latches in Testing to fix Hold Failure and Clock Skew STA by VLSI Universe - May 23, 2021July 21, 20210 In the DFT timing analysis, scan chain design of any SOC or an IC VLSI Chip, lockup latches, and lockup registers play a very important role. Especially these are used in fixing hold timing closure as well as to avoid timing clock skew difficulties. Let us understand these from the timing perspective and their significance in congestion. And we will discuss the difference between both lockup registers and lockup latches. Introduction In the current generation of VLSI technology, SOC’s are made of multi-clock domains with various functional sources. To avoid a large, uncommon path between the clocks of two flip flops from the timing perspective these latches can be the best solution. But the disadvantage of these lockup latches is that they can cause
Synchronizers and Metastability in Digital Logic Circuits CMOS Interview Questions by VLSI Universe - May 5, 2020July 21, 20210 The circuits which accept the input that can change at arbitrary times and produces output with a nonzero probability of Metastability are Synchronizers. The sequential logic elements are mainly characterized by the setup and hold times. If the input data changes before the setup time the output reflects a different new value after a bounded delay. If the input data changes after the hold time the output reflects a different old value after a bounded delay. and If the input data changes between the setup and hold time constraint or aperture then the output may be unpredictable and irrelevant. That is the output may go to a metastable state. Now let us analyze how a Latch will respond to a voltage that will change
STA-Static Timing Analysis-Setup and Hold 2021 STA by VLSI Universe - April 24, 2020July 21, 20210 The timing performance of the VLSI or ASICs is checked by either STA Static Timing Analysis or DTA Dynamin Timing Analysis. STA is a technique or method of breaking the circuit into different paths and computing their delay and based on the delayed outcome it validates and verifies the design. let us look into the same. Also read which were asked in VLSI interviews STA Solved Problems Introduction The main headache of any digital or VLSI design engineer is the timing while designing a CMOS semiconductor chip. How to model it and how to verify the timing. The design team may take a huge amount of time may be spending some months in modifying and making trials to achieve or to meet the required
