Renesas FemtoClock 2 User manual

User Guide
FemtoClock
®2 GUI User Guide
R31US0004EU0100 Rev.1.0
Apr 22, 2021
Page 1
© 2021 Renesas Electronics
This guide assists those using the Renesas IC Toolbox software to configure and control a FemtoClock2 device.
This includes (but is not limited to) the RC22504 and RC32504 devices.
Contents
1. Installation and Setup ..................................................................................................................................2
2. Loading and Creating Configurations ........................................................................................................2
2.1 Creating a New Configuration...............................................................................................................2
2.2 Loading a Settings File.........................................................................................................................3
3. Wizard Setup.................................................................................................................................................4
3.1 Inputs....................................................................................................................................................5
3.2 DPLL.....................................................................................................................................................6
3.3 Outputs.................................................................................................................................................7
4. Side Panel Buttons.......................................................................................................................................8
5. Control Panel View.......................................................................................................................................8
6. Configuration View.......................................................................................................................................9
7. Register View..............................................................................................................................................10
8. Block Diagram View ...................................................................................................................................10
8.1 OSC Block..........................................................................................................................................11
8.2 Inputs Block........................................................................................................................................11
8.3 APLL Block.........................................................................................................................................12
8.4 DPLL Block.........................................................................................................................................13
8.5 Outputs Block.....................................................................................................................................14
8.6 Device Info..........................................................................................................................................15
8.7 GPIO Block.........................................................................................................................................15
9. Device Connection .....................................................................................................................................16
10. Errors and Warnings ..................................................................................................................................16
11. Common Configurable Settings................................................................................................................17
11.1 Changing the I2C Device Address......................................................................................................17
11.2 Disabling the Internal Input and Output Terminations.........................................................................17
11.2.1. Disabling Input Terminations................................................................................................17
11.2.2. Disabling the Output Terminations.......................................................................................18
11.3 Configuring the Device for Write Frequency Mode.............................................................................18
12. Revision History .........................................................................................................................................19

FemtoClock®2 GUI User Guide
R31US0004EU0100 Rev.1.0
Apr 22, 2021
Page 2
1. Installation and Setup
Ensure that the latest version of the Renesas IC Toolbox software is installed. New versions are released
frequently and can provide a better experience with new functionality. The Renesas IC Toolbox software can be
located on the FemtoClock®2 Evaluation Kit page.
Each device that is compatible with the Renesas IC Toolbox software has its own individual installer. This is a
convenient executable file that installs to a computer that already has the Renesas IC Toolbox software. The
FemtoClock2 installer can be located on the FemtoClock®2 Evaluation Kit page. Always check for newer
versions as new features are frequently added.
Download the installer and follow the prompts before proceeding through this document.
2. Loading and Creating Configurations
2.1 Creating a New Configuration
To create a new configuration, open the Renesas IC Toolbox software and click the New button.
In the “Select Product Family” section, select the FemtoClock2. From the “Select Product” section, select the
working device. Click the OK button to open up the new configuration. It may take a couple of minutes to open
for the first time.

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Note: Some variations between devices may show up in this guide. The intent of this guide is to encompass an
overview of the entire device family.
2.2 Loading a Settings File
Loading a settings file is similar to creating a new one. To load an existing settings file, click on the Browse
button just after opening the Renesas IC Toolbox software. This will take the user to a file browser.
Note: Recently used settings files are under the “Recent Files” section.
Navigate to the directory that stores the settings file and select it. Renesas IC Toolbox settings files have the file
type ‘.rbs’.

FemtoClock®2 GUI User Guide
R31US0004EU0100 Rev.1.0
Apr 22, 2021
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3. Wizard Setup
When creating a new configuration, the wizard page will be the first thing seen. For FemtoClock2 devices, there
are three separate wizard pages: Inputs, DPLL, and Outputs. Each section pertains to a different portion of the
device that needs to be configured for proper functionality.
Note: Some FemtoClock2 devices may not have a DPLL.
Users can navigate to individual sections by using the Next and Previous buttons in the lower right corner of the
screen or the drop-down menu in the upper right. Select the Finish button to enter the to the control panel page.

FemtoClock®2 GUI User Guide
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Apr 22, 2021
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3.1 Inputs
There are two sections to make note of when configuring the inputs: Crystal and CLKIN. The Crystal section is
used when creating a configuration that is either in synthesizer mode and uses a clock at the XIN pin, or in any
Jitter Attenuator mode. The same applies for the CLKIN section. Device mode is through the “Operation Mode”
dropdown menu. Device modes include Synthesizer, Jitter Attenuator, and DCO.
Descriptions of each mode can be found on the right side panel of the page.
Note: Some devices may not have both Jitter Attenuator and Synthesizer modes together.
When using Synthesizer mode, the user has the ability to select the APLL reference through the “APLL
Reference” drop-down menu.

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Apr 22, 2021
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3.2 DPLL
If the device is configured for jitter attenuator mode, the DPLL section will become available. The DPLL section
allows users to manually adjust bandwidth, decimator, gain peaking, and phase slope limit values. Alternatively,
the user can select a predefined SyncE profile that will automatically populate the adjustable settings.
Descriptions of each section and the SyncE profiles are on the right of the page.

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3.3 Outputs
The outputs section allows users to set output frequencies and adjust the overall VCO frequency. Outputs can
be further configured by clicking on the symbol next to the output field. This will give the user the ability to
enable/disable the output, select the output type, and adjust the signal settings.

FemtoClock®2 GUI User Guide
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Apr 22, 2021
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4. Side Panel Buttons
The side panel consists of five separate buttons. Each button takes the user to a separate page. Each page has
a unique view, allowing users to configure the device from different perspectives.
■Control Panel button takes the user to the device overview
■Wizard button takes the user back to the initial wizard
■Configuration button displays the register settings in a readable text format with a search engine
■Registers button shows a graphic of the registers in the device
■Block Diagram button takes the user to a configurable block diagram view
5. Control Panel View
The control panel view takes the user to an overview page depicting the major settings for the device. This page
can be used as an important reference for the overall device configuration.

FemtoClock®2 GUI User Guide
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Apr 22, 2021
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6. Configuration View
Configuration view allows the user to easily move through register settings via the tabs at the top of the page.
Each section has all of the critical registers and data fields listed to allow the user to configure the device block.
The search tab gives the user access to the configurable fields through a search bar. Users can use the search
engine to find any specific field they are looking for.

FemtoClock®2 GUI User Guide
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Apr 22, 2021
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7. Register View
The register view shows a graphical diagram of the registers and allows the user to read or write any of the
individual registers. By clicking on the individual register block, the given registers for that block will appear to the
right. They can either be adjusted by writing directly to the diagram or entering values into the data fields on the
right.
8. Block Diagram View
The block diagram view reflects the datasheet representation of the FemtoClock2 devices. From the main
diagram, users can adjust the operation mode, set the output frequency and type, change the output divider, set
the Xin frequency and the input frequency, and view the output frequency estimate. Each block has its own pop-
out page. This can be accessed by clicking on the block.

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Apr 22, 2021
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8.1 OSC Block
Clicking on the OSC block gives access to the settings that configure the Xin frequency and internal tuning
capacitors.
8.2 Inputs Block
Clicking on the Inputs block allows the control of the input signal type selection, input terminations, and CLKIN
frequency.

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8.3 APLL Block
Clicking on the APLL block allows users to configure the input mux, charge pump settings, and internal low pass
filter settings. Users can also change the VCO frequency and LDO voltage from here.

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8.4 DPLL Block
The DPLL block is only accessible when the device operation mode is set to “Jitter Attenuator”. This block
contains all features pertaining to the DPLL. Clicking on the DPLL block allows the user to enable reveritive or
hitless switching, adjust the phase offset, and even change the digital loop filter settings.
Note: Some FemtoClock2 devices may not have the ability to use this feature.

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8.5 Outputs Block
Each output can be configured on the main block diagram. However to reach more adjustable settings, click on
the advanced button.

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8.6 Device Info
The Device Info button opens a window that contains the Vendor ID, Device ID, Rev ID, and Dash Code.
8.7 GPIO Block
Clicking on the GPIO block allows users to configure the output enable pin, internal SDA and SCL pull-ups, and
the lock detection.

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9. Device Connection
Device connection can be done through the bottom right corner of every page. To connect one of the Renesas
evaluation boards, ensure the device is powered and connected to the working computer. Then, click the Not
Connected button in the corner of the screen. This will lead to a small pop-out page. Click the connect symbol in
the corner of the page to establish a connection to the device.
See the Evaluation Board User Manual for more information regarding device connection. This manual is located
on the FemtoClock®2 Evaluation Kit page.
10. Errors and Warnings
When adjusting the values in the configuration, errors or warnings may arise. These are used to help users stay
within the limitations of the device and give recommendations to how to configure it. Errors must be cleared
before writing to the device.
The bottom right corner of the screen shows how many errors or warnings have occurred. Click on either one to
view the contents.

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Apr 22, 2021
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11. Common Configurable Settings
11.1 Changing the I2C Device Address
1. Enter the configuration view.
2. Type “I2C” into the search bar.
3. Change the ‘TOP.SSI.I2C_ADDR_CNFG.i2c_addr’ setting to the desired address.
11.2 Disabling the Internal Input and Output Terminations
11.2.1. Disabling Input Terminations
1. Go to the block diagram view.
2. Click on the Inputs block.
3. Enable/Disable the terminations under the “Terminations” header.

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Apr 22, 2021
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11.2.2. Disabling the Output Terminations
1. Go to the block diagram view.
2. Click the advanced button under the desired output.
3. Enable the HCSL terminations through the check box under the “HCSL” header.
11.3 Configuring the Device for Write Frequency Mode
1. Go to the block diagram view.
2. Change the Operation Mode to “DCO”.
3. Adjust the frequency control word through the “Frequency Control goal (ppt)” data field.

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Apr 22, 2021
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12. Revision History
Revision
Date
Description
1.0
Apr 22, 2021
Initial release.

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