Author:

Tomas Martinek

The Input Packet Buffer is used as a storage for incoming packets, before they are processed by others parts of the design. The input packets arrive at the standard XGMII interface and they are evenly distributed into four Input Buffers (IBUF), so that the 10Gbps input data stream is split into four 2.5Gps streams. In association with the packet data, the time-stamp and identification information is stored into the IBUF. Time-stamp is generated by Timestamp unit (TSU) and represents precise time information of packet arrival synchronized with external GPS module and used for producing statistical data. Among others, the IBUF provides needful CRC computation checking.

Top Level Architecture

XGMII Buffer Architecture

IBUF Core Architecture