Bay | Cypress Semiconductor


This product is Not Recommended For New Designs (NRND). Cypress recommends using the EZ-USB FX3S family instead.

The Cypress's West Bridge® Bay™ peripheral controller is the successor to the A-generation West Bridge, offering faster storage access to USB 2.0 with additional Hi-Speed USB On-The-Go (OTG) capability. Bay incorporates the enhanced SLIM® II architecture, providing uninterrupted and simultaneous data flow among processor, storage, and USB. With the support for the latest SD 3.0 (SDXC with UHS-I) and eMMC 4.41 standards, Bay provides improved storage performance to enhance user experience.

West Bridge Bay Block Diagram

Key Features

  • Integration: Hi-Speed USB 2.0 Peripheral Controller with On-The-Go (OTG) capability
  • High-Performance: ARM9 with 512 kB RAM for data processing
  • SLIM®II Architecture: Simultaneous access for all ports, enabling multitasking without performance degradation
  • Improved User Experience: Built-in RAID-0 configuration for improved read/write access to flash storage
  • Next-generation Storage Support: SD 3.0 (with UHS-I), eMMC 4.41
  • Integrated Hi-Speed USB 2.0 Switch
  • EZ-Dtect™: Charging and accessory detection
  • Flexible Input: 19.2 MHz XTAL and selectable clock input from 19.2, 26, 38.4, and 52 MHz
  • Small Footprint: 131-ball WLCSP package


  • Servers
  • Mobile Handsets
  • Tablet PCs
  • Storage Expansion
  • Personal Media Players
  • Digital Video Cameras
  • Digital Still Cameras
  • Portable Gaming Consoles