VSC8479
9.95 Gbps to 11.3 Gbps 16-bit Transceiver
The VSC8479 is a 1:16, 16:1 transceiver with integrated Clock and Data Recovery unit (CDR) and Clock
Multiplier Unit (CMU) that provides the most comprehensive solution available in the industry. Continuous
frequency of operation spans from 9.953 Gbps to 11.3 Gbps over full temperature range.
Targeted for XFP Host ASIC SERDES, 300 pin module and DWDM line card applications, the VSC8479 provides
industry leading optimization of power, performance, programmability, price and feature integration. The
1.15 W total power dissipation enables 300 pin MSA module vendors to provide performance and functionality
advantages while dropping the overall power dissipation of their existing modules. The VSC8479 is a perfect
choice for XFP motherboards with proven inter-operability with all major XFP module vendors.
The receiver path has a high sensitivity receiver with a programmable VGA and input bandwidth equalization
(EQ) to provide stressed input data eye compensation. No external post amplifier is required for most
applications. The high-speed output is swing and pre-emphasis programmable to support a variety laser driver
and XFI host ASIC applications.
The VSC8479 fully supports all features, functions and clock modes required for 300-pin multi-source
agreement (MSA) transponder module full compliance. All loopback modes are supported with multiple line
timing clock modes.
A highly flexible reference clock source selection and reference clock clean-up support scheme is provided to
minimize external circuitry. A selectable two-wire serial or Serial Peripheral Interface (SPI) provides full micro-
controller access to all status and control registers, including software read-back capability of all external control
input pins. Any combination of discrete pins and serial register status and control can be employed. A highly
flexible PRBS and user defined pattern checker and error count provides system analysis and built-in self-
testing.
Robust cross talk immunity enables the VSC8479 to operate the Tx and Rx paths asynchronously to each
other while exceeding SONET level jitter generation and jitter tolerance performance. A high-speed output clock
can be optionally enabled for higher performance applications. An adjustable loss of signal (LOS) indicator is
integrated into the device enabling optical modulation amplitude monitoring.
The power supply scheme provides a high degree of flexibility. The device can operate on a single +1.8 V supply
with an optional +3.3 V I/O supply for 3.3 V compliant interfacing. The Tx path and Rx path can be powered
down independently. The single chip, small footprint (17 x 17 mm) allows for both cost reduction and board size
reduction for price and size aggressive, small form factor module applications. All VSC8479 devices are tested
at high-speed to insure the highest performance and quality standards you’ve come to expect from Microsemi.
TXPCLK with Phase Adjust
FIFO Alarm
TXMCLK
FIFO
16:1
MUX
High-Speed Clock*
High-Speed Data
16 × 16
CMU
SFI-4
Phase 1/
XSBI
TXPICLK
16Low-Speed Data
Tx Ref Clock
Ref Clk
Rx Ref Clock Distribution and
Clean up
Ex Ref Clock
Support
Loopback
and BIST
Line Loopback
Diagnostic Loopback
RXMCLK
RXPOCLK
16Low-Speed Data
Adjustable LOS
CDR
SFI-4
Phase 1/
XSBI
1:16
DEMUX
EQ
High-Speed Data
VGA
Control/Status Signals
I2C / SPI
Interface
Mute Controls
Invert Controls
LOL Alarms
*With Enable/Disable
External Pin Read Back
Two-wire Interface / SPI Port
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.
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