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Connecting ~12 16bit wide memory ICs to the TMS570LS3137

Alan Day
Intellectual 920 points
Other Parts Discussed in Thread: TMS570LS3137

Hi,

For a project I need to connect many memory devices to the same TMS570LS3137, they are all similar and can work with the settings of a single nCS.

As far as I can see there is no reason why I cannot use a simple GIO to control the CE of all the memory ICs, the only draw back would be in that the code will run slower and hence a slower data throughput.

Have I over looked anything or is there something in the working of the TMS570 which will cause this idea not to work.

Cheers,

Alan

 

  • 0
    TI__Guru 59540 points

    Hello Allan,

    I believe your concept should work. However, you will need to also utilize the chip selects provided by the EMIF with the external memory devices. The TRM outlines the use of these chip selects for both synchronous and asynchronous memories.

    A second consideration that you will need to take into consideration is the loading that will be applied to the pins by the external devices. This may impact our signal rise/fall times requiring the need to run the EMIF at a slower clock rate than specified in the datasheet. Given the slower speeds, you may need to also add external buffers to buffer the data.

  • 0 in reply to Chuck Davenport
    Intellectual 920 points

    Hi Chuck,

    Thanks for the quick response!  I'm not sure what you mean about the chip selects, as long as the memories pins are toggled as specified in their datasheet I don't really see a problem. 

    As for the loads I'm using a bus transceiver which will be able to handle it.

    Cheers,

    Alan

  • 0 in reply to Alan Day
    TI__Guru 59540 points

    Hi Allan,

    As you have pointed out, the CS pins may or may not be needed dependent on the specific memory device you are interfacing with. Let us know if there are any additional questions or concerns.

  • 0 in reply to Chuck Davenport
    TI__Guru 59540 points

    Alan,

    One additional item, if your question is answered, could you please verify the answer? This will allow the thread to be closed. If additional questions come up, then you would open a new thread.