This Figure shows the USER-K interface ports for a single-lane design with the USER-K interface enabled.
USER-K blocks are special, single-block codes that include control blocks passed directly to the user application without being decoded by the Aurora 64B/66B interface. These blocks can be used to implement application-specific control functions and have a lower priority than UFC blocks but higher than user data blocks.
Table: USER-K Interface Ports lists the USER-K interface ports.
Name |
Direction |
Clock Domain |
Description |
---|---|---|---|
USER_K_S_AXIS_TX |
|||
s_axi_user_k_tx_tdata[0:(64 n –1)] or s_axi_user_k_tx_tdata[(64 n –1):0] (1) |
Input |
user_clk |
USER-K block data is 64-bit aligned. Signal Mapping per lane: Default: s_axi_user_k_tx_tdata={{4'h0,user_k_blk_no[0:3],user_k_data[55:0]}*n} Little endian format: s_axi_user_k_tx_tdata={{user_k_data[55:0],4'h0,user_k_blk_no[3:0]}*n}. |
s_axi_user_k_tx_tvalid |
Input |
user_clk |
Indicates valid User-K data on the s_axi_user_k_tx_tdata port. |
s_axi_user_k_tx_tready |
Output |
user_clk |
Indicates the Aurora 64B/66B core is ready to accept data on the s_axi_user_k_tx_tdata interface. |
USER_K_M_AXIS_RX |
|||
m_axi_rx_user_k_tvalid |
Output |
user_clk |
Indicates valid User-K data on the m_axi_user_k_tx_tdata port. |
m_axi_rx_user_k_tdata or m_axi_rx_user_k_tdata[(64 n –1):0] (1) |
Output |
user_clk |
Received USER-K blocks from the Aurora 64B/66B lane are 64-bit aligned. Signal Mapping per lane: Default:
m_axi_rx_user_k_tdata=
Little endian format:
m_axi_rx_user_k_tdata=
|
Notes: |
The USER-K block is not differentiated for streaming or framing designs. Each USER-K block is eight-bytes wide and is encoded with a USER-K BTF value as specified in Table: USER-K Block Valid Block Type Field (BTF) Values . The BTF value is indicated by the user application in the s_axi_user_k_tx_tdata port as a USER-K block number. The USER-K block is a single block code and is always delineated by a USER-K block number. Provide the USER-K block number as specified in This Figure and This Figure . The USER-K block data is limited to the specified seven bytes of the s_axi_user_k_tx_tdata port.
This Figure shows the USER-K format in default (big-endian) mode.
This Figure shows the USER-K format in little-endian mode.