I just started to use the feature of the altsyncram megafunction to initialize its content out of a hex file. This is a fine thing, but during debugging with modelsim i found an error in altera_mf.vhd. While reading the .hex file, the address offset if calculated the wrong way, as the databus-width of the ram is ignored. So when ram is used with an other width than 8 bit - there is an error at the initialization and the hex file won't load successfully.
To correct this - open altera_mf.vhd (which is located at ../quartus/eda/sim_lib/) - scroll to line# 22857 and replace
m_istartadd := HEX_STR_TO_INT(m_startadd); with
if (use_a) then
m_istartadd := HEX_STR_TO_INT(m_startadd) / (width_a/8);
else
m_istartadd := HEX_STR_TO_INT(m_startadd) / (width_b/8);
end if; I know this is more a quartus thing and this is a nios forum - but
- i dont know where else to post it
- someone from altera could read it and pass it to a responsible person to fix it in the next release of quartus
- someday it could be usefull to YOU !!
have fun
stonie
