Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

DMA Transfer Issue

Hi, I have build a system which has NIOS II, DDR SDRAM controller, On-Chip RAM, UART,DMA Controller. My program memory is DDR SDRAM. I have connected DMA controller between DDR SDRAM and On-Chi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

If your sdram has an adress range from 00000000h to 01FFFFFFh and your clock crossing bridge starts at 02000000h assuming only the sdram is behind that bridge, then it is correct that this bridge has an adress range from 02000000h to 03FFFFFFh as you just have to add both adress values.

your problem is that you write to 00100000 but there is no sdram, as you must take the bridge into account, you have no memory between 00000000h to 01FFFFFFh

i bet it will work if you change 00100000 to 02100000