• [APB] Assert timing of PSTRB and PPROT

    Hi All,

    I have a question about assert timing of PSTRB and PPROT.

    I think APB4 spec (IHI0024C_amba_apb_protocol_spec.pdf) does not describe when PSTRB and PPROT should be asserted.
    I guess these signals should be asserted while PSEL is high like PADDR…

  • AMBA APB

    1)the APB uses massive memory-I/O accesses.what is that massive memory-I/O accesses?

  • AMBA APB

    1)what is the difference between with wait state and with no wait state(read/write)?what are the advantages of both in APB?

  • questions about APB advantages

    Note: This was originally posted on 8th November 2008 at http://forums.arm.com

    Hi! dear all  :lol:
    Some APB advantages are listed in AMBA 2.0 spec. They are

    "¢ performance is improved at high-frequency operation
    "¢ performance is independent of…

  • ARM Cortex ICode, DCode, System buses

    Note: This was originally posted on 26th February 2009 at http://forums.arm.com

    I'm a bit confused about the bus structure and memory model of ARM Cortex M3. First of all, does Cortex M3 actually have 3 physically separate buses coming out of it?
    …

  • How is the PREADY signal triggered low by the Slave in an APB?

    Hi, 

    I was trying to understand the state machine of an APB. I was curious on how the PREADY signal is triggered low so that it can exit from  the ACCESS state? 

    If anyone could help me with this basic question, it'll be of great help thank you. :)…

  • AMBA

    How is it possible for AMBA bus protocol to communicate between ASB bus and APB bus,if they operate in different frequency's? ASB is high performance high frequency bus and APB is low performance low frequency bus..how that communication is happening…

  • APB3 Slave responding when PSEL = 0

    Hello All,

    Here at IP Level verification we have no issues as the Master APB does not latch the PREADY, but at SOC Level with multiple APB Slaves 

    The Master performs some transaction with APB SLAVE 1 and before switching to APB SLAVE 2 , it disables the…

  • Assertion for Multiple Transfer on APB Bus

    Hi,

       Can you please help me in writing assertions to take care on multiple transfer in APB bus?

    Thanks,

    Rakesh

  • How can I get IP-XACT descriptions of CMSDK components?

    We use IP-XACT based automation tools, mainly for register views, so need IP-XACT description of the APB registers for the CMSDK components.

  • Can PENABLE be removed from APB as it seems redundant at IO level and same logic can be taken care of internally by Master and Slave ?

    PENABLE indicates the second and subsequent cycles of an APB transfer till PREADY goes HIGH.

    APB transfer can be considered as complete when PSEL==1 and PREADY==1 ignoring PENABLE==1 and PREADY==1 should be considered only after second and subsequent cycles…

  • AXI AHB APB quick reference cheat sheet

    Hi,

     I have tried to find a quick reference for AXI, AHB & APB to no avail, and after having to flit between the various documents and tables, I eventually created my own.

    So not sure of the legal ramifications of posting this elsewhere and whether…

  • apb 2.0 continuous transfer

    Hi All,

          Now i am focusing on the apb 2.0 specification. 

         How to perform a continuous transfer in apb 2.0 . I read some forum , But i did't get a idea.

          If anyone know the continuous transfer in apb 2.0 ,Please share the waveform . It;s easily…

  • apb protocol checker (assertions)

    How can I get apb protocol assertions on arm official site? Thanks in advance, KMK

  • why PSTRB signal in APB4 have four bits?

    PSTRB signal indicates which byte lanes to update during a write transfer.

    it shows that the bus contain valid data, when PSTRB[3:0]=1111.

    why we need bus instead of single bit PSTRB signal?

  • Why does AHB or APB support only 16 slave devices?

    I would like to know why only 16 slave device select lines are present in the AHB and APB bus architectures.

  • Please send the APB 3.0 spec

    Can you please send me the AMBA APB 3.0 specification for reference.

  • needs some clarification

    Hi

    i have one doubt..in apb protocols...what is the difference between wait_state and no_wait_state in apb protocopls?

  • Working frequency on AMBA- APB,AHB, AXI

    Hii,

    Greetings !!

    I would like to know the standard operating clock frequency and data rate of AMBA- apb, ahb, axi.

    Please someone help me out.

    Thanks in advance

    Regards

    Ujjwal