EP4CE30F29C7N Datasheet, PDF (384/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

2–10
Chapter 2: Cyclone IV Reset Control and Power Down
Transceiver Reset Sequences
As shown in Figure 2–5, perform the following reset procedure for the receiver CDR
in manual lock mode configuration:
1. After power up, assert pll_areset for a minimum period of 1 s (the time
between markers 1 and 2).
2. Keep the tx_digitalreset, rx_analogreset, rx_digitalreset, and
rx_locktorefclk signals asserted and the rx_locktodata signal deasserted during
this time period. After you deassert the pll_areset signal, the multipurpose PLL
starts locking to the input reference clock.
3. After the multipurpose PLL locks, as indicated by the pll_locked signal going
high (marker 3), deassert the tx_digitalreset signal (marker 4). For the receiver
operation, after deassertion of the busy signal, wait for two parallel clock cycles to
deassert the rx_analogreset signal.
4. In a bonded channel group, wait for at least t_{LTR_LTD_Manual}, then deassert
rx_locktorefclk and assert rx_locktodata (marker 7). At this point, the receiver
CDR of all the channels enters into lock-to-data mode and starts locking to the
received data.
5. After asserting the rx_locktodata signal, wait for at least t_{LTD_Manual} before
deasserting rx_digitalreset (the time between markers 7 and 8). At this point,
the transmitter and receiver are ready for data traffic.
Non-Bonded Channel Configuration
In non-bonded channels, each channel in the ALTGX MegaWizard Plug-In Manager
instance contains its own tx_digitalreset, rx_analogreset, rx_digitalreset, and
rx_freqlocked signals.
You can reset each channel independently. For example, if there are four non-bonded
channels, the ALTGX MegaWizard Plug-In Manager provides four each of the
following signals: tx_digitalreset, rx_analogreset, rx_digitalreset, and
rx_freqlocked.
Table 2–6 lists the reset and power-down sequences for one channel in a non-bonded
configuration under the stated functional modes.
Table 2–6. Reset and Power-Down Sequences for Non-Bonded Channel Configurations
Channel Set Up
Transmitter Only
Receiver Only
Receiver Only
Receiver and Transmitter
Receiver and Transmitter
Receiver CDR Mode
Basic ×1
Automatic lock mode
Manual lock mode
Automatic lock mode
Manual lock mode
Refer to
“Transmitter Only Channel” on page 2–11
“Receiver Only Channel—Receiver CDR in Automatic
Lock Mode” on page 2–11
“Receiver Only Channel—Receiver CDR in Manual Lock
Mode” on page 2–12
“Receiver and Transmitter Channel—Receiver CDR in
Automatic Lock Mode” on page 2–13
“Receiver and Transmitter Channel—Receiver CDR in
Manual Lock Mode” on page 2–14
1 Follow the same reset sequence for all the other channels in the non-bonded
configuration.
Cyclone IV Device Handbook,
Volume 2
May 2013 Altera Corporation