Carrier-Class Ethernet Controller for Next Generation Telecom Networking (TXC-06880)


The Envoy™-CE2 is the next generation of powerful Ethernet to SPI-3 Controllers for carrier-class networks. The Envoy™-CE2 incorporates two configurable Media Access Controllers (MACs). Each MAC can be configured as a single Gigabit Ethernet (10/100/1000 Mbits/s) or dual Fast Ethernet with extended buffers or octal Fast Ethernet (10/100 Mbits/s) interface and is programmable for either full-duplex or half-duplex operation. This device extends the TranSwitch Envoy family and bridges the worlds of LAN and WAN with standard protocol interfaces. The Envoy™-CE2 supports Super Jumbo (12 KBytes) packets on both Fast Ethernet and Gigabit Ethernet interfaces.

The Envoy™-CE2 is designed to interface directly with SPI-3 compliant devices, such as network processors. The support for master mode on the SPI-3 allows glueless interface with standard SPI-3 based GFP/VCAT framers and mappers. On the Ethernet side, the Envoy™-CE2 interfaces directly with standard Fast Ethernet and Gigabit Ethernet PHY/SerDes devices via the SMII and GMII. The Envoy™-CE2 incorporates on-chip buffering to promote high performance without congestion or loss of data and provides backpressure support in both egress and ingress directions.


  • 580-lead plastic ball grid array (PBGA) package, 27 mm x 27 mm
  • IEEE 1149.1 JTAG support
  • 8/16 bit Intel/Motorola host processor interface, operating at 33/66 MHz
  • Port aggregation from Ethernet to SPI-3, using routing tag encapsulation
  • Filtering of PAUSE frames in Ethernet Ingress or Egress
  • Automatic PAUSE frame generation and termination
  • Programmable high and low FIFO watermarks for flow control trigger
  • "Raise Carrier" flow control for half duplex mode
  • PAUSE frame flow control for Full Duplex mode
  • Packet statistics and Performance monitoring support for RMON per port
  • Frame integrity verification (FCS and Frame length checks) and generation
  • Programmable SPI-3 burst size from 64 to 1024 bytes
  • Support for VLAN tagged frames
  • Full and Half Duplex (CSMA/CD) operation (Half Duplex only supported for Fast Ethernet)
  • Support for Jumbo frames (9600 Bytes) and Super Jumbo frames (12000 Bytes)
  • SPI-3 interface configurable in Link or PHY layer mode, operating at 125 MHz
  • Each MAC is configurable as 8 Fast Ethernet ports (10/100 Mbits/s) or 2 Fast Ethernet ports with extended buffers or 1 Gigabit Ethernet port (10/100/1000 Mbits/s)
  • 2 Configurable Media Access Controllers (MACs)

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