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MU9C8358L Datasheet(PDF) 2 Page - MUSIC Semiconductors |
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MU9C8358L Datasheet(HTML) 2 Page - MUSIC Semiconductors |
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2 / 32 page  08 &/ 4XDG 0E(WKHUQHW)LOWHU ,QWHUID.H *HQHUDO 'HV.ULSWLRQ 5HY *(1(5$/ '(6&5,37,21 The MU9C8358L, when configured with 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 multi-port systems that require a common address database for all ports. Built-in arbitration allows two MU9C8358L devices to share a common CAM database, supporting up to eight 100Mb/s Ethernet ports at wire speed. 23(5$7,21$/ 29(59,(: Because of the flexibility of the MU9C8358L, the best way to approach the feature set of the device is to first look at a typical Multiport 10/100Mb Ethernet application. The MU9C8358L 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. 7\SL.DO08 &/ $SSOL.DWLRQ The MU9C8358L plays an integral role in the example of an Ethernet switching system, shown in Figure 2. This system can handle up to 32,768 addresses distributed over eight independent, bidirectional 100Mb Ethernet ports by utilizing two MU9C8358L devices and four LANCAMs connected as shown in Figure 1. The system is based on several industry-standard and proprietary busses, which are described in more detail later. The MII bus is "tapped" to collect packet data as it passes from the PHY to the MAC. That data is processed automatically by the MU9C8358L/LANCAM combination. The LANCAM bus is utilized to transfer the DA and SA to the CAMs for comparisons, and to transfer the match results from the CAMs to the MU9C8358L. The results of MU9C8358L/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 per MII port to relay the Tag ID to the system for systems that support Tag switching. The Arbitration bus provides communication between two MU9C8358L devices to service eight MII ports with a shared CAM-based station list. When the DA is processed, the MU9C8358L 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. Unicast frames that are destined for a different collision domain (visible on a different switch port) are processed by the system. 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 are not processed by the system. Instead they are identified and their classification is stored in the Result register. 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. The built-in arbitration allows all ports equal access to the CAM database. The arbitration scheme gives DA processing the highest-priority, then SA processing. Address processing always has priority over management routines, such as purging aged entries, inserting permanent entries, deleting entries, or reading from the CAM database. Using the 70 ns speed grade CAMs and a 50 MHz system clock, there is sufficient time to support eight DA searches, eight SA searches, and one management routine, within the minimum frame time (about 6.2 µS). In addition, the arbitration bus allows the MU9C8358L to be used with future MUSIC devices, sharing a common CAM database. |
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