SoftUSB OHCI Full & Low-Speed USB Host Controller

SoftUSB OHCI Full & Low-Speed USB Host Controller


Category: Communication Controller

Created: August 05, 2010

Updated: January 27, 2020

Language: Verilog

Other project properties

Development Status: Alpha

Additional info: Specification done

WishBone compliant: Yes

WishBone version: n/a

License: GPL


SoftUSB is part of the Milkymist System-on-Chip, the most advanced open source SoC for interactive multimedia applications.

  • Supports full (12Mbps) and low (1.5Mbps) speed operation
  • Two downstream ports with shared bandwidth
  • Integrated PHY
  • Directly interfaces to common USB transceivers such as the MIC2550A
  • Hybrid architecture featuring the Navré AVR compatible processor (8-bit RISC) to implement the complex parts of OHCI in C software.
  • Two asynchronous clock domains: system clock and 48MHz USB
  • AVR program and OHCI descriptors and data are stored in shared (system addressable) on-chip dual-port RAM

,SoftUSB is work in progress, for the latest information or to contribute to the development please see the Milkymist-devel mailing list and the #milkymist channel on the Freenode IRC network. In particular, testers are wanted for the Navré softcore.,

More information