User guide

Figure 4-11: Combining Multiple PHY Status Signals
AND
tx_cal_busy signals
from channels
To reset controller
tx_cal_busy input port
OR
Note: This configuration also applies to the rx_cal_busy signals.
When using multiple PLLs, you can logical AND the pll_locked signals feeding the reset controller.
Similarly, you can logical OR the pll_cal_busy signals to the reset controller tx_cal_busy port as shown
below.
Figure 4-12: Multiple PLL Configuration
AND
pll_lock signals
from PLLs
To reset controller
pll_locked input port
AND
pll_cal_busy and
tx_cal_busy
signals
To reset controller
tx_cal_busy input port
OR
Resetting different channels separately requires multiple reset controllers. For example, a group of
channels configured for Interlaken requires a separate reset controller from another group of channels
that are configured for optical communication.
Timing Constraints for Bonded PCS and PMA Channels
For designs that use TX PMA and PCS Bonding, the digital reset signal (tx_digitalreset) to all TX
channels within a bonded group must meet a maximum skew tolerance imposed by physical routing. This
skew tolerance is one-half the TX parallel clock cycle (tx_clkout). This requirement is not necessary for
TX PMA Bonding or for RX PCS channels.
4-20
Timing Constraints for Bonded PCS and PMA Channels
UG-01143
2015.05.11
Altera Corporation
Resetting Transceiver Channels
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