Hi, Everyone
I have a question about GPMC of AM335x.
My customer setup these parameter.
GPMC_FCLK and GPMC_CLK ... 100MHz
CSONTIME ... 1 clock
OEONTIME ... 2 clock
OEOFFTIME ... 15 clock
CSRDOFFTIME ... 16 clock
We use Asynchronous Single Read Operation on Nonmultiplexed
I understand about OE in below.
No wait ... OEONTIME ～ OEOFFTIME = 130[ns]
Input wait ... OEONTIME ～ OEOFFTIME + wait time
In this case, We measure real waveform.
-Case1
wait time ... 50[ns]
OE time ... 150[ns]
-Case2
wait time ... 50[ns]
OE time ... 160[ns]
-Case3
wait time ... 75[ns]
OE time ... 170[ns]
-Case4
wait time ... 75[ns]
OE time ... 180[ns]
We do not understand why these These do not match vales.
It means we guess OE time is 205ns(200～210) in Case4.
Because 130ns + 75ns = 205ns.
Why these vales do not match ?
I have customer's program and waveform.
but I can not share in public forum.
Please give me mail if you need program.
My mail address is tazawa@fujiele.co.jp
Best Regards
Hiroyasu
