Forum Discussion

jaykrishna1's avatar
jaykrishna1
Icon for New Contributor rankNew Contributor
58 minutes ago

HSIO Differential Clock Output VOD and VOCM

Dear Intel Support Team,

We are using the Agilex 5 FPGA A5ED065BB32AI4S in our design.

We plan to use an HSIO differential clock output from the FPGA and connect this output to the differential clock input of an external PLL/clock device.

The FPGA HSIO supply for this interface is currently 1.2 V.

While reviewing the Agilex 5 True Differential Signaling documentation and differential I/O design guidelines, we could not find the complete electrical specifications for the HSIO differential clock output, particularly the following parameters:

  1. Differential output voltage (VOD) – minimum, typical, and maximum values.
  2. Output common-mode voltage (VOCM) – minimum, typical, and maximum values.
  3. Whether these VOD and VOCM values are dependent on the VCCIO/HSIO supply voltage of 1.2 V.
  4. Whether the specified VOD/VOCM values are applicable when the HSIO output is configured specifically as a clock output for feeding an external PLL/clock input.
  5. Any recommended termination, AC-coupling, or DC-coupling configuration for this application.
  6. Please confirm whether there are any restrictions on using the HSIO clock output to directly drive an external differential PLL reference-clock input.

Could you please provide the applicable DC and AC electrical specifications or the relevant datasheet/table for the HSIO differential clock output of the A5ED065BB32AI4S?

We specifically need the VOD and VOCM values to verify electrical compatibility with the external PLL input.

Regards,
Jay Krishna

No RepliesBe the first to reply