The AXI4-Lite
interface allows you to dynamically control parameters within the core. The configuration
can be accomplished using an AXI4-Lite master state machine, an
embedded
Arm®
, or soft system processor such as AMD
MicroBlaze™
. The Video Mixer can be controlled through the AXI4-Lite interface by using
functions provided by the driver in the AMD Vitis™
tools.
Another method is performing read and write transactions to the register space but should
only be used when the first method is not available. The following table shows the AXI4-Lite control interface signals. This interface runs at the
ap_clk clock.
| Signal Name | I/O | Width | Description |
|---|---|---|---|
| s_axi_ctrl_aresetn | I | 1 | Reset |
| s_axi_ctrl_aclk | I | 1 | Clock |
| s_axi_ctrl_awaddr | I | 18 | Write Address |
| s_axi_ctrl_awprot | I | 3 | Write Address Protection |
| s_axi_ctrl_awvalid | I | 1 | Write Address Valid |
| s_axi_ctrl_awready | O | 1 | Write Address Ready |
| s_axi_ctrl_wdata | I | 32 | Write Data |
| s_axi_ctrl_wstrb | I | 4 | Write Data Strobe |
| s_axi_ctrl_wvalid | I | 1 | Write Data Valid |
| s_axi_ctrl_wready | O | 1 | Write Data Ready |
| s_axi_ctrl_bresp | O | 2 | Write Response |
| s_axi_ctrl_bvalid | O | 1 | Write Response Valid |
| s_axi_ctrl_bready | I | 1 | Write Response Ready |
| s_axi_ctrl_araddr | I | 18 | Read Address |
| s_axi_ctrl_arprot | I | 3 | Read Address Protection |
| s_axi_ctrl_arvalid | I | 1 | Read Address Valid |
| s_axi_ctrl_aready | O | 1 | Read Address Ready |
| s_axi_ctrl_rdata | O | 32 | Read Data |
| s_axi_ctrl_rresp | O | 2 | Read Data Response |
| s_axi_ctrl_rvalid | O | 1 | Read Data Valid |
| s_axi_ctrl_rready | I | 1 | Read Data Ready |