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[原创] Silabs Si52204最高性能和最低功耗PCI总线时钟解决方案

关键词:PCIe时钟 服务器 网络通信

时间:2019-11-19 10:58:56       来源:中电网

Silabs公司的Si52212/08/04/02是业界最高性能和最低功耗PCIe时钟发生器,具有单独的硬件控制引脚,启用和禁用每个输出,扩展频谱启用和禁用用于降低EMI,可选择100, 133或200 MHz不同输出频率.这些频率可通过I2C来控制.Si52212/08/04/02的小占位和低功耗,使这些PCIe时钟发生器非常适合工业和消费类电子应用.器件输出低功率推挽HCSL和PCI-Express Gen 1, Gen 2,Gen 3, Gen 4, Gen 5以及SRIS兼容.低抖动为0.13ps,三角扩展频谱可降低EMI 0.25%或0.5%,内部100 Ω 或85 Ω线路匹配,可调输出转换速率.25MHz晶振输入或时钟输入,I2C支持回读功能,工作电压1.5V-1.8V,工作温度–40到85℃,小型QFN封装,主要用在服务器,存储设备,数据中心,PCIe附加卡,网络接口卡(NIC),图像适配卡,多功能打印机,数字单反(DSLR)照相机,数字相机,数字摄像机和坞站.本文介绍了Si52212/08/04/02主要特性和特性列表,框图以及评估板Si52204-EVB主要特性,框图,电路图,材料清单和PCB设计图

The Si52212, Si52208, and Si52204 can source twelve, eight, and four 100 MHz PCIe differential clock outputs, respectively, plus one 25 MHz LVCMOS reference clock output. The Si52202 can source two 100 MHz PCIe clock outputs only. All differential clock outputs are compliant to PCIe Gen1/2/3/4/5 common clock and separate reference clock architectures specifications.

The Si52212/08/04/02 feature individual hardware control pins for enabling and disabling each output, spread spectrum enable/disable for EMI reduction, and frequency select to select 100, 133, or 200 MHz differential output frequencies. These features canalso be controlled via I2C.

The small footprint and low power consumption make this family of PCIe clock generators ideal for industrial and consumer applications.

For more information about PCI-Express, Silicon Labs’complete PCIe portfolio, applicationnotes, and design tools, including the Silicon Labs PCIe Clock Jitter Tool for PCIExpresscompliance, please visit the Silicon Labs PCI Express Learning Center.

Si52212/08/04/02主要特性:

• 12/8/4/2-output low-power, push-pull HCSLcompatible PCI-Express Gen 1, Gen 2,Gen 3, Gen 4, Gen 5, and SRIS-compliantoutputs
• Low jitter: 0.13 psrms max, Gen 5
• Individual hardware control pins and I2Ccontrols for Output Enable, SpreadSpectrum Enable and Frequency Select
• Triangular spread spectrum for EMIreduction, down spread 0.25% or 0.5%
• Internal 100 Ω or 85 Ω line matching
• Adjustable output slew rate
• Power down (PWRDNb) function supportsWake-on LAN (except Si52202)
• One non-spread, LVMCOS reference clockoutput (except Si52202)
• Frequency Select to select 133 MHz or200 MHz (except Si52202)
• 25 MHz crystal input or clock input
• I2C support with readback capabilities
• Extended temperature: –40 to 85 ℃
• 1.5–1.8 V power supply, with separateVDD and VDD_IO
• Small QFN packages
• Pb-free, RoHS-6 compliant

Si52212/08/04/02应用:

• Servers
• Storage
• Data Centers
• PCIe Add-on Cards
• Network Interface Cards (NIC)
• Graphics Adapter Cards
• Multi-function Printers
• Digital Single-Lens Reflex (DSLR) Cameras
• Digital Still Cameras
• Digital Video Cameras
• Docking Stations

Si52212/08/04/02特性列表:

• 12/8/4/2-output 100 MHz PCIe Gen 1/2/3/4/5 and SRIS compliant clock generator, with push-pull HCSL output drivers
• High port count with push-pull HCSL outputs to support highly integrated solution, eliminating external resistors for the HCSL outputdrivers
• Low jitter of 0.13 psrms max to meet PCIe Gen5 specifications with design margin
• Low power consumption.
• Lowest power consumption in the industry for a 2-output PCIe clock generator
• Individual hardware control pins and I2C controls for Output Enable, Spread Spectrum Enable and Frequency Select
• Output Enable function easily disables unused outputs for power saving
• Spread Enable function to turn on/off spread spectrum and to select spread levels, either down spread 0.25% or 0.5%
• Frequency Select function to select output frequency of 100 MHz, 133 MHz, or 200 MHz (except Si52202 where the output frequencyis limited to 100 MHz. Please contact Silicon Labs for 133 MHz or 200 MHz in Si52202)
• All above functions are controlled by individual hardware pins or I2C
• Internal 100 Ω or 85 Ω impedance matching
• Eliminates external line matching resistor to reduce board space
• Adjustable slew rate to improve signal quality for different applications and board designs
• Power down (PWRDNb) function supports Wake-on LAN (except Si52202)
• One non-spread, 25 MHz LVMCOS reference clock output (except Si52202)
• A buffered 25 MHz LVCMOS clock output to drive ASICS or SoCs on board
• 25 MHz reference input
• Supports a standard crystal or clock input for flexibility
• I2C support with readback capabilities
• 1.5–1.8 V power supply with separate VDD and VDD_IO (1.05 to 1.8 V)
• Temperature range: –40℃to 85℃
• Small QFN packages to optimize board space. Smallest 2-output PCIe clock generator in the industry
• 64-pin QFN (9 x 9 mm) : 12-output
• 48-pin QFN (6 x 6 mm) : 8-output
• 32-pin QFN (5 x 5 mm) : 4-output
• 20-pin QFN (3 x 3 mm) : 2-output
• Pb-free, RoHS-6 compliant

图1. Si52204框图:4输出,32-QFN

评估板Si52204-EVB

This Si52204-EVB evaluation board allows users to measure jitter performance for PCIe Gen1/2/3/4/5 and SRIS, power consumption, and signal integrity. The evaluation board features jumpers and SMA connectors for easy static configuration of the control inputs as well as providing a port of external test equipment access.

This document describes operation of the Silicon Laboratories Si52204-EVB evaluation board designed to evaluate the Si52204, 4-output PCI-Express Gen1/2/3/4 and SRIS Clock Generator. Selector switches make it easy to select the voltage for both core and IO supplies. Jumpers allow for easy static configuration of the control inputs as well as provide a port for external test equipment access. Similarly, each regulated supply can be bypassed and driven externally for precise voltage control or to measure PSRR performance.

I2C ports allow for communication to the DUT by external I2C bus analyzers/exercisers. Optimal XTAL placement and layout provide excellent phase noise performance.

Convenient probe pads and isolation resistors permit on-board single-ended or differential measurements. Finally, the PCB layout optimizes signal integrity and skew which rounds out the capabilities of this EVB.

The Si52204-EVB is an evaluation board designed to support the Si52204 device. The Si52204-EVB is designed to operate in one oftwo general operational modes:

1. Stand-alone mode: The stand-alone mode is for manual evaluation of the device. Control of device pins such as OE_xb, FS,PWRGD, REF_SA, and SS_EN is done via on-board jumpers. The jumper header (J14) also allows the user to test the enable/disable time by providing an access point for external test equipment to easily drive the enable or PWRGD pins. The DUT supplyvoltages (e.g. VDD, VDDR, VDDX, VDDA, and VDDIO) can be set via on-board switches as shown in Section 2. Each supply canbe sourced either by an on-board regulator for nominal values or via an external supply to test the device over a range of voltages(e.g. min/max supply testing).

2. I2C mode: The Evaluation Board also allows the user to setup the device via I2C commands using an external I2C driver/analyzerand connecting to the SCL/SDA header (JP7).

评估板Si52204-EVB主要特性:

• Evaluation of Silicon Labs Si52204
• DC-coupled differential output clocks
• DC-coupled single-ended reference clock
• External power or USB powered
• Switchable voltage settings
• Easy manual configuration via jumpers
• I2C port access
• Easy current measurement

图2.评估板Si52204-EVB框图

图3.评估板Si52204-EVB外形图

图4.评估板Si52204-EVB电源和电压开关与跳线位置图

图5.评估板Si52204-EVB电路图(1)

图6.评估板Si52204-EVB电路图(2)

图7.评估板Si52204-EVB电路图(3)

图8.评估板Si52204-EVB电路图(4)

图9.评估板Si52204-EVB电路图(5)

图10.评估板Si52204-EVB电路图(6)

图11.评估板Si52204-EVB电路图(7)

图12.评估板Si52204-EVB电路图(8)

图13.评估板Si52204-EVB电路图(9)
评估板Si52204-EVB材料清单:


图14.评估板Si52204-EVB电路图(1)

图15.评估板Si52204-EVB电路图(2)

图16.评估板Si52204-EVB电路图(3)

图17.评估板Si52204-EVB电路图(4)

图18.评估板Si52204-EVB电路图(5)

图19.评估板Si52204-EVB电路图(6)

图20.评估板Si52204-EVB电路图(7)

图21.评估板Si52204-EVB电路图(8)

图22.评估板Si52204-EVB电路图(9)

图23.评估板Si52204-EVB电路图(10)

图24.评估板Si52204-EVB电路图(11)

图25.评估板Si52204-EVB电路图(12)

图26.评估板Si52204-EVB电路图(13)

图27.评估板Si52204-EVB电路图(14)

图28.评估板Si52204-EVB电路图(15)

图29.评估板Si52204-EVB电路图(16)
详情请见:
https://www.silabs.com/documents/public/data-sheets/si52212-si52208-si52204-si52202-datasheet.pdf
https://www.silabs.com/documents/public/user-guides/ug277-si52204-evb.pdf
ug277-si52204-evb.pdf
si52212-si52208-si52204-si52202-datasheet.pdf

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