Chapter 1: Cyclone IV Device Datasheet
1–21
Switching Characteristics
December 2013
Altera Corporation
Figure 1–2 shows the lock time parameters in manual mode.
1 LTD = lock-to-data. LTR = lock-to-reference.
Figure 1–3 shows the lock time parameters in automatic mode.
Figure 1–2. Lock Time Parameters for Manual Mode
rx _ analogreset
rx _ digitalreset
Reset Signals
Output Status Signals
rx _ locktorefclk
2
3
4
CDR Control Signals
rx _ locktodata
3
busy
1
Two parallel clock cycles
LTD_Manual (2)
t
LTR_LTD_Manual (1)
t
Figure 1–3. Lock Time Parameters for Automatic Mode
Reset Signals
rx _ analogreset
2
Output Status Signals
rx _ freqlocked
3
rx _ digitalreset
4
busy
1
Two parallel clock cycles
LTD_Auto (1)
t
