4. Functional Description
The H-tile Ethernet Hard IP core MAC+PCS variations implement an Ethernet MAC in accordance with the IEEE 802.3 Ethernet Standard. The IP core handles the frame encapsulation and flow of data between client logic and an Ethernet network through a 100-Gbps Ethernet PHY implemented in hard IP.
In the transmit direction, the MAC accepts client frames, and inserts inter-packet gap (IPG), preamble, start of frame delimiter (SFD), padding, and CRC bits before passing them to the PHY. You can configure the MAC to accept some of the additions with the client frame. The MAC also updates the TX statistics counters. The PHY encodes the MAC frame as required for reliable transmission over the media to the remote end.
In the receive direction, the PHY passes frames to the MAC. The MAC accepts frames from the PHY, performs checks, updates statistics counters, strips out the CRC, preamble, and SFD, and passes the rest of the frame to the client. In RX preamble pass-through mode, the MAC passes on the preamble and SFD to the client instead of stripping them out. You can configure the MAC to provide the full RX frame at the client interface, the frame with CRC bytes removed, or the frame with CRC and RX PAD bytes removed.
The H-tile Ethernet Hard IP core also supports PCS Only variations. These variations provide an MII interface to the client and transmit and receive Ethernet packets through a 100-Gbps Ethernet PHY implemented in hard IP.
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