PGP Ethernet Version1

WARNING

Only "point-to-point" mode has been tested.

"Network" mode going through an actual 100GbE network switch (+ stress testing through the switch) has not been done yet.

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

Word#	Word's BYTE	Type	Name	Description	Note
0	[5:0]	Header	DestMac	Destination MAC	Network mode only
0	[11:6]	Header	SrcMac	Source MAC	Network mode only
0	[13:12]	Header	EtherType	TBD Value	Network mode only
0	14	Header	Version	0x1	Hard coded
0	15	Header	TID	Transaction ID	Increments once per packet Used for out-of-order frame reorganizing in network mode
0	[17:16]	Header	Pause	Virtual Channel Pause	1 bit per Virtual Channel
0	18	Header	VC	Virtual Channel Index	BIT[3:0]: Virtual Channel Index BIT[7:4]: Reserved
0	19	Header	tUserFirst	first 8-bits of tUser
0	20	Header	OpCodeEn	OP-code Enable
0	[29:20]	Header	Reserved	Reserved	Zeros
0	[31:30]	Header	HdrXsum	16-bit Header Checksum	Header Only
0	[47:32]	Header	OpCodeData	128-bit OP-code Data	Supports 64-bit timestamp + more information
0	[63:48]	Header	UserData	128-bit User Data	Sampled every packet sent
1	[63:0]	Payload	AXIS Data	User Payload Data
...	...	...	...	...
(MAX_SIZE/64)	[63:0]	Payload	AXIS Data	User Payload Data
(MAX_SIZE/64)+1	0	Footer	tKeepLast	TKEEP on last payload word	Converted from byte map to an integer
(MAX_SIZE/64)+1	1	Footer	EOF/EOFE	EOF and EOFE marker	BIT0 = EOF, BIT1 = EOFE
(MAX_SIZE/64)+1	[3:2]	Footer	Pause	Virtual Channel Pause	paused bits are sampled and latched during the payload transport
(MAX_SIZE/64)+1	[5:4]	Footer	PayloadSize	Number of bytes in payload	Units of bytes

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