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MU9C8338A Datasheet(PDF) 2 Page - MUSIC Semiconductors |
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MU9C8338A Datasheet(HTML) 2 Page - MUSIC Semiconductors |
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2 / 32 page  MU9C8338A 10/100Mb Ethernet Filter Interface General Description 2Rev. 0a GENERAL DESCRIPTION The MU9C8338A, when configured with the MUSIC Semiconductors MU9Cx480B family of LANCAMs provides a high performance, large capacity Ethernet address processing subsystem for use in Ethernet bridge, switch, or remote access products. The device is designed to work in single-port system supporting a 100Mb/s Ethernet port at wire speed. OPERATIONAL OVERVIEW Because of the flexibility of the MU9C8338A, the best way to approach the feature set of the device is to first look at a typical 10/100Mb Ethernet application. The MU9C8338A captures the Destination address (DA) and the Source address (SA) of an incoming Ethernet frame on the MII port. After checking for a frame error or collision, the DA is processed and the result (associated data, usually a port ID) is made available. The SA then is checked, and either learned if new, or aged if already in the list. Typical MU9C8338A Application The MU9C8338A plays an integral role in the example of an Ethernet bridge system, shown in Figure 1. This system can handle up to 32,768 addresses on a bidirectional 100Mb Ethernet port by utilizing the MU9C8338A device and four LANCAMs connected as shown in Figure 1. The MII bus is "tapped" to collect packet data as it passes from the Ethernet PHY to the MAC. That data is processed automatically by the MU9C8338A/LANCAM combination. The MU9C8338A transfers the DA and SA to the CAMs for comparison. The results of MU9C8338A/LANCAM data processing are available through the Result bus or through the Processor bus. In addition to the Result bus, there is a serial Tag port for the MII port to relay the Tag ID to the system for systems that support Tag switching. When the DA is processed, the MU9C8338A first checks if the frame is Unicast, Multicast, or Broadcast. Unicast frames destined for the same collision domain (visible on the same switch port as it came in on) are rejected. If the DA is found in the CAM database, the port ID associated with it is stored in the Result register. Multicast and Broadcast frames may also be processed by the system if the MU9C8338A is configured to do so. When Multicast is enabled, a default action is configured which causes frames with unknown group addresses to be processed correctly. Once processing completes, the Result register is accessed through the Result port or Processor port. Provided the frame length is correct, and no errors are detected, the SA is processed. If the SA exists in the CAM database, the time stamp and Port ID are updated. If the SA is not found in the CAM database, the address is learned automatically, along with its Port ID and the current time stamp information. Address processing always has priority over management routines, such as purging aged entries, inserting permanent entries, deleting entries, or reading from the CAM database. |
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