CT25210

The CT25210 Topology Discovery (TD) IP coordinates all operations required to perform 10BASE-T1S topology discovery measurements. It integrates several functional blocks, each responsible for a specific phase of configuration, training, measurement, and signal handling within the discovery process. At the top level, the TD Manager supervises the measurement flow and configuration setup. Within this block, the TD Mode Manager manages the receive-only operating mode and distributes the necessary clock signals to other TD modules.

The PMD Configurator handles the transition of the Physical Medium Dependent (PMD) layer into and out of Topology Discovery mode, managing the sequence of configuration steps required for proper synchronization with the PHY. Measurement execution is distributed between the Delay Measurement Manager which performs internal delay and distance measurement protocols, respectively. Signal generation and acquisition are handled by the TD Pulse Manager, which initiates and transmits the TD_Pulse onto the line, and by the TX and RX Drivers. The TX Driver routes the generated signals to the transceiver’s TX pin and verifies the correctness of the pulse duration, while the RX Driver performs descrambling and manages both Energy Detect (ED) and RX signal handling during discovery operations. Inter-module communication is managed by the Routing Driver. Finally, the DLY Line block introduces a controlled delay between the detected ED event and the subsequent TX response. This delay ensures timing alignment and protocol compliance as defined by the OPEN Alliance 10BASE-T1S Topology Discovery specification (V1.0).

Features

• Compliant to:
  • IEEE 802.3cg® specifications
  • OPEN Alliance TC14 10BASE-T1S PMD Transceiver Interface
  • OPEN Alliance TC14 10BASE-T1S Advanced diagnostic features
  • OPEN Alliance TC14 10BASE-T1S Topology Discovery
  • OPEN Alliance System Implementation
  • OPEN Alliance TC14 IEEE 10BASE-T1S EMC Test Specification for Transceivers