October 2012

KC705 Si5324 Design

XTP188

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Revision History

Date Version Description 10/23/12 4.0 Recompiled for 14.3.

07/25/12 3.0 Recompiled for 14.2. Added AR50886.

05/08/12 2.0 Recompiled for 14.1.

02/14/12 1.0 Initial version for 13.4.

Overview Xilinx KC705 Board Software Requirements KC705 Setup Reducing Jitter with the Si5324 Compile KC705 Si5324 Design References

Note: This presentation applies to the KC705

KC705 Si5324 Design Description Description – The Si5324 application uses an EDK MicroBlaze system to change the settings

for the Si5324 chip on the KC705 board via IIC – Note: This design illustrates the relative differences of a Jitter Attenuator device

in Bypass mode or in PLL mode. Neither the Evaluation board nor the design are for characterization purposes. Please see the Silicon Labs web site for Jitter Attenuator device data.

Reference Design Source – rdf0177.zip – Available through http://www.xilinx.com/kc705

Note: Presentation applies to the KC705

Xilinx KC705 Board

ISE Software Requirement Xilinx ISE 14.3 software

Note: Presentation applies to the KC705

EDK Software Requirement Xilinx EDK 14.3 software

Note: Presentation applies to the KC705

EDK Software Requirement Xilinx SDK 14.3 software

Note: Presentation applies to the KC705

KC705 Setup

Connect a USB Type-A to Micro-B cable to the USB JTAG (Digilent) connector on the KC705 board – Connect this cable to your PC – Power on the KC705 board

KC705 Si5324 Setup Unzip the KC705 Si5324 Design Files (14.3 C) – Available through http://www.xilinx.com/kc705

Note: Presentation applies to the KC705

Reducing Jitter with the Si5324

Reducing Jitter with the Si5324 A means of measuring jitter is required for this section A LeCroy 816Zi-A Scope was used (stock photo shown)

Note: Presentation applies to the KC705

Reducing Jitter with the Si5324 Connect SMA cables to J13 and J14, USER_GPIO_P/N Connect these cable to your oscilloscope

Reducing Jitter with the Si5324 Open ChipScope Pro and select JTAG Chain → Digilent USB Cable… (1) Verify 30 MHz operation and click OK (2)

Note: Presentation applies to the KC705

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Reducing Jitter with the Si5324 Click OK (1)

Note: Presentation applies to the KC705

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Reducing Jitter with the Si5324 Select Device → DEV:0 MyDevice0 (XC7K325T) → Configure… Select <Design Path>\ready_for_download\si5324_bypass.bit

Note: Presentation applies to the KC705

Reducing Jitter with the Si5324 LeCroy Oscilloscope setup Press the Default Setup followed by the Auto Setup twice

Reducing Jitter with the Si5324 Adjust the Horizontal knob until you have 5 μs/div

Reducing Jitter with the Si5324 From the LeCroy scope menu, select Analysis → Serial Data…

Reducing Jitter with the Si5324 Select “Quick View”

Reducing Jitter with the Si5324 Set the inputs to Input1-Input2 and the Data to match your setup and click OK

Reducing Jitter with the Si5324 Click the Close button

Reducing Jitter with the Si5324 Note that the DCD (Duty Cycle Distortion) is 61.7 ps – See LeCroy presentation on Jitter for explanation of values

Reducing Jitter with the Si5324 Select Device → DEV:0 MyDevice0 (XC7K325T) → Configure… – Cycle power on the KC705 to clear out any previous settings in the Si5324

Select <Design Path>\ready_for_download\si5324_enabled.bit

Note: Presentation applies to the KC705

Reducing Jitter with the Si5324 Note that the DCD (Duty Cycle Distortion) is 13.7 ps – Including the Si5324 Jitter Attenuator PLL in the clock path, reduces DCD

Compile KC705 Si5324 Design

Compile KC705 Si5324 Design If desired, FPGA compile can be skipped by opening SDK directly:

Start → All Programs → Xilinx Design Tools → ISE Design Suite 14.3 → EDK → Xilinx Software Development Kit

Select the workspace: <design files>\SW\SDK Go to SDK Software Compile

Compile KC705 Si5324 Design Open XPS project <project directory>\ system.xmp Create the hardware design, system.bit, located in <project directory> /implementation – Click the Generate

Bitstream button (1) – Or from the menu, select

Hardware → Generate Bitstream

Note: Presentation applies to the KC705

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Launch KC705 Design in SDK Open SDK – Click the Export Design

button (1) – Click Export & Launch

SDK (2)

Note: Presentation applies to the KC705

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Compile KC705 Software in SDK SDK Software Compile - Build ELF files in SDK – Select Project → Build All (1) – Note: If by-passing the FPGA compile, the ELF files are already built; if

desired, the ELF files can be re-built by selecting Clean… followed by Build All

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Program KC705 with Si5324 Design

Program KC705 with Si5324 Design Init memory with the Si5324 Application ELF – Update the bitstream (download.bit) with the Si5324 Application ELF – Cycle power on the KC705 to clear out any previous settings in the Si5324 – Select Xilinx Tools → Program FPGA (1)

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Program KC705 with Si5324 Design Init memory with the Si5324 Application ELF – Select hello_iic_5324.elf (1) – Click Program

Note: Presentation applies to the KC705

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Program KC705 with Si5324 Design Note that the DCD (Duty Cycle Distortion) has a low value now

Program KC705 with Si5324 Design To set the Si5324 for Bypass mode edit the hello_iic_si5324.c Locate the line:

// Change to 1 to set Si5324 into Bypass PLL mode Change the #if 0 to #if 1

Note: Presentation applies to the KC705

Program KC705 with Si5324 Design To set the Si5324 for Bypass mode edit the hello_iic_si5324.c Scroll down and locate the line:

// Change to 1 to set Si5324 Loop Bandwidth (BWSEL) Change the #if 1 to #if 0

Note: Presentation applies to the KC705

Program KC705 with Si5324 Design Recompiled the ELF file – Select Project → Build All (1)

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Program KC705 with Si5324 Design Init memory with the Si5324 Application ELF – Update the bitstream (download.bit) with the Si5324 Application ELF – Cycle power on the KC705 to clear out any previous settings in the Si5324 – Select Xilinx Tools → Program FPGA (1)

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Program KC705 with Si5324 Design Init memory with the Si5324 Application ELF – Select hello_iic_5324.elf (1) – Click Program

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Note: Presentation applies to the KC705

Program KC705 with Si5324 Design Note that the DCD (Duty Cycle Distortion) is now higher

References

References Silicon Labs – SI5324 Data Sheet

• http://www.silabs.com/Support%20Documents/TechnicalDocs/Si5324.pdf

LeCroy – Presentation “Jitter and Jitter Breakdown Analysis”

• http://www.ist-ucells.org/news/pdf/2_jitter_and_jitter_breakdown.pdf

ChipScope Pro – ChipScope Pro Software and Cores User Guide

• http://www.xilinx.com/support/documentation/sw_manuals/ xilinx14_3/chipscope_pro_sw_cores_ug029.pdf

Documentation

Documentation Kintex-7 – Kintex-7 FPGA Family

• http://www.xilinx.com/products/silicon-devices/fpga/kintex-7/index.htm

KC705 Documentation – Kintex-7 FPGA KC705 Evaluation Kit

• http://www.xilinx.com/products/boards-and-kits/EK-K7-KC705-G.htm

– KC705 Getting Started Guide • http://www.xilinx.com/support/documentation/boards_and_kits/

ug883_K7_KC705_Eval_Kit.pdf

– KC705 User Guide • http://www.xilinx.com/support/documentation/boards_and_kits/

ug810_KC705_Eval_Bd.pdf

– KC705 Reference Design User Guide • http://www.xilinx.com/support/documentation/boards_and_kits/

ug845_Ref_Design.pdf