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Altera_Forum
Honored Contributor I
762 Views

DDR3 SDRAM UNIPHY HPC problem with read

Quartusii version 13.1,CycloneV,MT41K256M16HA 

The main parameters 

uniphy hard ipcore side: 

memory clock 300Mhz 

total interface width 32: DDR3 total bit width used is 16bits capacity of 512MB, 1GB to extend it to 32bits 

full rates, burst size: 128, DQ width: 64bit 

Avalon-MM side: data width 64, clock: 125Mhz 

 

Details: When read, the first read command is issued in response to the read DDR3 ipcore corresponding address data; cross-write operation (normal); reading instruction and reading the second instruction after the issue, did not respond ipcore (cs_n, ras_n, cas_n , we_n, mem_ba, mem_a no change), FIG. 

http://www.alteraforum.com/forum/imagehttp://www.alteraforum.com/forum/attachment.php?attachmentid=1...  

 

Best ragards 

 

LSR
0 Kudos
2 Replies
Altera_Forum
Honored Contributor I
11 Views

Hi,everyone 

I have found why the read signal is normal,but can not reproduce the DDR data .  

Avalon-MM protocol: In busrt Write operation,the local_ready signal is low and indicate the slave not ready to 

receive write commands from the master,so write command remains unchanged until local signal high and this  

burst write operation is complete.ortherwise,it will lead to the subsequent read signal is not be ipcore response. 

----------Poor english,if wrong please advise,thank you------------ 

 

 

 

LSR
Altera_Forum
Honored Contributor I
11 Views

Hi,everyone 

I have found why the read signal is normal,but can not reproduce the DDR data .  

Avalon-MM protocol: In busrt Write operation,the local_ready signal is low and indicate the slave not ready to 

receive write commands from the master,so write command remains unchanged until local signal high and this  

burst write operation is complete.ortherwise,it will lead to the subsequent read signal is not be ipcore response. 

----------Poor english,if wrong please advise,thank you------------ 

 

LSR
Reply