USER-K Block Interface - 12.0 English

PG074 Aurora 64B/66B LogiCORE IP Product Guide

Document ID

PG074

Release Date

2022-10-19

Version

12.0 English

This Figure shows the USER-K interface ports for a single-lane design with the USER-K interface enabled.

Figure 2-26: USER-K Port Interface
X-Ref Target - Figure 2-26

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.

Table 2-10: 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= {{4'h0,user_k_blk_no[0:3],user_k_data[55:0]}n} Little endian format: m_axi_rx_user_k_tdata= {{user_k_data[55:0],4'h0,user_k_blk_no[3:0]}n}.
Notes: 1. n is the number of lanes.

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.

Table 2-11: USER-K Block Valid Block Type Field (BTF) Values
USER-K Block Number	USER-K Block BTF
USER-K Block 0	0xD2
USER-K Block 1	0x99
USER-K Block 2	0x55
USER-K Block 3	0xB4
USER-K Block 4	0xCC
USER-K Block 5	0x66
USER-K Block 6	0x33
USER-K Block 7	0x4B
USER-K Block 8	0x87

This Figure shows the USER-K format in default (big-endian) mode.

Figure 2-27: USER-K Format in Default Mode
X-Ref Target - Figure 2-27

This Figure shows the USER-K format in little-endian mode.

Figure 2-28: USER-K Format in Little-Endian Mode
X-Ref Target - Figure 2-28