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25-Gbps Ultra-Low Latency Ethernet MAC & PCS + RS-FEC
The 25G Ethernet MAC & PCS + RS-FEC is compliant with IEEE802.3by-2016 and 25/50G Ethernet Consortium specifications. The core is designed using advanced design techniques leading to unmatched ultra-low gate count utilization and great latency performances. It includes a rich set of standard and advanced features making it ideal for a large number of applications.
The IP core can support full wire line speed with a 64-byte packet length. It also supports back-to-back or mixed length traffic, up to jumbo frame size, with no dropped packets.
The core includes Reed Solomon FEC RS(528, 514, 10) with FEC bypass and error correction bypass capabilities. A second option of the IP core without RS-FEC is also available.
The IP core can support full wire line speed with a 64-byte packet length. It also supports back-to-back or mixed length traffic, up to jumbo frame size, with no dropped packets.
The core includes Reed Solomon FEC RS(528, 514, 10) with FEC bypass and error correction bypass capabilities. A second option of the IP core without RS-FEC is also available.
Features
- General Features
- Compliant with IEEE802.3by-2016 and 25/50G Ethernet Consortium
- Ethernet MAC supports 25GbE line rate with flexible feature set
- Soft PCS logic interfacing to standard serial transceiver at 25.78125Gbps
- MAC Features
- Deficit idle counter (DIC) to maintain a 12-byte inter-packet gap (IPG) average
- Programmable IPG length
- Programmable Maximum Receive Unit (MRU), Maximum Transmission Unit (MTU)
- User facing logic interface 64-bit @ ~402.8MHz
- Ethernet flow control and congestion management using pause frames with programmable quanta
- XON / XOFF Frame transmission can be triggered by host (software) interface or directly by core pause frame interface signals
- Programmable Tx minimum packet length with enable/disable padding option
- Programmable Rx minimum packet length
- Tx Frame Check Sequence (FCS) computation and insertion
- Programmable Tx FCS pass-through and corruption insertion modes
- Programmable keep/strip Rx FCS. Programmable Rx FCS error detection and marking
- Programmable Tx and Rx large frame threshold detection
- Programmable Tx and Rx path VLAN detection (Programmable TPID, stacked VLAN)
- Programmable Rx frame discard & marking
- Configurable statistics vector and collector on transmit and receive MAC data
- PCS Features
- Supports 25GBASE-R PHY based on 64B/66B encoding and scrambling
- Supports block synchronization and BER monitor
- Configurable statistics vector and collector on transmit and receive PCS
- RS-FEC Features
- Built-In Reed Solomon FEC RS(528, 514, 10) with FEC bypass and error correction bypass capabilities
- Pre-compilation setting to include or not RS-FEC option (MAC/PCS/PMA or MAC/PCS/PMA + RS-FEC)
- Statistics information for RS-FEC decoder (FEC align status, corrected & uncorrected FEC codewords)
Applications
- The Ultra-Low Latency Ethernet MAC & PCS IP cores are based on cut-through architecture and innovative FCS processing algorithms resulting in amazing latency performances. Typical applications where latency is critical:
- Data Centers and Computing
- High Frequency Trading
- Low Latency Switch
- Network Interface Card (NIC)
- HW Acceleration / Data Acquisition
- Data Mining
- Communication and Networking
- Packet Based Processing
- Core, Edge Routers
- Aggregation
- Backhaul and Access Solutions
- Line Card / Switch-Fabric Card
- Other Applications
- Ethernet Traffic Monitoring
- Test Equipment
- Low-Latency Ethernet Encryptors
Block Diagram of the 25-Gbps Ultra-Low Latency Ethernet MAC & PCS + RS-FEC
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