646265-004 23
Intel
®
Ethernet Network Adapter E810-XXVDA4T
User Guide
EEC DPLL:
Current reference: GNSS-1PPS
Status: locked_ho_acq
PPS DPLL:
Current reference: GNSS-1PPS
Status: locked_ho_acq
Phase offset [ns]: 3647
The first section of the log shows the status of CGU inputs (references), including its index number.
Active references currently selected are listed in Section 4.2. EEC Ethernet equipment clock (DPLL0)
skips the 1PPS signal received on the CVL-SDP20 pin.
The second section lists all internal DPLL units. ECC (DPLL0) driving the internal clocks and PPS (DPLL1)
driving all 1PPS signals.
The E810-XXVDA4T supports embedded sync (eSync), including embedded pulse per second (ePPS),
The third section talks about the eSync, if it is enabled, as detailed in Section 4.11, “Advanced DPLL
Configuration”.
Lock times for each of the DPLLs are different and are subject to change and can take a long time to
lock depending on their initial synchronization.
Status options: invalid, freerun, locked, locked_ho_acq (locked and holdover acquired), holdover,
and uninitialized.
The Phase offset value helps to find out how well the PPS DPLL is synchronized (in 100 ns units)
4.10 DPLL Monitoring
In the default configuration, the E810-XXVDA4T driver enables monitoring of the DPLL events and
reports state changes in the default system log (dmesg) with the WARN level independently for each of
the DPLL units.
DPLLs start in a holdover mode and enter an unlocked and locked state when a valid reference input is
enabled. If the current input becomes invalid, DPLLs change state to holdover. When the reference
reappears (or a different valid input is present), the DPLL state changes to the unlocked state and locks
to a new signal.
# dmesg | grep "state changed"
[23.740121] ice 0000:01:00.0: <DPLL0> state changed to: holdover, pin CVL-SDP22
[23.740833] ice 0000:01:00.0: <DPLL1> state changed to: holdover, pin CVL-SDP22
#GNSS signal appeared
[57.857575] ice 0000:01:00.0: <DPLL0> state changed to: unlocked, pin GNSS-1PPS
[57.858088] ice 0000:01:00.0: <DPLL1> state changed to: unlocked, pin GNSS-1PPS
[119.810415] ice 0000:01:00.0: <DPLL0> state changed to: locked, pin GNSS-1PPS
[178.818056] ice 0000:01:00.0: <DPLL1> state changed to: locked, pin GNSS-1PPS
#GNSS signal lost:
[18.833552] ice 0000:01:00.0: <DPLL0> state changed to: holdover, pin GNSS-1PPS
[18.834065] ice 0000:01:00.0: <DPLL1> state changed to: holdover, pin GNSS-1PPS
#GNSS signal re-appeared:
[19.825608] ice 0000:01:00.0: <DPLL0> state changed to: unlocked, pin GNSS-1PPS
[19.826122] ice 0000:01:00.0: <DPLL1> state changed to: unlocked, pin GNSS-1PPS
[21.841638] ice 0000:01:00.0: <DPLL0> state changed to: locked, pin GNSS-1PPS
[21.850270] ice 0000:01:00.0: <DPLL1> state changed to: locked, pin GNSS-1PPS
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