Consolidated calcuation of last_tkeep and tkeep_last. Changed error
checking to support unwrinkling tkeep/trailing changes in 100G
etherent and support for testing packet dropping on backup.
Original-commit: 473b0f5abe882ca316a7fe1a59234676940ef26b
Components are connected together with AxiStreamIfc. Some features
include:
(1) Add bytes to the start of a packet
(2) Remove bytes from a packet
(3) Wrappers for some older components
a. fifo - buffer but imediately pass a packet
b. packet_gate - buffer and hold till end of packet
c. width_conv - cross clock domains and change width of axi bus
The AxiStreamIf was moved from PkgAxiStreamBfm to its own file. It can
be used to connect to ports with continuous assignment.
AxiStreamPacketIf must be used procedurally but allows the following
new methods:
- reached_packet_byte - notify when tdata contains a paritcular byte
- get_packet_byte/get_packet_field - extract a byte or field from axi
- put_packet_byte/put_packet_field - overwrite a byte or field onto axi
Original-commit: c3bca6c87700054c96320de119a58f6a688dbd5a
Wade Fife