Intel Cyclone 10 GX User Manual page 250

Resetting the Transceiver in CDR Manual Lock Mode
The numbers in this list correspond to the numbers in the following figure, which
guides you through the steps to put the CDR in manual lock mode.
1. Make sure that the calibration is complete (
transceiver goes through the initial reset sequence. The
rx_analogreset
care and can be either high or low. The
signals should be high, indicating that the transceiver is out of reset. Alternatively,
you can start directly with the CDR in manual lock mode after the calibration is
complete.
2. Assert the
reference mode. The
the
rx_digitalreset
rx_set_lockedtoref
Transceiver PHY reset controller is used, the
asserted.
3. After the
deasserted.
4. Assert the
after the CDR is locked to reference.
stable for a minimum
rx_set_locktodata
rx_is_lockedtoref
which indicates that the CDR is now set to LTD mode.
The
rx_is_lockedtoref
after asserting
5. Deassert the
6. If you are using the Transceiver PHY Reset Controller, the
gets asserted after the
that the receiver is now ready to receive data with the CDR in manual mode.
® ®
Intel Cyclone 10 GX Transceiver PHY User Guide
250
signals should be low. The
rx_set_locktoref
rx_is_lockedtodata
signal high at the same time or after
is asserted if you use the user-coded reset. When the
signal gets asserted, the
rx_digitalreset
rx_set_locktodata
t
LTR_LTD_Manual
. This is required to filter spurious glitches on
. The
rx_is_lockedtodata
status signal can be a high or low and can be ignored
rx_set_locktodata
rx_digitalreset
rx_digitalreset
4. Resetting Transceiver Channels
rx_cal_busy
rx_is_lockedtoref
rx_is_lockedtodata
signal high to switch the CDR to the lock-to-
status signal is deasserted. Assert
rx_digitalreset
rx_ready
signal high,
t
LTR_LTD_Manual
rx_is_locktoref
(15 μs), before asserting
status signal gets asserted,
high after the CDR is locked to reference.
signal after a minimum of t
signal is deasserted. This indicates
UG-20070 | 2018.09.24
is low) and the
and
rx_digitalreset
is a don't
and
rx_ready
is automatically
status signal is
(minimum 15 μs)
should be high and
(4 μs).
LTD_Manual
status signal
rx_ready
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