Page History

...

• Support "point-to-point" and "network" mode
  • "point-to-point" by default (better logic optimization)
• 3 layer of Ethernet:
  • Layer1: PHY
  • Layer2: MAC
  • Layer3: PGP ETH V1

• Layer 3 Ethernet framing

  • Wrapper on the Ethernet MAC
  • Targeting 100G Hard IP MAC
    
    • 512-bit AXI Stream interface
• 512-bit header and 48-bit footer
  
  • Header and payload always 512-bit wide
  • Simplify the logic for 100GbE MAC interface (no AxiStreamShifting required)
• Chuck up the stream to MAX_SIZE (8196B default)
  
  • 91.8% efficient = 1024B/(1024B + 4B FCS + 12B intergap + 8B preamble + 64B PGP Ethernet Header + 4B PGP Ethernet Footer)
  • 95.7% efficient = 2048B/(2048B + 4B FCS + 12B intergap + 8B preamble + 64B PGP Ethernet Header + 4B PGP Ethernet Footer)
  • 97.8% efficient = 4096B/(4096B + 4B FCS + 12B intergap + 8B preamble + 64B PGP Ethernet Header + 4B PGP Ethernet Footer)
  • 98.9% efficient = 8196B/(8196B + 4B FCS + 12B intergap + 8B preamble + 64B PGP Ethernet Header + 4B PGP Ethernet Footer)
  • Smaller MAX_SIZE lower the latency for publishing the virtual channel "pause" status to the remote side
• Use the MAC's FCS for error checking
• Virtual channel flow control done at the L3 layer (instead of ETH pause)
• Support up to 16 Virtual channels on the same link
  • Same as PGPv3

...