Forum Discussion

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

Multiprocessors on DE2

Hi, I am trying to implement two NIOS II processors on the DE2 Board. My question: Is it possible to program both CPUs using one JTAG-UART via USB-Blaster. I tried this with an AVALON-...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Thanks for your answer.

Now I have two JTAG-UARTs in my SOPC-project, which I attached, but I get this warnings:

Warning: currently assigned JTAG instance ID 0 for cpu_1/jtag_debug_module is shared by cpu_2/jtag_debug_module. Reassigned to 1.

Warning: currently assigned JTAG instance ID 0 for jtag_uart_0/avalon_jtag_slave is shared by jtag_uart_1/avalon_jtag_slave. Reassigned to 1.

and when I try to run my NIOS II Project I get this message:

Using cable "USB-Blaster [USB-0]", device 1, instance 0x01

Pausing target processor: OK

Reading System ID at address 0x00081058: verified

Initializing CPU cache (if present)

OK

Downloading 02000000 ( 0%)

Downloaded 60KB in 1.0s (60.0KB/s)

Verifying 02000000 ( 0%)

Verified OK

Leaving target processor paused

Also I am a bit confused about where to put my Reset-/Exception vectors, at the moment both are for each cpu in the SDRAM ( CPU_1 0x200000 and 0x200020 cpu_2 0x210000 and 0x210020), furthermore .text,.rwdata, rodata and stack/heap memory are stored in SDRAM.

What I need at the moment are 2 processors which share SRAM and SDRAM, to realize that I use two mutexs.

Another question is, if it is possible to run one CPU at 100Mhz and the other at 50Mhz, sharing memory.

Thanks again for your help

Best wishes