Is there a problem with merging PLL(s) in the ALTLVDS_RX megafunction in the Quartus II software version 10.0?

Yes, there is a problem with merging PLL(s) in the ALTLVDS_RX megafunction in the Quartus® II software version 10.0 and 10.0 SP1. The option “Use shared PLL(s) for receivers and transmitters” can not be selected in the ALTLVDS_ RX megafunction.

The workaround is to set the “common_rx_tx_pll” to “ON” in the generated ALTLVDS_RX variation file.

VHDL code Example:

 common_rx_tx_pll => "OFF",  (Old assigned value)

 common_rx_tx_pll => "ON" ,   (Newly assigned value)

Verilog code Example:

ALTLVDS_RX_component.common_rx_tx_pll = “OFF”, (Old assigned value)

ALTLVDS_RX_component.common_rx_tx_pll = “ON”, (Newly assigned value)