Forum Discussion
Locate all FF in the OBUF
Hi
What is the constraint to locate all the FF in the OBUF ?
I need a minimum and constant routing latency for each synthesis
Seems like you're using Pro version. Then probably can use GPIO IP under section I/O in IP Catalog. The register mode choose DDIO.
6 Replies
- sstrell
Super Contributor
Fast Output Register assignment in the Assignment Editor.
- ShengN_altera
Super Contributor
Hi,
May I know do you have any further concern or consideration?
Thanks,
Regards,
Sheng
- ymiler
Contributor
Thank you for the reply
I have 1 more question (relevant to the previous question),
I need to create a source synchronous connection between two FPGAs.
FPGA A needs to transmit 32 data bits along with a clock signal to FPGA B. All 32 bits are sampled by a PLL clock ( FPGA A )
and then sent to 32 IO_OBUF pins.
The same PLL clock, which samples the 32 data bits, is also connected to another IO_OBUF.
I would like to align the latency between the clock and the 32 data bits.
Is there an IP core or alternative method to create an ODDR that is sampled by the PLL clock and generates a new clock that is aligned with the flip-flop for the 32 data bits?
- ShengN_altera
Super Contributor
Hi,
Probably can use DDIO IP for ODDR.
Thanks,
Regards,
Sheng
- ymiler
Contributor
DDIO ?
There is no IP name like it in the IP catalog
- ShengN_altera
Super Contributor
Seems like you're using Pro version. Then probably can use GPIO IP under section I/O in IP Catalog. The register mode choose DDIO.