Altera Cyclone IV, Device Handbook

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Chapter 2: Cyclone IV Reset Control and Power Down 2–7
Transceiver Reset Sequences
September 2014 Altera Corporation Cyclone IV Device Handbook,
Volume 2
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 .
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.
Figure 2–3. Sample Reset Sequence for Bonded and Non-Bonded Configuration Transmitter Only Channels
Reset and Power-Down Si g nals
1 2
1  s
4
Output Status Si g nals
3
pll_areset
tx_digitalreset
pll_locked