Broadcom Confidential
Quick Start Guide
BCM953128R8G
953128R8G-QSG100-R
5300 California Avenue • Irvine, CA 92617 • Phone: 949-926-5000 • Fax: 949-926-5203 December 13, 2010
BCM953128R8G Reference Board
Broadcom Confidential
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respective owners.
Broadcom Corporation
5300 California Avenue
Irvine, CA 92617
© 2010 by Broadcom Corporation
All rights reserved
Printed in the U.S.A.
Revision History
Revision Date Change Description
953128R8G-QSG100-D 12/13/10 Initial release
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Table of Contents BCM953128R8G Quick Start Guide
BROADCOM Reference Board
December 13, 2010 • 953128R8G-QSG100-R Page 3
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Table of Contents
Overview.........................................................................................................................................................6
Block Diagram.................................................................................................................................................6
Connectors......................................................................................................................................................8
Switch .............................................................................................................................................................8
LEDs.................................................................................................................................................................8
Loop Detection Function ................................................................................................................................8
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List of Figures BCM953128R8G Quick Start Guide
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December 13, 2010 • 953128R8G-QSG100-R Page 4
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List of Figures
Figure 1: BCM953128R8G Block Diagram ..........................................................................................................6
Figure 2: BCM953128R8G Front View ................................................................................................................7
Figure 3: BCM953128R8G Rear View .................................................................................................................7
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List of Tables BCM953128R8G Quick Start Guide
BROADCOM Reference Board
December 13, 2010 • 953128R8G-QSG100-R Page 5
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List of Tables
Table 1: BCM953128R8G Connectors ................................................................................................................8
Table 2: BCM953128R8G Switch ........................................................................................................................8
Table 3: BCM953128R8G LEDs ...........................................................................................................................8
Broadcom Confidential
Overview
BROADCOM Reference Board
December 13, 2010 • 953128R8G-QSG100-R Page 6
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BCM953128R8G Quick Start Guide
Overview
This document describes how to bring up the Broadcom BCM953128R8G reference board.
Because there is no CPU in unmanaged mode application, the EEPROM is needed in this reference board to
configure switch BCM53128 when the board powers on. The EEPROM has been preprogrammed before it is
placed into the socket in the board.
Block Diagram
Figure 1 is a generalized block diagram for the BCM953128R8G reference board.
Figure 1: BCM953128R8G Block Diagram
Magnetics
1x8 RJ45
J6
BCM53128
EEPROM
(on Socket)
Power
LED
12V
Power
Jack
Loop
Detect
Switch
Power
Regulator
U7
U13
D28
U12
Magnetics Magnetics Magnetics
SW1
J1
U8 U9 U11
J7
J5
J9
Port 8
LED
Port 7
LED
Port 6
LED
Port 5
LED
Port 4
LED
Port 3
LED
Port 2
LED
Port 1
LED
D27D26D25D24
D23D22D21D20
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Block Diagram
BROADCOM Reference Board
December 13, 2010 • 953128R8G-QSG100-R Page 7
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BCM953128R8G Quick Start Guide
Figure 2 is the front view of the BCM953128R8G. The LEDs provide the following information:
• The top LED(s) display the link speed as follows: green for 1000 Mbps, yellow for 100 Mbps, and off for
10 Mbps.
• The Link/Act LED displays steady green if there is a link and blinking if there are activities per port.
Figure 2: BCM953128R8G Front View
Figure 3 is the rear view of the BCM953128R8G.
Figure 3: BCM953128R8G Rear View
Pwr
LED
Link/Act
100M
654321
1000M
87
10M(off)
LoopDTech
on off
12345678
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Connectors
BROADCOM Reference Board
December 13, 2010 • 953128R8G-QSG100-R Page 8
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BCM953128R8G Quick Start Guide
Connectors
Switch
LEDs
Loop Detection Function
When the board powers on, loop detection is always enabled and activated if you press the LoopDTech™ switch
on the rear panel to the ON position. However, for loop detection to work properly (generate loop discovery
packages), it may need to have a package sent from any port. If you are using one cable only to connect two
ports to make a loop, while other ports are unconnected, loop detection does not work.
Loop detection also includes detecting a loop through other switches or routers, and not only by cable looping
two ports of the BCM953128 directly.
When the loop is detected, the Link/Act LED on that port RJ45 connector blinks slowly (slower than the traffic
active LED), and the 100M/1000M speed indication LED turns off. This feature does not repair the loop and only
issues a warning.
Table 1: BCM953128R8G Connectors
Number Settings
J9 MDC/MDIO connector (not installed by default)
J5 SPI 6-pin connector (not installed by default)
J1 12V/1A DC power source
SW1 Loop detection switch
Table 2: BCM953128R8G Switch
Number LoopDTech™ Switch Settings
SW1 ON Activate loop detection function.
OFF Inactivate loop detection function.
Table 3: BCM953128R8G LEDs
Number Settings
D20–D27 Port1, Port2, Port3, Port4, Port5, Port6, Port7, and Port8 LED: speed LED, Link/Act LED
D28 Power LED
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5300 California Avenue
Irvine, CA 92617
© 2010 by BROADCOM CORPORATION. All rights reserved.
953128R8G-QSG100-R December 13, 2010
Broadcom® Corporation reserves the right to make changes without further notice to any products
or data herein to improve reliability, function, or design.
Information furnished by Broadcom Corporation is believed to be accurate and reliable. However,
Broadcom Corporation does not assume any liability arising out of the application or use of this
information, nor the application or use of any product or circuit described herein, neither does it
convey any license under its patent rights nor the rights of others.
BCM953128R8G Quick Start Guide
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