Common Public Radio Interface - IP Core

Features

• Supports the physical link layer (Layer 1) of the CPRI specification
• Supports five standard bit rates of the CPRI specification
  • 614.4 Mbps
  • 1228.8 Mbps
  • 2457.6 Mbps
  • 3072 Mbps
  • 4915.2 Mbps
• Supports 8b/10b encoding/decoding performed in the PCS/SERDES
• Supports code-violation detection performed in the PCS/SERDES
• Performs CPRI Hyperframe Framing
  • Performs interleaving of IQ data, sync, C&M data, and vendor specific information
  • Provides an 8-, 16-, or 32-bit parallel interface for IQ data
• Performs subchannel mapping:
  • Supports a slow C&M channel based on a serial HDLC interface at standard bit rates (240 Kbps, 480 Kbps,960 Kbps, and 1920 Kbps). The HDLC framer, if needed, must be provided as a separate IP core.
  • Supports a fast C&M channel based on a serial Ethernet interface (84.48 Mbps max.) to the user logic, anon-standard rate MII Ethernet interface to a MAC, or a 100 Mbps MII interface to a PHY device. Accepts a user-selected pointer to the CPRI subchannel where the Ethernet link starts. The Ethernet MAC function isprovided as a separate IP core.

• Performs synchronization and timing as defined in section 4.2.8 of the CPRI Specification
• Supports the L1 Inband Protocol
• Provides a parallel interface for merging vendor specific data into the CPRI frame
• Provides a start-up sequence state machine in hardware for both REC and RE nodes which performs:
  • Synchronization and Rate Negotiation
  • C&M Plane setup

• Performs Link Maintenance as defined in section 4.2.10 of the CPRI Specification:
  • LOS detection
  • LOF detection
  • RAI indication
• Optional top-level template that implements user registers for control and status management
• Optional 8-bit register interface through the JTAG port