Forum Discussion
ContributorHow could I understand “IOPLL could drive the lvds tx transmitter in adjacent bank"
Hi,
that sounds plausible:problem is that tx_outclock is generated differently in single-bank and "wide" SERDES. SERDES IP editor doesn't know about final implementation, thus it accpects tx_outclock phaseshifts that are only applicable in single bank design.
A separate pair of PLL outputs drives tx_outclock SERDES channel through dedicated "phase_shifted_tx_outclock_serdes.outclock_tree". In wide SERDES topology, the phase shifted outclock is apparently not available or not used for some reason. You can only implement phase shift values that are aligned with regular bit clock, e.g. 180° for frequency factor 2.
SERDES IP editor should issue a warning about possible phase shift implementation issues.
Super ContributorHi,
that sounds plausible:problem is that tx_outclock is generated differently in single-bank and "wide" SERDES. SERDES IP editor doesn't know about final implementation, thus it accpects tx_outclock phaseshifts that are only applicable in single bank design.
A separate pair of PLL outputs drives tx_outclock SERDES channel through dedicated "phase_shifted_tx_outclock_serdes.outclock_tree". In wide SERDES topology, the phase shifted outclock is apparently not available or not used for some reason. You can only implement phase shift values that are aligned with regular bit clock, e.g. 180° for frequency factor 2.
SERDES IP editor should issue a warning about possible phase shift implementation issues.
lambert_yuSERDES IP editor should issue a warning about possible phase shift implementation issues.
Your advice is very well. Now there's no this warning message.
A separate pair of PLL outputs drives tx_outclock SERDES channel through dedicated "phase_shifted_tx_outclock_serdes.outclock_tree". In wide SERDES topology, the phase shifted outclock is apparently not available or not used for some reason. You can only implement phase shift values that are aligned with regular bit clock, e.g. 180° for frequency factor 2.
Where could I find this content ? Or just internal use?
- FvMI see the SERDES implementation details in post-mapping netlist viewer.
