AXI4-Lite Ports - 2.7 English

1G/10G/25G Switching Ethernet Subsystem Product Guide (PG292)

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2.7 English

The following table describes the port list for the AXI processor interface.

Table 1. AXI Ports
Signal I/O Description
s_axi_aclk I AXI4-Lite clock. Range between 10 MHz and 300 MHz
s_axi_aresetn I Asynchronous active-Low reset
s_axi_awaddr[31:0] I Write address Bus
s_axi_awvalid I Write address valid
s_axi_awready O Write address acknowledge
s_axi_wdata[31:0] I Write data bus
s_axi_wstrb[3:0] I Strobe signal for the data bus byte lane
s_axi_wvalid O Write data valid
s_axi_wready O Write data acknowledge
s_axi_bresp[1:0] O Write transaction response
s_axi_bvalid O Write response valid
s_axi_bready I Write response acknowledge
s_axi_araddr[31:0] I Read address bus
s_axi_arvalid I Read address valid
s_axi_arready O Read address acknowledge
s_axi_rdata[31:0] O Read data output
s_axi_rresp[1:0] O Read data response
s_axi_rvalid O Read data/response valid
s_axi_rready I Read data acknowledge
pm_tick I Top level signal to read statistics counters; requires MODE_REG[30] (i.e., tick_reg_mode_sel) be set to 0.

Additional information for the operation of the AXI4 bus is found in Arm AMBA AXI Protocol v2.0 Specification (Arm IHI 0022C).

As noted previously, the top level signal pm_tick can be used to read statistics counters instead of the configuration register, TICK_REG. In this case, configuration register MODE_REG bit 30 (i.e., tick_reg_mode_sel) should be set to 0. If tick_reg_mode_sel set to 1, tick_reg is used to read the statistics counters.