SerialLite II IP Core User Guide

ID 683179
Date 7/13/2021
Public
Document Table of Contents

2.8.9. Data Type

The regular data port allows data to be formatted as a stream or in packets.
Table 9.  Data Type
Data Type Description
Packets
  • Packet mode for packet-based protocols.
  • The data port expects data to arrive in packets, marked by asserting start of packet (SOP) at the beginning and end of packet (EOP) at the end of the packet.
  • The receiver passes these packets to the user logic via the Atlantic interface, with the packet boundaries marked by SOP and EOP.
Streaming
  • Streaming data has no beginning or end.
  • It acts like an infinite-length packet and represents an unending sequence of data bytes.
  • The only Atlantic signals present are txrdp_ena, txrdp_dav, and txrdp_dat (valid and data) in the transmitter, and rxrdp_ena and rxrdp_dat for a receiver instantiation.
  • There is no backpressure for the receiver function; consequently, the user logic must accept the data when rxrdp_ena is high. There is only backpressure in the transmitter function if clock compensation is enabled (txrdp_dav is negated when the clock compensation sequence is inserted.
  • When the system link up is complete, your logic should provide data continuously. The SerialLite II IP core does not encapsulate streaming data. .