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RM48L940: Flash ROM and LCD Interface

Abhijit Pethkar41
Intellectual 280 points
Part Number: RM48L940

We have planned to use RM48L940 Hercules Processor in our design. As per the datasheet it is given that "The External Memory Interface (EMIF) provides off-chip expansion capability with the ability to interface to synchronous DRAM (SDRAM) devices, asynchronous memories, peripherals, or FPGA devices."

  1. What is meant by asynchronous memories?
  2. Does EMIF include Flash ROM also or asynchronous RAM only?
  3. Can EMIF support LCD interface?
  4. Is there any design where you have used Flash ROM or LCD interfaced with RM48L940 Hercules Processor?

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Regards

Abhijit Pethkar

abhi@peth
  • 0
    TI__Guru**** 193286 points

    Hello,

    1. The synchronous memory uses the EMIF CLK to coordinate the memory access, but the asynchronous memory does not use the EMIF CLK. 

    2. Yes, EMIF supports async SRAM, NOR Flash, NAND flash, etc.

    3. The EMIF can be used to interface some kind of LCD. 

    4. I am sorry I don't have example for EMIF + LCD. If you use EMIF to interface with NOR Flash, we can help.

  • 0 in reply to QJ Wang
    Intellectual 280 points

    Hello,

    We are now interfacing NOR flash (MT28EW01GABA1LJS) with the Microcontroller (RM48L940). From the datasheet I came to know that each of the chip selects (CS2, CS3 and CS4) can support up to only 16MB of asynchronous memory (NOR flash in our case).

    Can I access about 1Gbit of NOR flash memory with this Processor?

  • 0 in reply to Abhijit Pethkar41
    TI__Guru**** 193286 points

    Hello,

    As you knew that actual memory size supported by each CS is 16MB. 1Gbit or 128GB is not supported.