Intel® Agilex™ Hard Processor System Technical Reference Manual

ID 683567
Date 11/11/2022
Public

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18.2. Block Diagram and System Integration

Figure 80. USB OTG Controller System Integration

Two subsystems are included in the HPS.

The USB OTG controller connects to the layer 3 (L3) interconnect through an L4 slave bus interface, allowing other masters to access the control and status registers (CSRs) in the controller. The controller also connects to the L3 interconnect through the I/O translation buffer unit (TBU), allowing the DMA engine in the controller to move data between external memory and the controller.

A single-port RAM (SPRAM) connected to the USB OTG controller is used to store USB data packets for both host and device modes. It is configured as FIFO buffers for receive and transmit data packets on the USB link.

Through the system manager, the USB OTG controller has control to use and test error correction codes (ECCs) in the SPRAM. Through the system manager, the USB OTG controller can also control the behavior of the master interface to the L3 interconnect.

The USB OTG controller connects to the external USB transceiver through a ULPI PHY interface. This interface also connects through pin multiplexers within the HPS. The pin multiplexers are controlled by the system manager.

Additional connections on the USB OTG controller include:

  • Clock input from the clock manager to the USB OTG controller
  • Reset input from the reset manager to the USB OTG controller
  • Interrupt line from the USB OTG controller to the microprocessor unit (MPU) global interrupt controller (GIC).

The USB Controller signals are routed to the dedicated HPS pins.