10/100 Ethernet MAC and PHY

 

Part Number	Replacement	Explanation

Description

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The 78Q8430 is a 10/100 Fast Ethernet controller supporting multimedia offload, optimized for host processor offload and throughput enhancements for demanding multimedia applications found in set-top boxes, IP video, and broadband media appliance applications. The 78Q8430 seamlessly interfaces to non-PCI processors through a simplified pseudo-SRAM-like host bus interface supporting 32/16/8-bit data bus widths and provides support for IEEE 802.3x flow control and compliance with IEEE 802.3 and 802.3u standards.

Supporting 10BASE-T and 100BASE-TX, the transceiver provides auto MDI-X cable crossover correction, autonegotiation, link configuration, and full/half-duplex support with full-duplex flow control and requires only a dual 1:1 isolation transformer for line interfacing. Incorporating numerous packet processing and IP address resolution control functions, in addition to an extensive set of error monitoring, reporting and troubleshooting features, the 78Q8430 provides optimal 10/100 Ethernet connectivity in demanding video streaming and mixed-media applications.

Key Features

• Single-Chip 10/100 Fast Ethernet Integrated PHY and MAC
• 32kB SRAM FIFO Memory
  • Adaptive Memory Allocation Between Tx and Rx Paths
  • Queue Independent User-Settable "Watermarks"
  • Per Queue Status Indication
• Address Resolution Controller (ARC)
  • Multiple Perfect Address Filtering—Eight Default (Max 12)
  • "Wildcard" Address Filtering, Individual, Multicast, and Broadcast Address Recognition and Filtering
  • Positive/Negative Filtering and Promiscuous Mode
• 64kB JUMBO Packet Support
• QoS—Four Transmit Priority Levels
• Non-PCI Pseudo-SRAM Host Bus Interface
  • 8b, 16b, 32b Bus Width
  • Big/Little-Endian Support for 16b/32b Bus Widths
  • Asynchronous (100MHz) and Synchronous (50MHz) Bus Clock Support
• Low Power and Flexible Power-Supply Management
  • Power-Down/Save, Wake-On LAN (Magic Packet, ON Now Packet), Link Status Change
  • Traffic Offload Engine Functionality
    • Transfer Frame—ARP and ICMP Echo
    • IP Firewall Configuration—Drop Frames on Source IP Address
    • IP Checksum

Applications/Uses

• Digital Video Recorders/Players
• High-Definition 1080p/1080i DTVs
• High-Performance Satellite, Cable, and IPTV Set-Top Boxes
• IP-PVR and Video Distribution Systems
• Multimedia Residential Gateways
• Routers and IADs