switches to be implemented with the PHYs in a sin-
gle row, with room remaining for 6 QSFP uplinks.
The BCM84848 offers lower power than our first-
generation 40 nm 10GBASE-T PHYs while adding
Energy Efficient Ethernet (EEE) for 1000BASE-T and
100BASE-TX, in addition to 10GBASE-T. Optional
Adaptive Voltage Scaling (AVS) delivers a low
power solution while enabling a low cost imple-
mentation. The BCM84848 is based on a highly
advanced digital signal processor architecture to
enable robust operations over worst case UTP
cables.
Features
•
Highly integrated four-port 10GBASE-T
Ethernet transceiver.
•
Supports multiple speeds: 10GBASE-T as well
as 100BASE-TX and 1000BASE-T.
•
XFI and SGMII MAC interface options.
•
Compliant with IEEE 802.3, IEEE 802.3an,
IEEE 802.3ab, IEEE 802.3u, and IEEE 802.3az
standards.
•
AutogrEEEn technology permits legacy MACs
to receive the power savings of EEE in periods
of reduced link utilization.
•
Reduced number of power supplies with stan-
dard voltages: 1.0V and 2.5V.
•
AVS for the creation of a local DVdd supply
from a 3.3V global supply.
•
Synchronous Ethernet (SyncE) support.
•
Cable plant diagnostics.
•
IEEE standard 1588-2008 (version 2) support.
•
Detection and correction of pair swaps (MDI
crossover), pair skew, and pair polarity.
•
Support for jumbo packets up to 18 KB.
•
Super-Isolate mode to completely disable a
selected port.
•
IEEE 1149.1 (JTAG) boundary scan.
•
Extensive selection of both line and network
side loopbacks.
MDI
Highlights
•
The BCM84848 delivers a
second-generation 40 nm
10GBASE-T PHY in a small 23 x
23 mm BGA package.
•
Standard 1RU switching plat-
forms can implement a single-
row PHY design with this 23 x 23
mm package
•
Energy Efficient Ethernet (EEE) is
now delivered on all network
speeds: 10GBASE-T, 1000BASE-
T, and 100BASE-TX. EEE provides
significant power reduction, and
AutogrEEEn® enables EEE with
legacy MACs.
Summary of Benefits
•
Small 23 x 23 mm package enables single-row
PHY design for 48-port switches while offering
forward compatible footprint
•
Robust operation over 100m Cat6a cables
with industry-standard 4-pair magnetics.
•
Auto-negotiation lowers system
administration cost.
•
EEE on GbE delivers lower power for legacy
interconnections.
•
IEEE standard device interoperability:
100 Mbps, 1000 Mbps, and 10 Gbps.
•
Cuts design constraints to meet EMI standards.
•
Quad 10GBASE-T PHYs are ideal
for 48-port, top of rack (ToR)
switches, and 4x 10GbE
adapters.
•
Simplified system design with
only two power supplies and no
external MDI components.
•
1588 Precision Time Protocol
(PTP) provides precise and
accurate synchronization of
nodes in the network.
•
802.1ae MACsec Security.
BCM84848
XFI
Transformer
RJ-45
Service
Provider
OTN/PTN
Data Centers
Enterprise
Supported
Best Choice
XFI
MAC
Controller
or
Switch
MDI
Transformer
RJ-45
XFI
BCM84848
MDI
Transformer
RJ-45
XFI
MDI
Transformer
RJ-45
BCM84848 [Port 1]
BCM84848 [Port 2]
BCM84848 [Port 3]
SYNC_IN0
IEEE 1588/SyncE
SYNC_IN1_OUT
INTERR_MLC
Frame
Frame
Scramble
Scramble
LDPC
LDPC
Encode
Encode
4D DSQ
4D DSQ
128 Map
4D Pre-H
Decode
Decode
RD[1] +
TD[1] +
XFI
XFI SGMII /SGMII
XAUI ™ MAC
/SGMII
interface
MAC
Interface
4D DAC
Deframe
Deframe and
and
Descramble
LDPC
LDPC
Decode
Decode
4D DSQ
4D DSQ
128 Soft
128 Soft
Decisions
Decisions
Matrix
Matrix
Xtalk
Xtalk
Canceler
Canceller
and
and
Equalizer
Equalizer
4D Clock
Recovery
TRD[1][0:3]
4D ADC
BCM84848 [Port 4]
MDC
MDIO
SI
SCK
CSb
SO
MDIO
MDIO
Management
Interface
Interface
MII Registers
LED
LED
Controller
Controller
10 LEDs
SPI
Shared Functions
Clock
Clock
Generator
Generator
+ XTALN
+ XTALP
MDC
MDIO
SI
SCK
CSb
SO
MDIO
MDIO
Management
Interface
Interface
MII Registers
LED
LED
Controller
Controller
10 LEDs
SPI
Shared Functions
Clock
Clock
Generator
Generator
+ XTALN
+ XTALP
BCM84848 Block Diagram for Each Port
The BCM84848 quad-port PHY enables
customers to design high-density ToR
switches, modular line cards, and 4x
10GbE server adapters. The BCM84848 is
a second-generation 40 nm device that
adds important features such as EEE, on
1000BASE-T and AVS, which can reduce
implementation cost and power.
The MAC interface for the BCM84848 is a
high-performance XFI I/O, which is able
to support virtually all switch/PHY
connections for ToR switches. Support
for EEE is provided both through LPI
commands over the XFI interface and via
Broadcom's AutogrEEEn feature. EEE is
supported for all three speeds: 10GBASE-
T, 1000BASE-T, and 100BASE-TX. Support
for 1588v2 in the BCM84848 is part of
Broadcom's broad offering of PTP
devices. The IEEE 802.1ae MACsec
implementation is part of Broadcom's
broad offering of security devices.
The BCM984848_16PORT is available and
provides a reference design platform
suitable for evaluation of the device. A
design guide is provided as part of the
device support information. Contact your
Broadcom sales representative for
information.
Part Number
BCM84848A1KFSBG
Ordering Information
484-pin FBGA (RoHS-compliant)
About Broadcom
Broadcom Corporation (NASDAQ: BRCM),
a FORTUNE 500® company, is a global
leader and innovator in semiconductor
solutions for wired and wireless communi-
cations. Broadcom® products seamlessly
deliver voice, video, data, and multimedia
connectivity in the home, office, and
mobile environments. With the industry's
broadest portfolio of state-of-the-art sys-
tem-on-a-chip and embedded software
solutions, Broadcom is changing the world
by Connecting everything®. For more infor-
mation, go to
www.broadcom.com.
Broadcom, the pulse logo, Connecting everything, and the Connecting everything logo, and AutogrEEEn® are among the trademarks of Broadcom Corporation and/or its affiliates in the United
States, certain other countries and/or the EU. Any other trademarks or trade names mentioned are the property of their respective owners.
September 24, 2012 • 84848-PB00-R
Mouser Electronics
Authorized Distributor
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