PFC Frame
Introduction
PFC (Priority-based Flow Control) function in Ethernet.
The Priority-based Flow Control (PFC) operation is used to inhibit transmission of data frames on one or more priorities for a specified period of time. The behavior of a MAC Control client supporting PFC operation is specified in IEEE Std 802.1Q.
MA_CONTROL.request primitive
- The globally assigned 48-bit multicast address
01-80-C2-00-00-01. - The PFC opcode
16'h01-01. - A request_operand list with two operands: priority_enable_vector and time_vector.
- The PAUSE operation cannot be used to inhibit transmission of MAC Control frames.
- When MAC Control PFC operation has been enabled, MAC Control PAUSE operation shall be disabled.
- PFC is intended for use over full-duplex point-to-point links. It is not intended for EPON.
Frame format
Please refer to MAC control frame format.
Reference
- 802.3-2022 Annex 31D - MAC Control PFC operation