Preparing for a job interview can be a daunting task but having a few answers prepared can make a huge difference. Knowing the right questions to ask and the best answers to provide is key to having a successful interview. The AHB interview questions can make the difference between winning the job or being overlooked.
In this blog post, we will discuss some of the most common AHB interview questions and provide advice on how to answer them. We will also provide some tips on how to prepare for an interview and how to make the most of your time with the interviewer. With this information, you will be well prepared for the upcoming AHB interview and have a much better chance of getting the job.
- How AHB is pipelined architecture?
- What is the size of the max data that can be transferred in a single transfer?
- Explain the 1k boundary concept in AHB?
- Okay, response is a single cycle? …
- Explain the concept of a two-cycle response?
- What if the slave gets the address out of range?
AHB DEMO SESSION
Every transfer’s address phase begins with the arbiter sampling the master’s HLOCK signal, which is about to begin driving the address bus. If HLOCK is asserted at this time, the arbiter will then assert HMASTLOCK for the duration of the transfer’s address phase. 6. A master must maintain its HBUSREQ signal asserted throughout an undefined length burst (INCR) until it has begun the address phase of the last transfer in the burst. This means that at the end of an undefined length burst, the master may be given the bus for an additional transfer if the penultimate transfer in the burst is in a zero wait state. Once the master has been given the bus for the first transfer, the master can deassert the HBUSREQ signal for a burst of a specified length. This is possible because the arbiter can keep track of the transfers in the burst and maintain the granted master until the burst is finished. The master will have to re-assert HBUSREQ if the Arbiter removes HGRANT before the burst has finished because it is not a requirement for an Arbiter to let a burst complete. 7. The arbiter will always grant the master an additional transfer at the conclusion of a locked sequence, ensuring that the master will perform one transfer with the HMASTLOCK signal low at the conclusion of the locked sequence. This is when the final transfer in the locked sequence is in the data phase. However, if the data phase of the most recent locked transfer receives either a SPLIT or RETRY response, the arbitrator will drive the HGRANT signals to ensure that either the master performing the locked sequence remains granted on the bus for a RETRY response or the Dummy master is granted the bus for the SPLIT response. 8. The AHB specification requires that all address phase timed control signals (other than HADDR and HTRANS) remain constant throughout a burst and does not allow a master to deassert HLOCK. HLOCK does not have address phase timing, but it does directly control the address phase timing HMASTLOCK signal. HLOCK must therefore stay high throughout a burst and can only be deasserted so that the next HMASTLOCK signal changes following the burst’s final address phase. 9. How many cycles must pass after a master asserts HBUSREQ before initiating a non-IDLEtransfer if the bus is currently granted to it by default? It can start a non IDLE transfer immediately. 10. When the bus was granted to it but not requested by the master, can it perform transfers besides IDLE? Yes. When a master has not requested the bus, it can make transfers besides IDLE. Please take note that in this situation, it is still advised that the master asserts its request signal to prevent the arbiter from giving the bus ownership to a lower priority master while the transfers are taking place.
AMBA AHB – Arbitration Questions1. The HLOCK signal must be asserted at least one cycle prior to the beginning of the address phase of a locked transfer, and it must be deasserted at the end of the address phase. In order for the arbiter to sample the HLOCK signal as high at the beginning of the address phase, this is necessary. When the address phase of the final transfer in the locked sequence has begun, the master should deassert the HLOCK signal. 2. A SPLIT, RETRY, or ERROR response from a slave can always cause a burst to be terminated early; can an arbiter be designed to always allow bursts to complete? Since the Arbiter has no control over this, it must be accepted. There is no effective way for an Arbiter design to allow the burst to finish before awarding another master for INCR bursts of undetermined length because their end point cannot be predicted. Cycle by cycle arbitration for INCR bursts is required. INCRx and WRAPx bursts of a specified length may have their beats counted and thus be permitted to end by the Arbiter. However, due to the synchronous timing of the AHB arbitration, there is no way to completely prevent the possibility of terminating a burst after the first transfer has been indicated. By sampling the HBURST bus, the Arbiter is the only one who is aware that a defined length burst is occurring. The first time HBURST can be sampled, however, is after the first burst beat’s clock cycle, at which point the arbitrator may have already chosen to grant another master and changed the HGRANT outputs accordingly. The AHB bus does not permit combinatorial paths, so only a combinatorial path from HBURST to HGRANT would enable the burst to be detected in time to avoid early termination in this scenario. ask ARM3. The address bus, HADDR, is sometimes depicted as an input to the arbiter for a reason. Although it is not necessary, in some system designs it may be useful to use the address bus to determine a good point to switch between bus masters. For instance, when a burst of transfers reaches a quad word boundary, the arbiter could be programmed to change bus ownership. 4. The HGRANT signal is capable of changing at any cycle, and the following scenarios are possible: * The HGRANT signal might be asserted and then removed before the current transfer is finished. This is acceptable because masters only sample the HGRANT signal when HREADY is high. * The bus may be given to a master without their request. * The aforementioned fact also indicates that the bus may be granted in the same cycle as it is requested. If the master is unintentionally granted the bus during the same cycle that it requests it, this may happen. 5. What connection exists between the HLOCK and HMASTLOCK signals?
If you are an engineering graduate with strong technical skills and are interested in working in a variety of settings, visit www. wisdomjobs. com. The connection and management of functional blocks in system on chip (SoC) designs is specified by the open standard, AMBA AHB Advanced Microcontroller Bus Architecture. It enables the creation of multiprocessor designs that incorporate numerous controllers and peripherals. Transfer can begin with the bus master by asserting a request signal to the arbiter in AHB, which is a component of AMBA. The arbitrator will then decide whether to allow the master to use the bus. The transfer is initiated by a granted Master bus using an address and control signal. Examine the provided AMBA AHB job interview questions and answers to chart your future as a Soc Verification Engineer, Digital Verification Engineer, Senior Silicon Engineer, Lead IP Engineer, and others.
In contrast, a RETRY response best instructs the Arbiter to give priority to higher priority masters. A SPLIT response instructs the Arbiter to give precedence to all other masters until the SPLIT transfer may be completed (correctly ignoring any additional requests from this master until the SPLIT slave indicates it can complete the SPLIT switch).
The specification specifies that the bus signals should be at legal levels during reset. This effectively implies that the signals should be wise 0 or 1, but no longer Hi-Z. The fashion designer is in charge of pushing the actual good judgment tiers. The most efficient reset sign is HTRANS, with an IDLE price as a minimum.
Yes. A master can perform transfers other than IDLE if the bus has not been requested. Please take note that even in this case, it is still advised that the master assert its request sign to prevent the arbiter from giving the bus to a lower priority master while the transfers are still taking place.
ALREADY must be prominent at some point during reset. This could ensure that is the case if all slaves in the machine drive HARDY excessively at some point in reset. However, it must be ensured that a slave who still pressures HREADY high is selected at reset if slaves are used that do not do so.
Slaves that need a lot of cycles to complete a transfer use both the Split and Retry responses. These responses permit a facts phase transfer to appear complete in order to prevent the bus from stalling, but they also recommend that the switch be attempted again when the master is next given the bus.
UVM Tutorial SystemVerilog Quiz AHB Interview Questions SystemC Quiz Interview Questions 1 HOME SYSTEMVERILOG Search UVM SYSTEMC ASIC SLIDES Tutorials SystemVerilog Tutorial SystemC Tutorial AMBA AHB AXI Interview Questions How AHB is pipelined architecture? 2. How much data can be sent in a single transfer? SystemVerilog Interview Questions 3. Explain 1k boundary concept in AHB? UVM Interview Questions 4. Okay, so the response cycle is one, but the error, split, and retry cycles are two. ASIC Verification Interview Question 6: What is the definition of a two cycle response? SOC Verification Interview Questions 7 What if the slave receives the address outside of range? AMBA AHB AXI Interview Questions 8: How do I connect multiple slaves to a single master? How would you describe the round robin arbitration concept? Explain the splitretry concept? 10. What is the difference between HREADY and HREADY_OUT signals? 11. What is the slave response for BUSY transfer? 12. What is the difference between WRAP4 and INCR4? 13. How to terminate the INCR type transfer? 14. What is difference between BURST and Beat? 15. How to calculate the size of the burst? 16. Is HREADY is Input or output to/from the slave? 17. What is align and unalign concept? 18. Explain wrapping calculation? 19. Is early burst termination is done by Slave/Arbiter? 20. Explain the LOCKED transfer? 21. What is default Master? 22. What is littleendian and bigendian? 23. How will the slave recognize when an INCR-type burst transfer has ended? AXI Interview Question 1 How AXI is different from AHB? 2. Explain the concept of AXI 4KB boundary condition? 3. Explain the valid ready handshake in AXI? 4. Explain the channel concept? 5. Explain the outoforder concept? 6. What is fixed burst type? 7. What are the different AXI response types? Google this: Copyright 2016 Verification Guide All rights reserved. Your valuable inputs are required to improve the quality. Follow Us.
FAQ
How many slaves can be connected to AHB?
A pipelined system backbone bus called the AHB is intended for high-performance use. Up to 16 bus masters and slaves that can delay or retry transfers are supported. There are masters, slaves, an arbitrator, and an address decoder in it. It supports burst and split transfers.
How do I verify AHB protocol?
By completing successful read and write operations for the incrementing burst feature, the AMBA protocol (AHB) is proven. The Mentor Graphics tool Questa sim- simulator simulates the AHB verification environment. Keyword : – AMBA ,AHB , SV, SVA . consumption.
What is AHB bus protocol?
Advanced Microcontroller Bus Architecture version 2 by ARM Ltd company introduced the bus protocol known as the Advanced High-performance Bus (AHB). It has the following features in addition to the previous release: large bus-widths (64/128/256/512/1024 bit).
What are the major blocks of AHB bus?
The AHB design includes fundamental building blocks like master and slave, and these building blocks operate according to an arbitration scheme. Only one master may access the bus at once, per the arbitration scheme.
