Forum Discussion

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

Remote Update with NIOS and EPCS

Hello, Currenty I'm working on a Cyclone III to try Remote Update work. I've searched for a lot of information but couldn't find specifiek how to work. I'm trying to work with the altremote_up...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

I think the following line: 

IOWR( REMOTE_UPDATE_CONTROLLER_BASE, 0x4, hw_flash_offset >> 3)

Should be: 

IOWR( REMOTE_UPDATE_CONTROLLER_BASE, 0x4, hw_flash_offset >> 2)

I seem to recall having the same problem as I think one of the Altera app notes uses shift by 3 for some reason. However, when I monitored the SPI lines on a scope I could see the address being read from the memory was off by 1 bit. When I changed it to shift by 2, it started to work.

According to the Cyclone III handbook, the address register is the most significant 22 bits of the 24 bit boot address, so a shift by 2 does make sense.