Starterware/AM3359: ICEv2 NOR access

agreenough

Part Number: AM3359

Tool/software: Starterware

Hi there,

I am using NOR flash and seem to be having issues reading and writing to all of the memory sectors (M29W160EB) independently.

If I write data to address 0x08010000, when reading back, the data also appears in every other sectors. E.g. 0x08010000 = 0x08030000 = 0x08050000.

Equally if I read or write to address 0x08020000, the values are mirrored at addresses 0x08040000 and 0x08060000.

It would seem that the upper address lines are not working, I have verified the pin Mux configuration and all looks correct. Is there additional GPMC configuration that is needed for the following 4 address lines A16 – A19 on the flash device to work?

to note, the NOR flash is configured for Asynchronous AD-multiplexed 16-bit operation.

Many thanks,
Adam

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

If you look at the ICEv2 schematics (processors.wiki.ti.com/.../AM335x_Industrial_Communications_Engine_Board_Design_Files ) you will see that the high NOR address lines A16 to A19 are controlled by GPIOs.

0 agreenough over 8 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

A16 and A17 have been connected to GPMC_A8 and A9 (U5 and R5).
Address A18 and A19 are listed GPIO_2_12 and GPIO_2_13 which have been connected to GPMC_A6 and A7 (T3 and T4).

does the above seem correct?

0 Biser Gatchev-XID over 8 years ago in reply to agreenough

TI__Guru**** 393215 points

True enough, but GPMC addressing doesn't work this way. See Table 7-5 from the AM335x TRM Rev. P. A16...A19 must be connected to GPMC_A[1]...GPMC_A[4] to achieve a linear address space.

0 agreenough over 8 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

Thank you for the information.

from this I now have A16 and A17 working (configured as gpmc_a1 and gpmc_a2).

To note the schematic does not show this as an option so this is why I thought it was gpmc_a8 and gpmc_a9. This may be worth an update to be inline with the datasheet and TRM.

I am not able to configure A18 and A19 as gpmc_a3 and gpmc_a4 as the datasheet only details configuration for gpmc_a6/a12 and gpmc_a7,a13. Are you able to tell me what the mode should be for the 2 address lines? If mode 7 (gpio2_12/13) is there any additional configuration needed to get the lines working?

many thanks,
Adam

0 Biser Gatchev-XID over 8 years ago in reply to agreenough

TI__Guru**** 393215 points

Yes, A18 and A19 are GPIOs, and they can only be toggled through software.

0 agreenough over 8 years ago in reply to Biser Gatchev-XID

Prodigy 40 points

so are you saying that I would need to toggle A18 and A19 manually (in my code), or this this controlled automatically through the GPMC?

0 Biser Gatchev-XID over 8 years ago in reply to agreenough

TI__Guru**** 393215 points

No, it's not controlled automatically. This needs to be implemented in your code.

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Starterware/AM3359: ICEv2 NOR access