MFB Merger Simple

ENTITY MFB_MERGER_SIMPLE IS

This component merges two MFB streams into a single one. It starts merging from Input 0. After CNT_MAX clock cycles, it tries to switch to the other input. If there are no valid data on the other input, it stays on the current one and waits for the same number of clock cycles before checking again.

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.
MASKING_EN	boolean	True	Enable masking SOF and EOF due to switch to the other input.
CNT_MAX	integer	64	Maximum amount of clock periods with destination ready before it tries to switch to the other input.

Ports

Port	Type	Mode	Description
=====	Clock and Reset	=====	=====
CLK	std_logic	in
RST	std_logic	in
=====	RX interface 0	=====	=====
RX_MFB0_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	in
RX_MFB0_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	in
RX_MFB0_SOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB0_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	in
RX_MFB0_EOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB0_EOF_POS	std_logic_vector(REGIONS*log2(REGION_SIZE*BLOCK_SIZE)-1 downto 0)	in
RX_MFB0_SRC_RDY	std_logic	in
RX_MFB0_DST_RDY	std_logic	out
=====	RX interface 1	=====	=====
RX_MFB1_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	in
RX_MFB1_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	in
RX_MFB1_SOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB1_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	in
RX_MFB1_EOF	std_logic_vector(REGIONS-1 downto 0)	in
RX_MFB1_EOF_POS	std_logic_vector(REGIONS*log2(REGION_SIZE*BLOCK_SIZE)-1 downto 0)	in
RX_MFB1_SRC_RDY	std_logic	in
RX_MFB1_DST_RDY	std_logic	out
=====	TX interface	=====	=====
TX_MFB_DATA	std_logic_vector(REGIONS*REGION_SIZE*BLOCK_SIZE*ITEM_WIDTH-1 downto 0)	out
TX_MFB_META	std_logic_vector(REGIONS*META_WIDTH-1 downto 0)	out
TX_MFB_SOF	std_logic_vector(REGIONS-1 downto 0)	out
TX_MFB_SOF_POS	std_logic_vector(REGIONS*max(1,log2(REGION_SIZE))-1 downto 0)	out
TX_MFB_EOF	std_logic_vector(REGIONS-1 downto 0)	out
TX_MFB_EOF_POS	std_logic_vector(REGIONS*log2(REGION_SIZE*BLOCK_SIZE)-1 downto 0)	out
TX_MFB_SRC_RDY	std_logic	out
TX_MFB_DST_RDY	std_logic	in

MFB Merger Simple GEN

ENTITY MFB_MERGER_SIMPLE_GEN IS

This is a generic implementation of the MFB Merger when the number of input interfaces can be set to arbitrary large number.

Generics

Generic	Type	Default	Description
MERGER_INPUTS	natural	2	number of independent input MFB interfaces, should be the power of two
MFB_REGIONS	natural	2	MFB parameters
MFB_REGION_SIZE	natural	8
MFB_BLOCK_SIZE	natural	8
MFB_ITEM_WIDTH	natural	8
MFB_META_WIDTH	natural	8
MASKING_EN	boolean	TRUE	Enable masking SOF and EOF due to switch to the other input.
CNT_MAX	integer	64	Maximum amount of clock periods with destination ready before it tries to switch to the other input.

Ports

Port	Type	Mode	Description
=====	Clock and Reset	=====	=====
CLK	std_logic	in
RST	std_logic	in
=====	Multiple input RX MFB interfaces	=====	=====
RX_MFB_DATA	slv_array_t(MERGER_INPUTS -1 downto 0)(MFB_REGIONS*MFB_REGION_SIZE*MFB_BLOCK_SIZE*MFB_ITEM_WIDTH-1 downto 0)	in
RX_MFB_META	slv_array_t(MERGER_INPUTS -1 downto 0)(MFB_REGIONS*MFB_META_WIDTH-1 downto 0)	in
RX_MFB_SOF	slv_array_t(MERGER_INPUTS -1 downto 0)(MFB_REGIONS-1 downto 0)	in
RX_MFB_EOF	slv_array_t(MERGER_INPUTS -1 downto 0)(MFB_REGIONS-1 downto 0)	in
RX_MFB_SOF_POS	slv_array_t(MERGER_INPUTS -1 downto 0)(MFB_REGIONS*max(1, log2(MFB_REGION_SIZE))-1 downto 0)	in
RX_MFB_EOF_POS	slv_array_t(MERGER_INPUTS -1 downto 0)(MFB_REGIONS*log2(MFB_REGION_SIZE*MFB_BLOCK_SIZE)-1 downto 0)	in
RX_MFB_SRC_RDY	std_logic_vector(MERGER_INPUTS -1 downto 0)	in
RX_MFB_DST_RDY	std_logic_vector(MERGER_INPUTS -1 downto 0)	out
=====	Single output TX interface	=====	=====
TX_MFB_DATA	std_logic_vector(MFB_REGIONS*MFB_REGION_SIZE*MFB_BLOCK_SIZE*MFB_ITEM_WIDTH-1 downto 0)	out
TX_MFB_META	std_logic_vector(MFB_REGIONS*MFB_META_WIDTH-1 downto 0)	out
TX_MFB_SOF	std_logic_vector(MFB_REGIONS-1 downto 0)	out
TX_MFB_EOF	std_logic_vector(MFB_REGIONS-1 downto 0)	out
TX_MFB_SOF_POS	std_logic_vector(MFB_REGIONS*max(1, log2(MFB_REGION_SIZE))-1 downto 0)	out
TX_MFB_EOF_POS	std_logic_vector(MFB_REGIONS*log2(MFB_REGION_SIZE*MFB_BLOCK_SIZE)-1 downto 0)	out
TX_MFB_SRC_RDY	std_logic	out
TX_MFB_DST_RDY	std_logic	in