EP4CE30F29C7N Datasheet, PDF (381/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

Chapter 2: Cyclone IV Reset Control and Power Down
2–7
Transceiver Reset Sequences
Transmitter Only Channel
This configuration contains only a transmitter channel. If you create a Transmitter
Only instance in the ALTGX MegaWizard Plug-In Manager in Basic ×4 functional
mode, use the reset sequence shown in Figure 2–3.
Figure 2–3. Sample Reset Sequence for Bonded and Non-Bonded Configuration Transmitter Only Channels
Reset and Power-Down Signals
1 s
1
pll_areset
2
4
tx_digitalreset
Output Status Signals
3
pll_locked
As shown in Figure 2–3, perform the following reset procedure for the Transmitter
Only channel 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 signal asserted during this time period. After you
de-assert the pll_areset signal, the multipurpose PLL starts locking to the
transmitter input reference clock.
3. When the multipurpose PLL locks, as indicated by the pll_locked signal going
high (marker 3), de-assert the tx_digitalreset signal (marker 4). At this point, the
transmitter is ready for transmitting data.
May 2013 Altera Corporation
Cyclone IV Device Handbook,
Volume 2