PGP Ethernet Version1

Support "point-to-point" and "network" mode
- "point-to-point" by default (better logic optimization)
Layer 2 Ethernet framing
- Wrapper on the Ethernet MAC
- Targeting 100G Hard IP MAC
  - 512-bit AXI Stream interface
Chuck up the stream to MAX_SIZE=1024B (default)
- Support 8192B via VHDL generic
Use the MAC's FCS for error checking

Word#	Word's BYTE	Name	Description	Note
0	[5:0]	DestMac	Destination MAC	Network mode only
0	[11:6]	SrcMac	Source MAC	Network mode only
0	[15:12]	EtherType	TBD Value	Network mode only
0	16	Version	0x1	Hard coded
0	17	TID	Transaction ID	Increments once per packet Used for out-of-order frame reorganizing in network mode
0	[19:18]	Pause	Virtual Channel Pause	1 bit per Virtual Channel
0	20	VC	Virtual Channel Index	BIT[3:0]: Virtual Channel Index BIT[7:4]: Reserved
0	21	tUserFirst	first 8-bits of tUser
0	22	tUserLast	last 8-bits of tUser
0	[31:23]	Reserved	Reserved	Zeros
0	[47:32]	OpCodeData	128-bit OP-code Data	64-bit to support full timestamp triggering with bits to spare
0	[63:48]	UserData	128-bit User Data	Sampled every packet sent
1	[63:0]	Payload	User Payload Data
...	...	...	...
(MAX_SIZE/64)	[63:0]	Payload	User Payload Data

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