FPGA Intellectual Property
PCI Express*, Networking and Connectivity, Memory Interfaces, DSP IP, and Video IP
Annonces
FPGA community forums and blogs on community.intel.com are migrating to the new Altera Community and are read-only. For urgent support needs during this transition, please visit the FPGA Design Resources page or contact an Altera Authorized Distributor.
6673 Discussions

DDR HP controller read data valid signal is not aligned with read data

Altera_Forum
Contributeur émérite II
1 198 Visites

i use DDR hp controller to interface a micron ddr chip mt46v32m16, two chips to form 32bit width. 

but when i send out read request and wait the read data and read data valid sinal, they come back , but not aligned, 

local_rdata_valid is 11 clocks later tham local_rdata, 

how can that happen? anybody knew this issue?/
0 Compliments
2 Réponses
Altera_Forum
Contributeur émérite II
478 Visites

I encountered the same question as you. Hope someone can solve it !

0 Compliments
Altera_Forum
Contributeur émérite II
478 Visites

hi, there, 

i have solved my problem, it just need a longer time reset, for example 200ms, on my board, i think this is caused by my Vref dc-dc chip don't output right when i download my new sof file for a while. 

hope useful for u!
0 Compliments
Répondre