Features: • The highest level of silicon integration achieved for a eightport 10/100 Ethernet switch device
• Fourth generation switch on a chip
• The BCM5328M integrates:
• Eight transceivers (802.3u compliant)
• Nine media access controllers (802.x compliant)
• 256-KB packet buffer
• Non-blocking switch fabric
• Non-blocking up to 24 ports through a 2.6-Gbps expansion port, cascading up to three devices
• Packet classification 802.1p QoS priority queues
• Port-based VLAN
• MII or 7-wire interface supports an additional 100FX or 100TX connection enabling a sixth user connection
oruplink
• Supports up to 4K MAC addresses
• Supports full-duplex (802.3x) and half-duplex options
• Supports automatic address learning and aging
• Internal oscillator circuit
• Typical power consumption: < 1.8W
• 208-pin PQFP package
• Management features:
• Low-cost MIB AutocastTM function
• Hardware support for Simple Network Management Protocol (SNMP), Remote Network Monitoring (RMON)
and SpanningDescriptionThe Broadcom BCM5328M device is a highly integrated solution. BCM5328M combines all the functions of a high-speed switch system-including packet buffer, PHY transceivers, media access controllers, address management, and a non-blocking switch fabric-into a single 0.18µ CMOS device. BCM5328M complies with the IEEE 802.3, 802.3µ, and 802.3x specifications, including the MAC control PAUSE frame and autonegotiation subsections, providing compatibility with all industry-standard Ethernet and Fast Ethernet devices.
BCM5328M contains eight full-duplex 10BASE-T/100BASE-TX Fast Ethernet transceivers, each of which performs all of the physical layer interface functions for 10BASE-T Ethernet on Category 3, 4, or 5 Unshielded Twisted Pair (UTP) cable and 100BASE-TX Fast Ethernet on Category 5 UTP cable.
SPI or E2PROM interfaces provide easy programming of the 802.1p QoS queues. BCM5328M allows switch traffic to be given different classes of priority or service, for example, voice traffic for IP phone applications, video traffic for multimedia applications, or data traffic for e-mail applications.
Even though BCM5328M is primarily targeted for the cost-sensitive unmanaged market, very low-cost management can also be provided utilizing the proprietary MIB Autocast™ function. MIB Autocast encapsulates the on-chip MIB statistics and sends them out automatically on a predefined port (or ports) at programmed intervals. This feature eliminates the need for a costly CPU and simplifies the management interface.
Using this mode, the BCM5328M periodically transmits a legal Ethernet frame on a designated port. The frames can be intercepted by an external management probe or a dedicated network management application, resident on any node within the network. This function requires only a small, low-cost microcontroller to initialize and configure the device.
The BCM5328M provides an on-chip MIB statistics register to collect, receive, and transmit statistics for each port. Additionally BCM5328M provides direct hardware support for the EtherLike MIB, Bridge MIB, MIB II (interfaces) and the first four groups of the RMON MIB. All nine groups of RMON can be supported by using additional capabilities, such as port mirroring/ snooping, together with an external microcontroller to process some MIB attributes. The MIB registers can be accessed through the serial management port by an external microcontroller.
BCM5328M Data Sheet
