Altera 10-Gbps Ethernet MAC MegaCore Function - Manual (Page 170)

Appendix D: ToD Synchronizer D–5
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
tod_slave_valid
This signal indicates that the tod_data_slave
signal is valid and ready to be loaded into the slave
ToD clock in the following cycle.
This signal will only be high for 1 cycle, every time
a new ToD is successfully synchronized to the
slave clock domain.
tod_slave_data[n-1:0] Input 1
This signal carries the 64-bit or 96-bit format
synchronized ToD that is ready to be loaded into
the slave clock domain. The width of this signal is
determined by the TOD_MODE parameter.
The synchronized ToD will be 1 slave clock period
bigger than the master ToD because it takes 1
slave clock cycle to load this data into the slave
ToD.
Table D–3. Interface Signals for the ToD Synchronizer (Part 2 of 2)
Signal Direction Width Description