Under all core generation settings, the core contains a configurable Pause frame MAC Source Address (see MAC Configuration Registers) and the use of configuration vectors allows this to be set independently for RX and TX. This MAC Address is used by the flow control logic, received pause frames are matched against this address appearing in the Destination Address field, pause frames initiated by the core place this MAC Address into the Source Address field of a transmitted pause frame.
When the TEMAC solution is generated with the optional frame filter, the core contains a configurable Unicast Address (see MAC Configuration Registers). This is used by the frame filter to match against this address appearing in the Destination Address field of all received frames. The core, for full flexibility, allows the Pause frame MAC Source Address and the Unicast Address (when present) to be configured independently.
However, under standard network operating conditions the Pause frame MAC Source Address should be set to the Unicast Address.
The core, when generated without a management interface, contains independent RX and TX Pause Frame MAC source Address control which should be set to the same value.