Product Overview
CS4315 4-port 10G CDR with EDC
Product Description
The Inphi Corporation® CS4315 Electronic Dispersion Compensation Device (CS4315 EDC) is highly integrated
with four 10 Gbps clock and data recovery (CDR) circuits. The two receive channels have the optional integrated
Electronic Dispersion Compensation (EDC) capability. This functionality supports 2 SFP+ modules that can be
either limited or linear. Enabling the EDC capability allows the device to operate with linear SFP+ optical modules
to extend the operating range of 62.5 μm and 50 μm multimode fiber to 220 meters and beyond, and greater
than 7 meters of Direct Attach Copper cable.
The CS4315 EDC will enable the 10 GE enterprise, metro, or core market segments across all form factors
through their size, low power, and availability.
The CS4315 EDC enables the industry to move to SFP+ by increasing multi-mode fiber reach to over 220 meters
allowing a single board for design all SFP+ interface types and making it possible for higher density line cards
due to low power and small footprint.
Enabling 10 GB SFP+ and Backplane Applications Lower cost, lower power, and higher port densities are driving
SFP+ to become the predominant optical module format of these new 10G platforms. The lead application for the
CS4315 EDC is to enable the migration of datacom and telecom routers and switches to the SFP+ optical module
form factor. Four SFP+ reach applications have been standardized for 10 GbE networks: 10GBASE-SR, -LR, -LRM,
and Direct Attach Copper. The CS4315 EDC supports all four applications.
The CS4315 EDC incorporates two bi-directional 10 Gbps paths to support the increased port densities.
Additional features of the CS4315 EDC include various lookbacks, a complete set of programmable Rx and Tx
path functionality, such as output pre-emphasis, and full 1 GbE data rate support. Packaged in a small 12 mm by
12 mm flipchip package, the CCS4315 EDC has an integrated microcontroller to enable auto-adapation.
Successful interoperability testing of the CS4315 EDC with SFP+ optical modules and Direct Attach Copper cables
from leading vendors has provided the broadest collection of real life system application data available in the
industry with coverage for all four SFP+ applications: SR, LR, LRM, and Direct Attach Copper cable.
The receive and transmit CDRs on the CS4315 EDC have an operating frequency range of 9.95 to 11.3 Gbps. The
CDRs also support 8G/4G/2G/1G Fibre Channel rates. The CS4315 EDC also includes a 10GBASEKR compliant
3-tap transmit pre-emphasis. The transmit pre-emphasis and receive equalization, along with the extended
operating frequency range, make the CS4315 EDC an ideal solution for backplane link extension, in 10GBase-KR,
10G CS4212 telecom, and 10G/8G Fibre Channel applications.
SFP+ Optics
or Copper
CS4315
SFP+ Optics
or Copper
4-Ports
of
10 GE
MAC
SFP+ Optics
or Copper
CS4315
SFP+ Optics
or Copper
2953 Bunker Hill Lane, Suite 300, Santa Clara, CA 95054, Phone: (408) 217-7300 Fax: (408) 217-7350, Sales@inphi.com
Copyright © 2012−2015 Inphi Corporation. All rights reserved. Inphi is a registered trademark of Inphi Corporation
Document Number: 450108 – 2.0
Features

Functionality
 Designed to meet the requirements for SFF-8431 linear and limited systems and modules
 Equalizer capability designed to exceed the requirements of IEEE 802.3aq* 10GBASE-LRM and
10GBASE-KR
 XFI interface complies to XFP MSA specifications
 Optional support of 1.25 Gbps (IEEE 802.3ae* 1 GE)
 Integrated design that does not require external processors or memory

Transmit Path
 3 tap pre-empahsis compliant to 10GBASE-KR specifications
 Programmable output voltage amplitude
 Option to invert the polarity of TX+ and TX- signals
 Integrated limiting amplifier with programmable equalizer
 Operating range of 9.95 - 11.3 Gbps, 8.5 G, 6.25 G, 4.25 G, 2.5 G, 2.125 G, 1.0625 G, and 1.25 G
 Programmable LOS level
 Exceeds XFP jitter generation requirements

Receive Path
 Option of pre-emphasis with level programmability
 Integrated EDC with option to bypass
 Driver with programmable output voltage amplitude
 Option to invert the polarity of RX+ and RX- signals
 Integrated AGC controlled by DSP
 Operating range of 9.95 - 11.3 Gbps, 8.5 G, 6.25 G, 4.25 G, 2.5 G, 2.125 G, 1.0625 G, and 1.25G
 Exceeds XFP jitter generation and jitter tolerance requirements

EDC
 Optional EDC Equalizer exceeds the comprehensive stressed receiver test described in 10GBASE-LRM
specification
 Adaptation algorithm does not require any external processor or memory
 Default adaptation algorithm can be field upgradeable
 Advanced methods to analyze adaptation success including line SNR
 Continuously tracks and adapts to variations in channel characteristics

Physical Characteristics
 12x12mm
 121-pin BGA
 1.0mm ball pitch

Test and Monitoring
 Multiple loopback modes
 Built-in PRBS generator and checkers
 Extensive set of performance and status registers
 GPIO pins with user programmable functionality
2
 Registers and status programmable through MDIO, SPI, or I C management interface
 Serial management interface can be used to reset and read error and statistical counters
 JTAG 1149 Scan support
2953 Bunker Hill Lane, Suite 300, Santa Clara, CA 95054, Phone: (408) 217-7300 Fax: (408) 217-7350, Sales@inphi.com
Copyright © 2012−2015 Inphi Corporation. All rights reserved. Inphi is a registered trademark of Inphi Corporation
Docuiment Number: 450108 – 2.0
Block Diagram
SPI or I 2C or MDIO
uController
Interface
ISI Monitor &
Diagnostics
RX Out
TX In
RX Out
TX In
Driver
Equalizer
Driver
Equalizer
CDR
EDC
CDR
Driver
CDR
EDC
CDR
Driver
RX In
TX Out
RX In
TX Out
2953 Bunker Hill Lane, Suite 300, Santa Clara, CA 95054, Phone: (408) 217-7300 Fax: (408) 217-7350, Sales@inphi.com
Copyright © 2012−2015 Inphi Corporation. All rights reserved. Inphi is a registered trademark of Inphi Corporation
Document Number: 450108 – 2.0
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