MFB Splitter Simple

ENTITY MFB_SPLITTER_SIMPLE IS

This component transmits received packets on one interface to one out of the two outputs according to the select bit.

Generics

Generic	Type	Default	Description
REGIONS	natural	2	number of regions in a data word
REGION_SIZE	natural	8	number of blocks in a region
BLOCK_SIZE	natural	8	number of items in a block
ITEM_WIDTH	natural	8	number of bits in an item
META_WIDTH	natural	8	number of bits for metadata in a single region

Ports

Port	Type	Mode	Description
CLK	std_logic	in
RST	std_logic	in
=====	rx interface	=====	=====
RX_MFB_SEL	std_logic_vector(REGIONS-1 downto 0)	in	is only valid with asserted sof signal
RX_MFB_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	in
RX_MFB_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	in
RX_MFB_SOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB_EOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	in
RX_MFB_EOF_POS	std_logic_vector(REGIONS*log2(REGION_SIZE*BLOCK_SIZE)-1 downto 0)	in
RX_MFB_SRC_RDY	std_logic	in
RX_MFB_DST_RDY	std_logic	out
=====	tx interface 0	=====	=====
TX0_MFB_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	out
TX0_MFB_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	out
TX0_MFB_SOF	std_logic_vector(REGIONS-1 downto 0)	out
TX0_MFB_EOF	std_logic_vector(REGIONS-1 downto 0)	out
TX0_MFB_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	out
TX0_MFB_EOF_POS	std_logic_vector(REGIONS*log2(REGION_SIZE*BLOCK_SIZE)-1 downto 0)	out
TX0_MFB_SRC_RDY	std_logic	out
TX0_MFB_DST_RDY	std_logic	in
=====	tx interface 1	=====	=====
TX1_MFB_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	out
TX1_MFB_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	out
TX1_MFB_SOF	std_logic_vector(REGIONS-1 downto 0)	out
TX1_MFB_EOF	std_logic_vector(REGIONS-1 downto 0)	out
TX1_MFB_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	out
TX1_MFB_EOF_POS	std_logic_vector(REGIONS*log2(REGION_SIZE*BLOCK_SIZE)-1 downto 0)	out
TX1_MFB_SRC_RDY	std_logic	out
TX1_MFB_DST_RDY	std_logic	in

MFB Splitter Simple Gen

ENTITY MFB_SPLITTER_SIMPLE_GEN IS

This is a 1:N MFB splitter. RX_MFB_SEL selects the output for each frame. The whole RX word is sent to every output in the same clock cycle. Each output gets the word with the SOFs and EOFs of the other outputs masked out. TX_MFB_SRC_RDY of an output stays low when the word carries no frame for that output. The latency is one clock cycle.

Warning

An RX word is taken only once every output can accept it, so the slowest output stops all the others.

Generics

Generic	Type	Default	Description
SPLITTER_OUTPUTS	integer	8	Number of splitter outputs.
REGIONS	integer	4	Number of Regions in a word.
REGION_SIZE	integer	8	Number of Blocks in a Region.
BLOCK_SIZE	integer	8	Number of Items in a Block.
ITEM_WIDTH	integer	8	Width of one Item (in bits).
META_WIDTH	integer	1	Width of MFB metadata (in bits).
DEVICE	string	“AGILEX”	FPGA device name: ULTRASCALE, STRATIX10, AGILEX, …

Ports

Port	Type	Mode	Description
=====	Clock and Reset	=====	=====
CLK	std_logic	in
RESET	std_logic	in
=====	RX interface	=====	=====
RX_MFB_SEL	std_logic_vector(REGIONS*max(1,log2(SPLITTER_OUTPUTS))-1 downto 0)	in	One select bit for each stage (and for each region ofc), bit RX_MFB_SEL(0)(x) is for Stage 0, and so on. Expected to be valid with SOF!
RX_MFB_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	in
RX_MFB_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	in	Valid whenever, metadata is split by words
RX_MFB_SOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB_EOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	in
RX_MFB_EOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE*BLOCK_SIZE))-1 downto 0)	in
RX_MFB_SRC_RDY	std_logic	in
RX_MFB_DST_RDY	std_logic	out
=====	TX interface	=====	=====
TX_MFB_DATA	slv_array_t (SPLITTER_OUTPUTS-1 downto 0)(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	out
TX_MFB_META	slv_array_t (SPLITTER_OUTPUTS-1 downto 0)(REGIONS*META_WIDTH-1 downto 0)	out	Valid whenever, metadata is split by words
TX_MFB_SOF	slv_array_t (SPLITTER_OUTPUTS-1 downto 0)(REGIONS-1 downto 0)	out
TX_MFB_EOF	slv_array_t (SPLITTER_OUTPUTS-1 downto 0)(REGIONS-1 downto 0)	out
TX_MFB_SOF_POS	slv_array_t (SPLITTER_OUTPUTS-1 downto 0)(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	out
TX_MFB_EOF_POS	slv_array_t (SPLITTER_OUTPUTS-1 downto 0)(REGIONS*max(1,log2(REGION_SIZE*BLOCK_SIZE))-1 downto 0)	out
TX_MFB_SRC_RDY	std_logic_vector(SPLITTER_OUTPUTS-1 downto 0)	out
TX_MFB_DST_RDY	std_logic_vector(SPLITTER_OUTPUTS-1 downto 0)	in