BCM5464 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – QUAD-PORT 10/100/1000 BASE-T GIGABIT COPPER TRANSCEIVER

BCM5464 OVERVIEW
BCM5464 Block Diagram
TRD
{1:4}*
XTALI
XTALO
RDAC {1:2}*
TX DAC
16
Gain
Automatic
Control
PGA
ADC
Auto-
Negotiation
Clock
Generator
Bias
Generator
Echo
Canceller
FFE
XTALK
Canceller
X3
DFE/
Trellis
Decoder
Timing &
Phase
Recovery
Symbol
Encoder
MUX
Serdes/
SGMII
MUX
Symbol
Decoder/
Aligner
MII
Registers
MII
MGMT
Control
16
TXD[7:0]{1:4}*
2
TX_EN {1:4}*
2
TX_ER {1:4}*
2
GTX_CLK {1:4}*
TX_CLK {1:4}*
SGIN±
SCLK±
SGOUT±
2
COL{1:4}*
2
CRS {1:4}*
RX_CLK {1:4}*
2
2
RX_DV ^{1:4}*
2
RX_ER {1:4}*
16
RXD[7:0] {1:4}*
MDIO
MDC
NTR {1:4}*
*{1:4} Refers to the 4 separate Gigabit transceivers in the BCM5464
MODES
The BCM5464 consists of four complete 10/100/1000BASE-T Gigabit
Ethernet transceivers integrated on a single monolithic CMOS chip, and
is a member of Broadcom’s QuadSquad^TM family of quad Gigabit
Ethernet PHYs. The BCM5464 is optimized for low-power and small
footprint size to enable high port density applications. The BCM5464
enables a new class of cost effective Gigabit Ethernet equipment by
lowering system cost and reducing power dissipation by nearly 25%,
driving the delivery of Gigabit bandwidth to the desktop.
The BCM5464’s digital signal processor based architecture and
advanced power management techniques combine to achieve robust and
low-power operation over the existing Category 5 twisted-pair wiring.
The BCM5464 architecture not only meets the requirements of IEEE’s
802.3, 802.3u, and 802.3ab, but maintains the industry’s highest level of
margin over IEEE requirements for echo, NEXT, and FEXT. Low-power
is key to implementing high-density Gigabit switches, and the BCM5464
has the lowest power in the industry at 750 mW per port. In addition, the
BCM5464 has extremely low EMI emissions, which reduces the design
constraints required to meet EMI radiation specifications.
The BCM5464 supports the GMII, RGMII, SGMII, and SerDes MAC
interfaces. The RGMII, SGMII, and Serial SerDes are reduced
pin count (12, 6, and 4, respectively, versus 25) versions of the GMII.
The RGMII clock timing can be adjusted to eliminate the board trace
delays required by the RGMII specification. These reduced pin count
interfaces simplify design and lower system cost by reducing the
number of layers required to route high density solutions. In addition,
these interfaces allow fewer pins at the MAC/switch, which reduces
the MAC/switch cost by enabling smaller die sizes than would be
possible with full GMII.
This device is another member of Broadcom’s 0.13-µm Gigabit copper
PHY family, joining the BCM5404, BCM5414, BCM5421, BCM5421S,
BCM5424, and BCM5434. The 0.13-µm process is the optimal process
that offers the best performance, lowest cost, and lowest power for
Gigabit copper solutions. Devices based on the 0.13-µm process offer an
excellent long-term cost curve , enabling better cost reduction over time
compared to older technologies without having to redesign or requalify
a new part.
Each port of the BCM5464 is fully independent and has individual
interface, control, and status registers, and incorporates a number of
advanced features. A link-quality indicator LED gives installers an instant
visual indication if there are any problems with the wiring plant
supporting operation at the preferred speed. This includes physical wiring
defects that the BCM5464 cannot automatically correct for, channel
conditions such as excessive cable length and return loss, crosstalk, echo,
and noise. Broadcom’s cable analyzer software can be used with the
device to provide remote management of the cable and a first level of
diagnostics and fault isolation.
The BCM5464 also has ESD tolerance well above typical industry
standards. This prevents ESD damage not only during manufacturing
but during CESD events in the field. The CESD is an ESD event that
occurs when an electrically charged network cable is plugged into a
network port, which is an issue becoming more prevalent with recent
cable installations. The BCM5464 can tolerate over 4 kV of CESD.
Broadcom^®, the pulse logo, Connecting everything^®, and QuadSquad^TM are trademarks
of Broadcom Corporation and/or its subsidiaries in the United States and
certain other countries. All other trademarks are the property of their respective owners.
®
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