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

pg074_user_k_port_interface.jpg

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

pg074_big_endian_user_k_format.jpg

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

pg074_little_endian_user_k_format.jpg