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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


    TCMs are connected directly to the processor, not through the bus.  So you don't have bus arbitration or the overhead of the bus protocol when you speak to them.


    thank you.
    But how about the IRAM? is it connected on the System bus or directly to the processor? if it is on the System bus, how is different from the SRAM or other flash memory connected on the system bus?
    If the TCMs are connected to processor, do they still use the addresses which fall within the 2 pow 32 range?
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  • 0
    Note: This was originally posted on 2nd April 2012 at http://forums.arm.com


    TCMs are connected directly to the processor, not through the bus.  So you don't have bus arbitration or the overhead of the bus protocol when you speak to them.


    thank you.
    But how about the IRAM? is it connected on the System bus or directly to the processor? if it is on the System bus, how is different from the SRAM or other flash memory connected on the system bus?
    If the TCMs are connected to processor, do they still use the addresses which fall within the 2 pow 32 range?
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