A.3.2. Write data channel signals

Table A.4 shows the AXI write data channel signals. Unless the description indicates otherwise, these signals are used by AXI3 and AXI4 protocols. For more information on each signal, see the ARM® AMBA® AXI and ACE Protocol Specification.

Table A.4. Write data channel signals

AXI signal NIC-400 adaptation[a]SourceDescription

Write address ID.

Where n is a variable:

  • For an ASIB, ID width {0-16} where 0 indicates that no value has been selected.

  • For an AMIB, one of the following parameters:

    • Global ID width {1-24}.

    • ID reduction. If selected, then the values can be viewed in the AMIBs ID reduction report from the GUI.


This signal is not present in AXI4.


Write data.


n is equal to data width -1.

Data widths can be 32, 64, 128, or 256 bits.


Write strobes

When HIGH, specify the byte lanes of the data bus that contain valid information. There is one write strobe for each eight bits of the write data bus, therefore wstrb[n] corresponds to wdata[(8n)+7: (8n)].

wlast_x[b]MasterWrite last.

User defined signal.


n is equal to user defined width -1.

A user defined width is in the range of 0-256 bits.

If 0 is selected then the signal is not used.

wvalid_x[b]MasterWrite valid.
wready_x[b]SlaveWrite ready.

[a] You can select uppercase or lowercase signal names from the GUI.

[b] Where x is:


For a bridge slave interface.


For a bridge master interface.


For a system slave interface or master interface.

Copyright © 2012-2014 ARM. All rights reserved.ARM DDI 0475E