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TMS320C6746: Does SHRAM @ 0x80000000 exist on C6746?

Patrick Davies
Prodigy 40 points
Part Number: TMS320C6746

Hi guys. We first started prototyping with a c6748 LCDK development board. Version 2 has a c6746 since we didn't need all the features. I noticed that the datasheet for the c6746 doesn't state that there is SHRAM @ 0x80000000 like it does in the c6748 datasheet's memory map. Is this an oversight? and if not then why does a program I locate there on a c6746 run fine?

I would like to know if we are able to rightfully use that memory space on a c6746.  

Notes:

c6746 Datasheet pg 21 : (www.ti.com/.../tms320c6746.pdf)

  • 0
    TI__Guru* 78475 points

    Hi Patrick 

    I wanted to correct our previously posted response - the c6746 does NOT "support" the SHARED RAM  of 128K unlike c6748. 

    The various device part # within the c6748 family i.e. c6748 , c6746 and c6742 support slightly different performance, peripheral and feature set - the data sheet clearly outlines those. The differences are in sync with the cost at which these devices are offered and may translate to internal test time reduction to offer devices at lower cost. 

    So please adhere to the datasheet spec for your production application - and if you are buying c6746 you should not use that ram space even if it is useable, as TI takes no guarantee of that RAM's working for c6746. 

    Some of our newer datasheets come with a further clearer warning like below

    Features noted as “not supported,” must not be used. Their functionality is not supported by TI for this family of devices. These features are subject to removal without notice on future device revisions. Any information regarding the unsupported features has been retained in the documentation solely for the purpose of clarifying signal names or for consistency with previous feature descriptions.

  • 0 in reply to Mukul Bhatnagar
    Prodigy 40 points

    Got it Mukul. Thanks for the clarification. I thought that was the case, but since some online documentation refers to this memory area when speaking of "c6000" devices in general I thought maybe this memory is include across all product lines.

    Much appreciated,