Altera Cyclone IV Device Handbook page 383

Chapter 2: Cyclone IV Reset Control and Power Down
Transceiver Reset Sequences
4. For the receiver operation, after deassertion of busy signal, wait for two parallel
clock cycles to deassert the rx_analogreset signal.
5. Wait for the rx_freqlocked signal from each channel to go high. The
rx_freqlocked signal of each channel may go high at different times (indicated by
the slashed pattern at marker 7).
6. In a bonded channel group, when the rx_freqlocked signals of all the channels
has gone high, from that point onwards, wait for at least t
receiver parallel clock to be stable, then deassert the rx_digitalreset signal
(marker 8). At this point, all the receivers are ready for data traffic.
Receiver and Transmitter Channel—Receiver CDR in Manual Lock Mode
This configuration contains both a transmitter and receiver channel. When the
receiver CDR is in manual lock mode, use the reset sequence shown in
Figure 2–5. Sample Reset Sequence for Bonded Configuration Receiver and Transmitter Channels—Receiver CDR in
Manual Lock Mode
Reset Signals
1
pll_areset
(txurstpcs) tx_digitalreset
(rxurstpma) rx_analogreset
(rxurstpcs) rx_digitalreset
CDR Control Signals
rx_locktorefclk[0]
rx_locktorefclk[n] (2)
rx_locktodata[0]
rx_locktodata[n] (2)
Output Status Signals
pll_locked
busy (4)
Notes to Figure 2–5:
(1) For t duration, refer to the
LTD_Manual
(2) The number of rx_locktorefclk[n] and rx_locktodata[n] signals depend on the number of channels configured. n=number of channels.
(3) For t duration, refer to the
LTR_LTD_Manual
(4) The busy signal is asserted and deasserted only during initial power up when offset cancellation occurs. In subsequent reset sequences, the busy
signal is asserted and deasserted only if there is a read or write operation to the ALTGX_RECONFIG megafunction.
September 2014 Altera Corporation
1 µs
2
4
3
Two parallel clock cycles
Cyclone IV Device Datasheet
Cyclone IV Device Datasheet
6
t
LTD_Manual
7
7
t (3)
LTR_LTD_Manual
7
7
5
chapter.
chapter.
time for the
LTD_Auto
Figure
8
(1)
Cyclone IV Device Handbook,
2–9
2–5.
Volume 2