9-port 10/100 Switch Integrating the MACs, Switching

9-port 10/100 Switch Integrating the MACs, Switching
BCM5308
PRODUCT
Brief
BCM5308 INTEGRATED 10/100BASE-T 9-PORT SWITCH
B C M 5 3 0 8
F E AT U R E S
• 9-port 10/100 Switch Integrating the MACs, Switching
Fabric and 8 transceivers into a single chip
• Supports full-wire speed, full-duplex traffic on every
port simultaneously
• Cascadable up to 24 ports, non-blocking up to 16
ports
• Glueless interface to low-cost 512k bytes or 1M bytes
S U M M A R Y
• MII connection for external Phy
• 2 Gb/s expansion port cascades up to 3 devices in a
daisy chain configuration
B E N E F I T S
• World’s most integrated 10/100 switch
• Lowest cost solution
• Smallest form factor (reduces board space by 50%)
• Lowest power per port
• Scalable architecture supports 8 to 24 port densities
• Ninth port supports any external Ethernet MII
transceiver
SSRAM
• 4.2 Gb/s memory bandwidth provided per device
• Automatic Layer 2 address learning
• Dual mode expansion port
O F
• Plug and play solution
• No external CPU or EEPROM required
• Eliminates cost of external LED latches and drivers
• Robust and field-proven Digi-Φ™ based 10/100
transceivers
• Substantially simplifies board and system design
Supports up to 16k unicast MAC addresses
• Integrated transceivers eliminate pin-intensive Media
options
• Internal PLL generates all system clocks from a single
•
• Flow control: full-duplex (802.3x) and half-duplex
Independent Interface (MII)
25 MHz source
• Convertible port supports 100BASE-FX or TX
connections
• Pin configurable options
• Direct LED interface provides status on each port
• Low-power 3.3V design
• 352-pin TBGA package
Complete 8-Port 10/100 Switch Functional Block Diagram
L
E
D
M
a
t
r
i
x
SSRAM
64
Quad
Magnetics
8 x RJ-45
BCM5308
Quad
Magnetics
B C M 5 3 0 8
MDI
10/100 PHY
MAC
MDI
10/100 PHY
MAC
MDI
10/100 PHY
MAC
MDI
10/100 PHY
MAC
MDI
10/100 PHY
MAC
MDI
10/100 PHY
MAC
MDI
10/100 PHY
MAC
MDI
10/100 PHY
MAC
MII/EXPANSION
MAC
Broadcom’s® BCM5308 is a single chip 9-port 10/100BASE-T
switch device. The device integrates eight 10/100 autonegotiating transceivers, nine Media Access Controllers (MACs),
an address management engine and a non-blocking switch
controller. The ninth port of the device can be configured as an
MII port, or as a high speed expansion bus for cascading up to
three BCM5308 devices together, allowing for higher port
density solutions. The device interfaces directly to low cost
SSRAM for packet and address table memory.
The integrated 10/100BASE-T Digi-Φ™ transceivers perform all
the physical layer interface functions for 100BASE-TX fullduplex or half-duplex Ethernet on Cat. 5 twisted pair cable and
10BASE-T full or half-duplex Ethernet on Cat. 3, 4, or 5 cable.
The device includes nine internal Media Access Controllers.
Each MAC is dual speed and capable of both half and full duplex
operation. Flow control is provided in the half duplex mode with
backpressure. In full duplex mode, 802.3x frame-based flow
O V E R V I E W
Switch Fabric
DMA Interface
Memory Bus
ARL
LED Interface
LEDs
control is supported. Each MAC is 802.3 compliant and supports
maximum frame sizes of either 1522 or 1536 bytes.
An integrated address management engine provides address
learning and recognition functions at maximum frame rates. The
address table provides capacity for up to 16k unicast addresses
depending upon the memory size. Addresses are added to the
table after receiving an error-free packet. Broadcast and multicast
frames are forwarded to all ports except the port where it was
received.
The ninth port of the device can be configured for either an MII
interface or a high speed expansion port. In MII mode, the port
interfaces to an external transceiver and functions identically to
the other eight ports. The expansion mode provides over 2 Gbps
of bandwidth to a second BCM5308 providing a 16-port nonblocking switch solution. Alternatively, the expansion port can be
daisy chained for higher port density solutions, up to a total of 24
ports.
Broadcom and the Broadcom Logo are registered trademarks of Broadcom Corporation.
Digi-Φ is a trademark of the Broadcom Corporation.
For more information please contact us at:
Phone: 949-450-8700, FAX: 949-450-8710
Email: [email protected]
Visit our web site at: www.broadcom.com
© 1999 BROADCOM CORPORATION
BCM5308.0PB3.16.99
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
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