• AXI4 Bus Bandwidth/Data Transfer increase

    Hello,

    I am doing research with an Ultra-Embedded Implementation of a RISC-V Processor in gem5.  My team is using an Oracle Virtual Machine to run testbenches and benchmarks for our research motivation.  As part of our research, I have been tasked with…

  • AXI fixed burst to a slave with narrow data width

    Hi,

    I have an AXI master with data width 64, and an AHB slave of data width 32. What would happen when there is a 64bit FIXED burst READ (i.e., asize=3)to an address 0X100 of the slave? 

    Would the the data be read from 0x100 only, with data[63:32] always…

  • Aligned and unaligned word transfers on a 64-bit bus

    address = 0x07 

    transfer size = 32 bit

    burst type  = INC

    Burst length = 4 transfers

    Can you please explain this example of unaligned word transfer on 64-bit bus.

    Why the second transfer started at 8 and not from C?

  • what action will be performed by the master based on the read and write responce in axi 4?

    i read the specification of AXI 4 protocol. i want to know what action will be performed by the master when it receive okay,exokay,slverr or decerr. okay and exokay says that the transfer is completed either by normal access and by the exclusive access…

  • How does QoS with priority and ordering allowed with AXI ID?

    I have one question for QoS with AXI4:

    Can one master have multiple QoS values?

    Meaning one master issues requests with different QoS values but all with same AXI ID and the interconnect network arbitrates between these requests based on QoS value and…

  • ARM AXI4 protocol assertions trigger errm_wdata_num_prop5 and errm_wlast_stable quesitons

    Hi,

    I'm getting two AXI4 protocol assertion errors.

    For axi4_errm_wlast_stable, I can see why it's flagging an error but functionally it shouldn't be a problem.

    The WREADY =1 for one more cycle when though WVALID=0 and WLAST=0. 

    Is this a…

  • AXI modifiable read access

    The AXI protocol description states for modifiable transactions (ARCACHE[1] is asserted):

    "a read transaction can fetch more data than required"

    To me, this can be interpreted in two ways:

    1. The RVALID signal of the slave can be asserted for…

  • AXI4

    In the spec it is mentioned that AXI4 supports high-bandwidth, high-frequency and low-latency operation. How to justify this?  What is the meaning of bandwidth in this context? What are the  values of bandwidth and frequency? How they decide the operating…

  • Is during AXI unaligned transfer not all WDATA bits used?

    Dear Forum,

    Can you please confirm one thing.

    When we have un-aligned transfer, do some of WDATA bits not used during that transfer?

    For example, in the below unaligned transfer WDATA[7:0] are not used for the 1st transfer. Is my understanding right?

    …

  • When Wrapping happens in AXI?

    Hi Forum,

    I cannot understand when address is being wrapped in WRAP burst.In my example, the WRAP condition never happens in other words, during BURST operation address always remains small than wrap address.

    From the spec, the wrapping happens when

    …

  • AXI4 Burst Transactions

    I am new to AXI4 protocol. I would like to know how many clock cycles are required to complete a AXI4 burst write transaction.

    Eg. Burst length- Two , Burst size 16 bytes.

    Please give me answers for different types of data bus width say for bus width …

  • unaligned address in AXI protocol

    i am sending data "NEWDATAA"  which is 8 bytes. and  starting address is 5, which is unaligned address then whether my data is loss or not . please explain how the whole transfer will happens. how the strobe will works. is my data start with aligned…