MFB Enabler

ENTITY MFB_ENABLER IS

This component enables sending of MFB frames to the output. For this purpose, it uses the TX_ENABLE port. Enabling starts from the first SOF. Disabling starts from the last EOF in the current word. If this happens in the middle of a frame then all following words are sent until the EOF is found. If in this word is/are other complete frame/s then it/they are sent as well. If this happens when outside of a frame then at least the next frame (can be more) in the first following valid word is still sent to the output. The following packets are discarded. For indication of the region in which discarded frame ends, there is a flag STAT_DISCARDED.

Generics

Generic	Type	Default	Description
=====	MFB CONFIGURATION:	=====	=====
REGIONS	natural	4	any possitive value
REGION_SIZE	natural	8	any possitive value
BLOCK_SIZE	natural	8	any possitive value
ITEM_WIDTH	natural	8	any possitive value
META_WIDTH	natural	8	any possitive value
OUTPUT_REG	boolean	true	only for TX MFB interface, not for STAT

Ports

Port	Type	Mode	Description
=====	CLOCK AND RESET	=====	=====
CLK	std_logic	in
RESET	std_logic	in
=====	INPUT INTERFACE OF MFB PLUS	=====	=====
RX_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	in
RX_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	in
RX_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	in
RX_EOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE*BLOCK_SIZE))-1 downto 0)	in
RX_SOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_EOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_SRC_RDY	std_logic	in
=====	TX MFB PLUS INTERFACE WITH ENABLE	=====	=====
TX_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	out
TX_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	out
TX_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	out
TX_EOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE*BLOCK_SIZE))-1 downto 0)	out
TX_SOF	std_logic_vector(REGIONS-1 downto 0)	out
TX_EOF	std_logic_vector(REGIONS-1 downto 0)	out
TX_SRC_RDY	std_logic	out
TX_ENABLE	std_logic	in	Enable the MFB stream starting with the next frame. Disable the MFB stream after the last complete frame.
=====	OUTPUT INTERFACE OF STATISTICS	=====	=====
STAT_DISCARDED	std_logic_vector(REGIONS-1 downto 0)	out	Flag of discarded frame for each region. Valid with EOF.