Forum Discussion

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

SOPC builder - connect a custom component to tightly coupled i/f?

Hi, is there any way to get SOPC to accept a custom component instead of the "on-chip RAM" as the tightly coupled instruction memory interface? I've tried everything I can think of but SOPC bui...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Someone was asking me about this the other day. The requirements for a TCM connection in SOPC Builder were:

1) 32-bit data

2) had to be the Altera on-chip RAM component

3) master to slave connection had to be 1:1

4) fixed read latency which had to be 1 clock cycle

In Qsys the restrictions where relaxed apparently and# 2 above is no longer needed (no idea if that was an oversight...) Anyway if you create a slave with properties 1, 3, and 4 above you should be able to hook it up to the master. Make sure that it's on the same clock domain as the tightly coupled master from the Nios II CPU since I'm not sure if this is being validated currently (bad things will happen if there was a clock crossing so don't do it).