
Chapter 6: XAUI PHY IP Core 6–13
Clocks, Reset, and Powerdown Interfaces
November 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
Clocks, Reset, and Powerdown Interfaces
Figure 6–8 illustrates the clock inputs and outputs for the XAUI IP Cores with hard
PCS and PMA blocks.
Figure 6–9 illustrates the clock inputs and outputs for the XAUI IP Cores with soft
PCS and PMA blocks.
Table 6–10 describes the optional reset signals. Refer to Transceiver Reconfiguration
Controller for additional information about reset.
Figure 6–8. Clock Inputs and Outputs, Hard PCS
Figure 6–9. Clock Inputs and Outputs, Soft PCS
XAUI Hard IP Core
4 x 3.125 Gbps serial
Hard PCS
tx_coreclk
rx_cruclkpll_inclk
coreclkout
xgmii_rx_clk
xgmii_tx_clk
pll_ref_clk
phy_mgmt_clk
4
4
PMA
XAUI Soft IP Core
4 x 3.125 Gbps serial
xgmii_rx_clk
xgmii_tx_clk
pll_ref_clk
phy_mgmt_clk
4
4
Soft PCS
pma_pll_inclk
pma_tx_clkout
tx_clkout
pma_rx_clkout
pll_ref_clk
sysclk
PMA
rx_recovered_clk
Table 6–10. Clock and Reset Signals
Signal Name Direction Description
pll_ref_clk
Input
This is a 156.25 MHz reference clock that is used by the TX PLL and
CDR logic.
rx_analogreset
Input
This signal resets the analog CDR and deserializer logic in the RX
channel. It is only available in the hard IP implementation.
rx_digitalreset
Input PCS RX digital reset signal.
tx_digitalreset
Input
PCS TX digital reset signal. If your design includes bonded TX PCS
channels, refer to Timing Constraints for Reset Signals when Using
Bonded PCS Channels for a SDC constraint you must include in your
design.
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