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DM385 Booting from NAND flash with 8 bit address

Other Parts Discussed in Thread: DM385

I will be using the MT29F2G08ABAGAH4-IT:G which is 256MB NAND flash with 8-bit address bus. I will also be booting from NAND flash. The DM385 has an 8-bit (GPMC_A[16 – 23]) and a 16-bit (GPMC_D[0 – 15]) address bus and the 16-bit bus has the boot mode pins on it. Here are my questions:

 

1.)    Since I have an 8-bit address part do I need to use the 8-bit address on the DM385?

2.)    Since I will be booting from NAND do I have to have my NAND flash connected to the BTMODE pins?

3.)    If I have to use the BTMODE pins can I just use half of the bus for my part?

  • Hi Brian,

    1. May be you confuse address bus with data bus. The MT29F2G08ABAGAH4-IT:G is x8, which means 8-bit data bus. When NAND chip is attached to the DM385 GPMC, the address lines of the GPMC are not used. x8 is I/O[7:0], Data inputs/outputs. For more info, refer to the DM38x TRM, chapter 11 GPMC, Table 11-2. GPMC Pin Multiplexing Options and Figure 11-4. GPMC to 8-Bit NAND Device

    2. Refer to DM38x TRM, section 4.7.3.5 Sysboot Pins for NAND Boot.

    3. I do not understand your question here. Can you provide more details? Which half of which bus of which part?

    Regards,
    Pavel
  • Hello Pavel,

    I apparently needed more sleep yesterday! HA HA. You have answered my question perfectly. 

    Thank You,