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Various AM3517 questions

Todd Solak
Intellectual 1415 points
Other Parts Discussed in Thread: AM3517, AM3505

Hello,

Can you please help me with the questison below?

Thanks,

Todd

NAND Question:  (In general, what is the largest size NAND flash the AM3517 can support?)

 

Can the AM3505/17 support any of the following NAND flash SLC memories:

4Gbit density, x16bit width

8Gbit density, x16bit width

16Gbit density, x16bit width

 

Our current design uses a 1Gbit, x16bit width SLC NAND device.  We want to expand this memory size if possible.

 

 

 

DRAM Question:  (In general, what is the largest size DDR2 memory the AM3517 can support?)

 

Can the AM3505/17 support 2 X DDR2 memories each with a 2Gbit (128Mbit x 16 bit width) density?

Our existing design uses 2 X 1Gbit (64Mbit x 16bit width) DDR2 memories for a total DDR2 memory of 256Mbytes.  We want to expand this memory size if possible.

 

 

Display Subsystem Follow-up Question:  (In general, we need LCD display support to get things up and running quickly, can your team help?)

 

We want to insure that the AM3517 can directly drive a large format LCD display without the need of converting from 24-bit parallel data to HDMI or DVI and then back to parallel data at the display.  The AM3517 processor and its circuit card will be positioned behind the LCD display in this design allowing us to directly connect to the display and therefore minimize or eliminate cost associated with converting the display signals to HDMI or DVI.  Is there someone on your team that can help with setting up the display registers in the AM3517 or at least confirm that a certain LCD display (to be picked soon) can be interfaced properly to the AM3517’s display sub-system?  We don’t want to get so far down a design path and find out that it can’t be done.

  • 0
    TI__Mastermind 28055 points

    Todd

    Can you give us any more details on the LCD? The 24-bit interface can handle large resolutions and a maximum pixel clock of ~74MHz.

      Paul

     

  • 0
    TI__Genius 9190 points

    Todd Solak said:

    NAND Question:  (In general, what is the largest size NAND flash the AM3517 can support?)

     

    Can the AM3505/17 support any of the following NAND flash SLC memories:

    4Gbit density, x16bit width

    8Gbit density, x16bit width

    16Gbit density, x16bit width

     

    Our current design uses a 1Gbit, x16bit width SLC NAND device.  We want to expand this memory size if possible.

    the GPMC on the AM35x supports up to 4k page size and 8b ECC.  Since NAND is not memory mapped the density is not bounded by the AM35x GPMC memory map. 

  • 0
    TI__Genius 9190 points

    Todd Solak said:

    DRAM Question:  (In general, what is the largest size DDR2 memory the AM3517 can support?)

     

    Can the AM3505/17 support 2 X DDR2 memories each with a 2Gbit (128Mbit x 16 bit width) density?

    Our existing design uses 2 X 1Gbit (64Mbit x 16bit width) DDR2 memories for a total DDR2 memory of 256Mbytes.  We want to expand this memory size if possible.

    the AM35x can support up to 2 loads on the Addr/Cmd lines so you should be ok with those devices, but you should check to make sure that thye are monolithic memories. 

  • 0 in reply to PaulM
    TI__Intellectual 1415 points

    Hi Paul,

    Yes, here are some additional comments and clarificaiton from Deibold regarding their LCD based questions:

     

    Let me help answer your question and put some perspective around what we are doing and why the answers to these questions are important.

     

    First, I am currently working in parallel with our display supplier on similar technical questions.  I have asked them for their suggestions on what LCD and touchscreen to use based on the following general specifications:

     

    1. LED backlit

    2.     LCD screen size ~20” diagonal.  Anywhere in the range of 17” – 24” would be acceptable

    3.     Capacitive touch screen overlay for the recommended LCD display in item #2

    4.     The touch screen interface can be either I2C, SPI or USB

     

    I also told their team exactly which processor we were using and provided them with a link to the AM3517 reference manual.  In particular, I directed their attention to the Display Subsystem Overview chapter which shows the AM3517 display controller’s capabilities.  They have come back with a few questions, but no suggestions yet.  I am relying on them to provide me an orderable LCD part number and datasheet.  When I have their suggestion(s), I will forward them to you immediately for review and validation that the AM3517 can drive that particular panel.

     

    Second, the memory questions are in direct relation to a new spin of the Pegasus board we built last year.  We are going to change the Bill of Materials to contain the AM3517 processor (rather than the AM3505 processor) and increase the NAND and DDR2 memories as much as possible.  Basically the answers to the memory questions will allow the updated BOM to be released to my board supplier to get more circuit cards built.  No pressure :-)

  • 0 in reply to Todd Solak
    TI__Mastermind 28055 points

    Todd

    I'll review the details when provided.

      Paul

  • 0 in reply to PaulM
    TI__Intellectual 1415 points

    Hi Paul,

     

    Just to confirm - please let me know if you need anything else from our customer in order to address their questions.

     

    Thanks!

    Todd