MACsec Intel® FPGA IP User Guide

ID 736108
Date 10/02/2023
Public

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Document Table of Contents

2.2.1.2. Common Port Demux Interface

Table 8.  Common Port Demux InterfaceThe variable <n> in this table refers to the specific port number being referenced.
Signal Name Width Direction Description
encrypt_ss_user_p<n>_app_pp_axi_st_aclk 1 Input Clock for AXI-ST Interface
encrypt_ss_user_p<n>_app_pp_axi_st_areset_n 1 Input Reset for AXI-ST Interface
encrypt_ss_user_p<n>_pp_app_tvalid 1 Output

TVALID indicates that the master is driving a valid transfer.

A transfer takes place when both TVALID and TREADY are asserted.

encrypt_ss_user_p<n>_pp_app_tdata

64

128

256

512

Output

TDATA is the primary payload that is used to provide the data that is passing across the interface.

encrypt_ss_user_p<n>_pp_app_tkeep

8

16

32

64

Output

TKEEP is the byte qualifier that indicates whether the content of the associated byte of TDATA is processed as part of the data stream.

encrypt_ss_user_p<n>_pp_app_tlast 1 Output TLAST indicates the boundary of a packet.
encrypt_ss_user_p<n>_pp_app_tid 6 Output

TID is the data stream identifier that indicates different stream of data. This can be used as a Channel ID for different streams sharing the same port.

encrypt_ss_user_p<n>_app_pp_tready 1 Input TREADY indicates that the slave can accept a transfer on the current cycle.
encrypt_ss_user_p<n>_pp_app_tuser_last_segment <segment_number> 1 Output

Port<n> packet segmentation boundary indication for higher bandwidth transfer.

*last_segment indicates which 64-bit segment of the data bus the last segment is aligned to.

segment_number ranges from 0 to 7.

For the following data widths, the corresponding segment number bit applies:
  • 64—NA
  • 128—last_segment[1:0]
  • 256—last_segment[3:0]
  • 512—last_segment[7:0]
encrypt_ss_user_p<n>_pp_app_rx_tuser_client 7 Output

Ethernet Packet error status:

  • [6] - PHY error
  • [5] - CRC error
  • [4] - Length error => Payload that arrives longer than advertised length
  • [3] - Oversize error
  • [2] - Undersized (frame shorter than 64B) or oversized (larger than max_frame)
  • [1] - FCS error
  • [0] - Malformed
encrypt_ss_user_p<n>_pp_app_tx_tuser_client 7 Output

Ethernet Packet error status:

  • [6] - PHY error
  • [5] - CRC error
  • [4] - Length error => Payload that arrives longer than advertised length
  • [3] - Oversize error
  • [2] - Undersized (frame shorter than 64B) or oversized (larger than max_frame)
  • [1] - FCS error
  • [0] - Malformed
encrypt_ss_user_p<n>_pp_app_tuser_usermetadata 16 Output

User metadata which is tag along with incoming/outgoing packet into the MACsec IP. This metadata is not processed by MACsec IP and it is passed through the IP. One of the use cases supports PTP use case where a local timestamp or timer can be sent through this metadata on the MACsec ingress. The user can compare this local timestamp or timer at MACsec egress to determine the time taken for the request to go through the MACsec IP pipeline.