Embedded Development Tools

[vinay.vedant]

Hi friends,

i am using ML 403 board and PLB uart16550, if i changed processor clock frequency to 300 mhz.. will it affects the Uart response??

[heritage]

Not sure which version of EDK you are using but Remember the PLB likes to runs at 100Mhz don't waste your time running it faster.  Second you can run the processor at 400Mhz with no problems.  Just remember to follow the ratio rule.  Also if you change clocks remember to update all your cores MHS file.  If you open up XMD and the window goes away you need to make some changes because your processor is being kept in reset or your design is broken.   Also if you do a memory read or memory write and the XMD window returns the address just before the one you typed in your bus is locked up.  Remember 100Mhz is good you can get a design to run much faster but trust me running at 150Mhz is like getting a root canal (V4FX). 

Processor 400Mhz, Primary PLB DDR/BRAM 100Mhz, Second PLB(OPB old) UART 50Mhz and everything else.

SLOW=GOOD=TIME Saved

[k-50]

Hi!

There are two PLBs in PPC.

I create a system where CPU work on 150Mhz, PLB0 on 100Mhz and PLB1 on 50Mhz(to communicate with slow peripheral, I don't want use OPB).

Is it correct or both PLB bus should work on the same clock? 

My second questions is how to define timing constraints? When I make PLB clock higher there is no error/warning during compilation, but system do not work.  

Message Edited by k-50 on 01-20-2009 12:37 PM