Altera Cyclone IV Device Handbook page 467

Chapter 1: Cyclone IV Device Datasheet
Switching Characteristics
Figure 1–2
1
LTD = lock-to-data. LTR = lock-to-reference.
Figure 1–2. Lock Time Parameters for Manual Mode
Reset Signals
rx _ analogreset
rx _ digitalreset
CDR Control Signals
rx _ locktorefclk
rx _ locktodata
Output Status Signals
busy
Figure 1–3
Figure 1–3. Lock Time Parameters for Automatic Mode
Reset Signals
rx _ analogreset
rx _ digitalreset
Output Status Signals
busy
rx _ freqlocked
December 2016 Altera Corporation
shows the lock time parameters in manual mode.
2
t
LTR_LTD_Manual
Two parallel clock cycles
1
shows the lock time parameters in automatic mode.
2
Two parallel clock cycles
1
4
t
LTD_Manual
(2)
3
(1)
3
4
3
t
LTD_Auto
(1)
1–21
Cyclone IV Device Handbook,
Volume 3