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ITCM, DTCM and IRAM access

Mallikarjun Shivappa Bidari
Note: This was originally posted on 28th March 2012 at http://forums.arm.com

Hi,

The ITCM and DTCM are used to improve the performance or the access speed (Low latency memory and Unpredictibility of the caches).
Similarly the IRAM also provides the improved speed.
If the system has both IRAM and TCM, then how does the IRAM and TCM access differ (Where does IRAM and TCM connected, is it on system bus)?


Regards,
Malli
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    Note: This was originally posted on 2nd April 2012 at http://forums.arm.com

    Ahh ok, that makes sense.

    So TCMs are memories connected directly to the processor.  They also typically (but not always) fast - that is the same or near processor frequency,

    IRAMs in your case are just means on SoC memory.  It'll still be connected through the bus.  In terms of speed, typically much quicker than the bulk off-chip memories.  But probably still lower frequency than the processor itself.  As the bus usually runs at a lower frequency than the processor.

    IRAM vs TCM
    The main difference between them then is how the connect to the processor.  TCMs directly to the processor, and IRAMs through the bus interface.  What benefit this gives is system specific.  Typically its going to be that with TCMs there can be contention with other masters.
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  • 0
    Note: This was originally posted on 2nd April 2012 at http://forums.arm.com

    Ahh ok, that makes sense.

    So TCMs are memories connected directly to the processor.  They also typically (but not always) fast - that is the same or near processor frequency,

    IRAMs in your case are just means on SoC memory.  It'll still be connected through the bus.  In terms of speed, typically much quicker than the bulk off-chip memories.  But probably still lower frequency than the processor itself.  As the bus usually runs at a lower frequency than the processor.

    IRAM vs TCM
    The main difference between them then is how the connect to the processor.  TCMs directly to the processor, and IRAMs through the bus interface.  What benefit this gives is system specific.  Typically its going to be that with TCMs there can be contention with other masters.
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