problem using SSI1 port on Cirrus logics EP7312.

From: Andras Tantos (andras_tantos_at_yahoo.com)
Date: 06/30/04

  • Next message: Ed Beroset: "Re: Few questions on embedded stuff" 
    Date: Tue, 29 Jun 2004 16:20:39 -0700

    Hi!

    One of my friends asked me to try to collect some intelligence on this
    phenomenon: he tries to interface an SPI real-time-clock IC (Rx5C348
    http://www.ricoh.com/LSI/product_rtc/4wire/5c348/) to a Maverick EP7312 CPU
    using its SSI1 port. The communication works OK except for the fact that
    data gets shifted one bit both on reception and transmission. This means
    that the LSB cannot be set or retrieved from any of the registers of the
    clock IC. He examined the communication with a logic analyzer and says that
    the wires already contain the shifted data and that the CPU 'swallows' the
    first bits of the communication.

    Does anyone have any experience in this field? What could be the problem? 

    --
Thanks,
Regards,
Andras Tantos
http://andrast.tantos.homedns.org
  • Next message: Ed Beroset: "Re: Few questions on embedded stuff"

    Relevant Pages

    • Re: Question on interpreting nmon
      ... The number of active cpu processes is way too high for this system. ... If you have received this communication in error, ... confidential and privileged information for the use of the designated recipients ...
      (AIX-L)
    • Re: Scheduler fairness problem on 2.6 series
      ... I am working on a load balancing class using mpi. ... |> tested) cluster overhead is just as low as 3% to 5%, ... Or that the cpu is ... just for making it clear and final communication:) ...
      (Linux-Kernel)
    • Re: Threading / Processes / Dual CPUs - questions
      ... See interprocess communication. ... > For dual CPU system, can I force a new process to start in the second CPU ... > Hyperthreading is activated or does simply starting a new thread in my ... Would I need to use remoting? ...
      (microsoft.public.dotnet.languages.vb)
    • Re: [fw-wiz] PIX 535: High CPU, High-Latency
      ... CPU utilization on this platform? ... possible risks associated with such communication. ... firewall-wizards mailing list ...
      (Firewall-Wizards)
    • Re: cpu speed of Winterhawk node
      ... = Unique CPU ID ... cpu speed of Winterhawk node ... This Email communication and any attachments may ... contain confidential and privileged information for the use of the ...
      (AIX-L)