On 11/7/2012 12:00 PM, Vinu Arumugham wrote: > PLL jitter does not usually affect the output skew. Read the notes associated with tQH. If there's jitter on the DDR input clock you need to derate the DQ output hold time accordingly. Conrad On 11/7/2012 12:00 PM, Vinu Arumugham wrote: > PLL jitter does not usually affect the output skew. What's the mechanism? > > Thanks, > Vinu > > On 11/06/2012 10:33 PM, 吴枫 Feng Wu wrote: >> Hi Sanjay >> If you are looking at the on-chip memory controller design, the jitter will >> impact most of the timing parameter. for example, it will impact the output >> skew and input setup/hold requirement. (at least in our chip, it is the >> case. I can't confirm it is always correct). >> >> If you are looking at the board level design, in Jedec spec, there is a >> chapter related with Jitter. It shows us which parameter is impacted by >> jitter. >> I would recommend you to pay more attention to memory read command. To get >> the accurate output window at memory pin, you need to manually subtract the >> clock jitter. Of course, clock jitter itself should fulfill the requirement >> of DDR3 chip. >> Thanks >> Feng >>> ------------------------------------------------------------------ >>> To unsubscribe from si-list: >>> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >>> >>> or to administer your membership from a web page, go to: >>> //www.freelists.org/webpage/si-list >>> >>> For help: >>> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >>> >>> >>> List forum is accessible at: >>> http://tech.groups.yahoo.com/group/si-list >>> >>> List archives are viewable at: >>> //www.freelists.org/archives/si-list >>> >>> Old (prior to June 6, 2001) list archives are viewable at: >>> http://www.qsl.net/wb6tpu >>> >>> >> ------------------------------------------------------------------ >> To unsubscribe from si-list: >> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >> >> or to administer your membership from a web page, go to: >> //www.freelists.org/webpage/si-list >> >> For help: >> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >> >> >> List forum is accessible at: >> http://tech.groups.yahoo.com/group/si-list >> >> List archives are viewable at: >> //www.freelists.org/archives/si-list >> >> Old (prior to June 6, 2001) list archives are viewable at: >> http://www.qsl.net/wb6tpu >> >> >> > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > > List forum is accessible at: > http://tech.groups.yahoo.com/group/si-list > > List archives are viewable at: > //www.freelists.org/archives/si-list > > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List forum is accessible at: http://tech.groups.yahoo.com/group/si-list List archives are viewable at: //www.freelists.org/archives/si-list Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu