Description

In the Ten Gigabit Ethernet PCS/PMA core example design, there are some unnecessary connection to the SFP TX_FAULT and Signal_Detect inputs.

• Use of the tx_fault and signal_detect terms in the core Tx reset logic in the example design is unnecessary.
• Use of tx_fault in the core RX reset logic in the example design is unnecessary.
• Signal_detect is not required to be connected to the Rx reset logic below and can be removed if unavailable, but if available it is recommended to use.

Solution

The equation in core_name_example_design.v:

core_reset_tx_tmp <= (not(tx_resetdone_int) or reset or
tx_fault or not(signal_detect));

Can be rewritten to the following:

core_reset_tx_tmp <= (not(tx_resetdone_int) or reset);

The equation in core_name_example_design.v:

core_reset_rx_tmp <= (not(rx_resetdone_int) or reset or
tx_fault or not(signal_detect));

can be rewritten to the following:

core_reset_rx_tmp <= (not(rx_resetdone_int) or reset or
or not(signal_detect));

The same is true for the core_name_example_design.vhd file.

These changes are included in the core in the 2013.1 release.