Providing the Command Field In-Line - 7.2 English

AXI 1G/2.5G Ethernet Subsystem Product Guide (PG138)
Document ID
PG138
Release Date
2023-11-15
Version
7.2 English

The Command Field can optionally be provided in-line with the frame sent for transmission using the TEMAC existing AXI4-Stream Interface – Transmit (see the Tri-Mode Ethernet MAC LogiCORE IP Product Guide (PG051).

Enabling this mode is through an AXI4-Lite addressable configuration bit (see Table 2, bit 22).

When enabled, the 64-bit Command Field is passed to the Ethernet MAC immediately before the start of the frame (in place of the Preamble field). See the following figure.

Figure 1. Timing Diagram of the In-Line Command Field and Frame Data for Transmission AXI Ethernet Page-1 Sheet.2 Sheet.3 Sheet.4 Sheet.5 Sheet.6 Sheet.7 Sheet.8 Sheet.9 Sheet.10 Sheet.11 Sheet.12 Sheet.13 Sheet.14 Sheet.15 Sheet.16 Sheet.17 Sheet.18 Sheet.19 Sheet.20 Sheet.21 Sheet.22 Sheet.23 Sheet.24 Sheet.25 Sheet.26 Sheet.27 Sheet.28 tx_mac_aclk tx_mac_aclk Sheet.29 Sheet.30 Sheet.31 Sheet.32 Sheet.33 Sheet.34 Sheet.35 Sheet.36 Sheet.37 Sheet.38 [63:56] [63:56] Sheet.39 Sheet.40 Sheet.41 Sheet.42 Sheet.43 Sheet.44 Sheet.45 Sheet.46 Sheet.47 Sheet.48 Sheet.49 Sheet.50 Sheet.51 Sheet.52 Sheet.53 Sheet.54 Sheet.55 tx_axis_mac_tdata tx_axis_mac_tdata Bracket.284 Bracket.104 Sheet.58 Sheet.59 Sheet.60 TX Command Field TX Command Field Sheet.61 Sheet.62 Sheet.63 Sheet.64 Sheet.65 Sheet.66 Sheet.67 idle idle Bracket.75 Sheet.69 [55:48] [55:48] Sheet.70 [47:40] [47:40] Sheet.71 [39:32] [39:32] Sheet.72 [31:24] [31:24] Sheet.73 [23:16] [23:16] Sheet.74 [15:8] [15:8] Sheet.75 [7:0] [7:0] Sheet.76 Destination Address Destination Address Sheet.77 Sheet.78 Sheet.79 Sheet.80 Sheet.81 Sheet.82 Sheet.83 Sheet.84 Sheet.85 Sheet.86 tx_axis_mac_tvalid tx_axis_mac_tvalid Sheet.87 tx_axis_mac_tlast tx_axis_mac_tlast Sheet.88 tx_axis_mac_tuser tx_axis_mac_tuser Sheet.89 tx_axis_mac_tready tx_axis_mac_tready Sheet.90 Sheet.91 Sheet.92 X15630-100818 X15630-100818

When this in-line Command Field mode is not enabled, the AXI4-Stream Interface – Transmit is unchanged from the current operation, and the Out Of Band Command Field method described previously must be used instead.