CPU Interface - 1.2 English

HDMI 2.1 Transmitter Subsystem Product Guide (PG350)

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1.2 English

The CPU interface is an AXI4-Lite bus interface, which is connected to a processor (Zynq UltraScale+ MPSoC processor or MicroBlaze™ ™). Multiple sub-modules are used to construct the HDMI 2.1 TX Subsystem and all the sub-modules which require software access are connected through an AXI crossbar. Therefore, the processor can access and control each individual sub-module inside the HDMI 2.1 TX Subsystem.

The following table shows the AXI4-Lite control interface signals. This interface is an AXI4-Lite interface and runs at the s_axi_cpu_aclk clock rate. Control of the subsystem is only supported through the subsystem driver.

Important: Direct register level access to any of the sub-modules is not supported. Instead, all accesses are done through the HDMI 2.1 TX Subsystem driver APIs. This AXI4-Lite slave interface supports single beat read and write data transfers, but no burst transfers.
Table 1. CPU Interface Ports
Name I/O Width Description
s_axi_cpu_aresetn I 1 Reset (Active-Low)
s_axi_cpu_aclk I 1 Clock for AXI4-Lite control interface
S_AXI_CPU_IN_awaddr I 17 or 19 Write address
S_AXI_CPU_IN_awprot I 3 Write address protection
S_AXI_CPU_IN_awvalid I 1 Write address valid
S_AXI_CPU_IN_awready O 1 Write address ready
S_AXI_CPU_IN_wdata I 32 Write data
S_AXI_CPU_IN_wstrb I 4 Write data strobe
S_AXI_CPU_IN_wvalid I 1 Write data valid
S_AXI_CPU_IN_wready O 1 Write data ready
S_AXI_CPU_IN_bresp O 2 Write response
S_AXI_CPU_IN_bvalid O 1 Write response valid
S_AXI_CPU_IN_bready I 1 Write response ready
S_AXI_CPU_IN_araddr I 17 or 19 Read address
S_AXI_CPU_IN_arprot I 3 Read address protection
S_AXI_CPU_IN_arvalid I 1 Read address valid
S_AXI_CPU_IN_aready O 1 Read address ready
S_AXI_CPU_IN_rdata O 32 Read data
S_AXI_CPU_IN_rresp O 2 Read data response
S_AXI_CPU_IN_rvalid O 1 Read data valid
S_AXI_CPU_IN_rready I 1 Read data ready
  1. Data width for port S_AXI_CPU_IN_araddr and S_AXI_CPU_IN_awaddr has two possible values.
    • 17: When HDCP is disabled in hardware through the HDMI 2.1 TX Subsystem GUI.
    • 19: When HDCP is enabled in hardware through the HDMI 2.1 TX Subsystem GUI.