VSC8491
WAN/LAN/Backplane RXAUI/XAUI to SFP+/KR 10 GbE SerDes PHY with VeriTime™ and MACsec
Microsemi’s 10G/1G SerDes PHY provides MACsec, IEEE 1588v2, and
hardware-based KR support for timing-critical applications, including all
industry-standard protocol encapsulations.
Highlights
• IEEE 1588v2 compliant
• 128/256-bit MACsec support
The VSC8491 device offers a seamless integration between IEEE 1588v2
• RXAUI/XAUI support
and the MACsec engine with no loss of precision. It also includes one serial
port routed to one or both of the RXAUI/XAUI interfaces using the integrated
• SFP+ I/O with KR support
• 1 GbE support
crosspoint.
VeriTime™ is Microsemi's patent-pending timing technology that delivers the
industry’s most accurate IEEE 1588v2 timing implementation. IEEE 1588v2
timing integrated in the PHY is the quickest, lowest cost method of
implementing the timing accuracy that is critical to maintaining existing
timing-critical capabilities during the migration from TDM to packet-based
architectures.
The VSC8491 device supports 1-step and 2-step PTP frames for ordinary
clock, boundary clock, and transparent clock applications, along with
complete Y.1731 OAM performance monitoring capabilities.
MACsec (IEEE 802.1AE) defines a set of protocols to meet the security
requirements for protecting data traversing Ethernet LANs, such as input
classification, frame encryption/decryption, and performance and latency
monitoring.
The VSC8491 device meets the SFP+ SR/LR/ER/ZR/220MMF host
requirements in accordance with the SFF-8431 specifications. It also
compensates for optical impairments in SFP+ applications, along with
degradations of the PCB. The VSC8491 device provides full KR support,
including KR state machine, for autonegotiation and link optimization. The
transmit path incorporates a multitap output driver to provide flexibility
to meet the demanding 10GBASE-KR (IEEE 802.3ap) Tx output launch
requirements.
A complete suite of BIST functionality includes line and client loopbacks
along with pattern generation and error detection. Highly flexible clocking
options support LAN and WAN operation using single 156.25 MHz reference
clock rate inputs for seamless Synchronous Ethernet support. The VSC8491
device includes a failover switching capability for protection routing, along
with selectable lane ordering.
10 GbE
Applications
• Multiple-port RXAUI/XAUI to
• SFI/ SFP+ line cards or NICs
• 10GBASE-KR compliant backplane
transceivers
• Carrier Ethernet networks requiring IEEE
1588v2 timing
• Secure data center-to-data center
interconnects
• 10 GbE switch cards, router cards, and
NICs
Switch Module
10 GbE Line Card or NIC
RXAUI/XAUI
Dual
10 GbE
MAC/NIC
2/4
2/4
VSC8491
1 × 10G
1 × 1G
Module
VSC8491
1 × 10G/
1 × 1G
10GBASE-KR
Backplane
2/4
2/4
RXAUI/
XAUI
RXAUI/
XAUI
Switch
Microsemi makes no warranty, representation, or guarantee regarding the information contained herein or the suitability of its products and services for any particular purpose, nor does Microsemi assume any liability
whatsoever arising out of the application or use of any product or circuit. The products sold hereunder and any other products sold by Microsemi have been subject to limited testing and should not be used in conjunction
with mission-critical equipment or applications. Any performance specifications are believed to be reliable but are not verified, and Buyer must conduct and complete all performance and other testing of the products, alone
and together with, or installed in, any end-products. Buyer shall not rely on any data and performance specifications or parameters provided by Microsemi. It is the Buyer’s responsibility to independently determine suitability
of any products and to test and verify the same. The information provided by Microsemi hereunder is provided “as is, where is” and with all faults, and the entire risk associated with such information is entirely with the Buyer.
Microsemi does not grant, explicitly or implicitly, to any party any patent rights, licenses, or any other IP rights, whether with regard to such information itself or anything described by such information. Information provided in
this document is proprietary to Microsemi, and Microsemi reserves the right to make any changes to the information in this document or to any products and services at any time without notice.
VSC8491
WAN/LAN/Backplane RXAUI/XAUI to SFP+/KR 10 GbE SerDes PHY with VeriTime™ and MACsec
Range of Support
• IEEE 1588v2/Y.1731 OAM precision timing support to within
4 ns accuracy at 1.25 Gbps and 10.3 Gbps
• Compliant to IEEE 802.1AE specifications for 128/256-bit
MACsec support
• Compliant to IEEE 802.3ae and SFF-8431 electrical (SFI)
specifications
• 9.95 Gbps WAN and 10.3 Gbps LAN operation, as well as
1.25 Gbps Ethernet support
• Supports all standard SFP+ applications
• Support for 10GBASE-KR (IEEE 802.3ap) for 10G backplanes,
including 1.25 Gbps and 10.3 Gbps auto-negotiation
• Adaptive equalization receiver and programmable, multitap
transmitter pre-emphasis
• Synchronous Ethernet support
• MDIO/SPI and two-wire serial slave management interfaces
Flexibility
•
•
•
•
Failover switching and lane ordering
VScope input signal monitoring integrated circuit
Host-side and line-side loopbacks with BIST functions
I/O programmability for lane swap, invert, amplitude, slew, pre-
emphasis, and equalization
• Optional forward error correction (FEC)
• Flexible clocking options enable Layer 1 support for
Synchronous Ethernet
• Passive copper cable support for minimum transmission cost
Related Products
Visit www.microsemi.com for information about these related
products:
• VSC8487-15
• VSC8488-15
• VSC8489
• VSC8490
• VSC8572/VSC8574
• VSC8584
Key Specifications
• 1.15 W typical for each bidirectional channel
• 1.2 V and 1.0 V core power supplies (2.5 V TTL supply)
PLL
Clocking Network for Timing and Retiming (including SyncE support)
PLL
RXAUI
XAUI
1 GbE
PCS
MUX
FIFO
SERDES
SFP+
KR
1GbE
Host/Client
2× 2× 6.25 G
2× 4× 3.125 G
2× 1× 1.25 G
SERDES
XGXS
PCS
FIFO
WIS
1× 10 G
1× 1 G
Line
RXAUI
XAUI
1 GbE
SPI/MDIO/
Two-Wire Serial
MUX
PCS
SPI Slave
MDIO Slave
Two-Wire Serial Slave
Configuration and Status Registers
Two-Wire Serial Master
Two-Wire Serial
Microsemi Corporate Headquarters
One Enterprise, Aliso Viejo, CA 92656 USA
Within the USA: +1 (800) 713-4113
Outside the USA: +1 (949) 380-6100
Sales: +1 (949) 380-6136
Fax: +1 (949) 215-4996
email: sales.support@microsemi.com
www.microsemi.com
Microsemi Corporation (Nasdaq: MSCC) offers a comprehensive portfolio of semiconductor and system solutions for com-
munications, defense and security, aerospace, and industrial markets. Products include high-performance and radiation-
hardened analog mixed-signal integrated circuits, FPGAs, SoCs, and ASICs; power management products; timing and
synchronization devices and precise time solutions; voice processing devices; RF solutions; discrete components; enter-
prise storage and communications solutions, security technologies, and scalable anti-tamper products; Ethernet solutions;
Power-over-Ethernet ICs and midspans; custom design capabilities and services. Microsemi is headquartered in Aliso Viejo,
California, and has approximately 4,800 employees worldwide. Learn more at www.microsemi.com.
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