Intel® Agilex™ Hard Processor System Technical Reference Manual

ID 683567
Date 2/14/2023
Public

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18.5.1.2.1. Slave Interface CSR Unit

The slave interface can read from and write to all the CSRs in the USB OTG controllers. All register accesses are 32 bits.

The CSR is divided into the following groups of registers:

  • Global
  • Host
  • Device
  • Power and clock gating

Some registers are shared between host and device modes, because the controller can only be in one mode at a time. The controller generates a mode mismatch interrupt if a master attempts to access device registers when the controller is in host mode, or attempts to access host registers when the controller is in device mode. Writing to unimplemented registers is ignored. Reading from unimplemented registers returns indeterminate values.