AM335x GPMC address error

caihong yao

when i configure gpmc cs1 with 8bit \nor flash like \ Address and data multiplexed attached device
when i write by following

but the addr is error the data is ok form the oscilloscope

i write addr is 0-1-2-3-4-8,but am335x ad0-ad7 is 0-0-1-1-2-4,can you tell me why

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Please post your GPMC_CONFIGx register settings.

0 caihong yao over 9 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

cs=cs1

GPMC_CONFIG1=0x200

GPMC_CONFIG2=0x101001

GPMC_CONFIG3=0x22060514

GPMC_CONFIG4=0x10057016

GPMC_CONFIG5=0x10f1111

GPMC_CONFIG6=0x8f070000

GPMC_CONFIG7=0xf41

GPMC_CONFIG1=0x200

GPMC_AD[7:0] for data and addr signal

0 Biser Gatchev-XID over 9 years ago in reply to caihong yao

TI__Guru**** 393215 points

Please post the GPMC part of your schematic. It seems to me that you have the addresses connected wrongly.

0 caihong yao over 9 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

i can not connected anything ,i only look the sigal of GPMC_AD[7:0] with oscilloscope

0 Biser Gatchev-XID over 9 years ago in reply to caihong yao

TI__Guru**** 393215 points

Please see section 7.1.2.3.10.1.1.4 from the AM335x TRM Rev. O:

"Address bits A[16:1] (GPMC point of view) are placed on the address/data bus at the start of cycle time, and the remaining address bits A[26:17] are placed on the address bus."

Can you try writing to even addresses only?

0 caihong yao over 9 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

and the A0 where it is

0 Biser Gatchev-XID over 9 years ago in reply to caihong yao

TI__Guru**** 393215 points

It's not output. See also Table 7-5 from the AM335x TRM Rev. O. This is the reason for which I asked you to try writing to even addresses.

0 caihong yao over 9 years ago in reply to Biser Gatchev-XID

Prodigy 60 points

Table 7-5 from the AM335x TRM Rev. O.,the example is Multiplexed Address Data 16-Bit Device,but havo no Multiplexed Address Data 8-Bit Device,i used 8-bit,so i can not used even addresses, now i only can used GPMC_AD[7-1] for addresses GPMC_AD[0] can only be used for data

0 caihong yao over 9 years ago in reply to caihong yao

Prodigy 60 points

so i can only used even addresses

0 Biser Gatchev-XID over 9 years ago in reply to caihong yao

TI__Guru**** 393215 points

Yes, A8...A1 are output on GPMC_AD[7-0].

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AM335x GPMC address error