EP4CE30F29C7N Datasheet, PDF (383/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

Chapter 2: Cyclone IV Reset Control and Power Down
2–9
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_{LTD_Auto} time for the
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.
Figure 2–5. Sample Reset Sequence for Bonded Configuration Receiver and Transmitter Channels—Receiver CDR in
Manual Lock Mode
Reset Signals
1 μs
1
2
pll_areset
(txurstpcs) tx_digitalreset
(rxurstpma) rx_analogreset
4
6
(rxurstpcs) rx_digitalreset
8
CDR Control Signals
rx_locktorefclk[0]
rx_locktorefclk[n] (2)
rx_locktodata[0]
rx_locktodata[n] (2)
t_{LTD_Manual} (1)
7
7
t_{LTR_LTD_Manual} (3)
7
7
Output Status Signals
3
pll_locked
busy (4)
Two parallel clock cycles
5
Notes to Figure 2–5:
(1) For t_{LTD_Manual} duration, refer to the Cyclone IV Device Datasheet chapter.
(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_{LTR_LTD_Manual} duration, refer to the Cyclone IV Device Datasheet chapter.
(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.
May 2013 Altera Corporation
Cyclone IV Device Handbook,
Volume 2