Infineon Traveo II User manual

User Guide Please read the Important Notice and Warnings at the end of this document 002-32474 Rev.*A

www.infineon.com page 1 of 8 2021-04-22

Setting CSV Parameters

Traveo™ II Family

About this document

Scope and purpose

The Clock Supervision (CSV) feature in Traveo II family enables you to check the frequency of the monitored

clock to ensure that it is within the allowed frequency window. To understand the functionality described and

terminology used in this guide, see the “Clocking System”chapter in the Architecture Technical Reference

Manual (TRM).

This guide describes how to calculate and set the CSV parameters using the CSV Calculator.

Intended audience

This document is intended for anyone using the Traveo II family to determine the CSV parameters.

Table of contents

About this document......................................................................................................................... 1

Table of contents .............................................................................................................................. 1

1Overview ................................................................................................................................. 2

2Parameters related to CSV ........................................................................................................ 3

2.1 Check the clock specifications................................................................................................................3

2.2 Determine the target...............................................................................................................................3

2.3 Calculate the lower and upper limit .......................................................................................................4

2.4 Calculate the period................................................................................................................................4

2.5 Calculate the startup delay.....................................................................................................................4

2.6 Check the values for CSV register settings .............................................................................................5

3CSV calculator example............................................................................................................. 6

Revision history................................................................................................................................ 7

User Guide 2 of 8 002-32474 Rev.*A

2021-04-22

Setting CSV Parameters

Traveo™ II Family

Overview

1Overview

Figure 1 shows the signal example of the CSV.

Monitored Clock

ReferenceClock

Period

Upper Limit

Lower Limit

Monitor Event

Lower Limit

Upper Limit

the allowed frequency window

Target

Figure 1 CSV operation signal example

The basic operation principle of the CSV circuit is as follows:

•Period is the monitored clock count while ‘Target’is the reference clock count. In an ideal case, these two

are the same.

•The monitored clock generates a Monitor event (Period), and the reference clock generates Lower and

Upper limits.

•The Monitor event is compared against the Lower and Upper limits.

•An error is reported if the Monitor event ≤Lower limit, or Monitor event > Upper limit.

User Guide 3 of 8 002-32474 Rev.*A

2021-04-22

Setting CSV Parameters

Traveo™ II Family

Parameters related to CSV

2Parameters related to CSV

Check the parameters related to CSV by the following steps.

2.1 Check the clock specifications

Check the following clock specifications:

•Reference clock frequency and tolerance (integer %)

•Monitored clock frequency and required tolerance (interger %)

The required monitored clock tolerance should be equal to or larger than the reference clock tolerance.

•Maximum startup time for the monitored clock except for WCO.

In the case of WCO, the startup time is unused (0). CSV should be enabled after WCO is started

(BACKUP_STATUS.WCO_OK = 1).

Enter the above values in the cells, highlighted in orange, of the CSV Calculator. If the Monitored clock

tolerance is smaller than Reference clock tolerance, the ‘Value’cell of Monitored clock tolerance will be

highlighted in red.

Table 1 Clock specification parameters

Parameters

Value

Unit

Remarks

Reference clock frequency

8000000

ILO: 32768 (SID320)

IMO: 8000000 (SID310)

Reference clock tolerance

Monitored clock frequency

50000000

Monitored clock tolerance

≥Reference clock torelance

Maximum startup time for monitored clock

μs

ILO: 12 (SID321)

IMO: 7.5 (SID311)

PLL200: 35 (SID340)

PLL400: 50 (SID340A)

WCO: 0 (Unused)

2.2 Determine the target

Check the minimum Target with Equation 1 using the CSV Calculator.

For example, for a tolerance of one percent, the Target must be at least 200. Increasing the Target increases the

CSV accuracy; it also increases the latency.

Equation 1

  



Determine and enter the Target highlighted in orange of the CSV Calculator referring the calculated minimum

Target. The Target should be equal to or greater than the minimum Target. If the Target is smaller than the

Minimum Target, the ‘Value’cell of the Target will be highlighted in red.

User Guide 4 of 8 002-32474 Rev.*A

2021-04-22

Setting CSV Parameters

Traveo™ II Family

Parameters related to CSV

Table 2 Target parameters

Parameters

Value

Unit

Remarks

Minimum Target (Calculated reference clock count)

200

Cycles

Target (Reference clock count for user definition)

200

Cycles

≥Minimum Target

2.3 Calculate the lower and upper limit

Calculate the Lower limit with Equation 2 using the CSV Calculator.

Equation 2

    

 

󰇡

 󰇢

Calculate the Upper limit with Equation 3 using the CSV Calculator.

Equation 3

    

 

󰇡

 󰇢

2.4 Calculate the period

Calculate the Period with Equation 4 using the CSV Calculator. If the Period value is less than one, increase the

Target value. To avoid the round off error of the Period value, the value should be as close to an integral value

as possible and not a decimal value. This can be achieved by adjusting Target value.

Equation 4

  



2.5 Calculate the startup delay

Calculate the Startup Delay with Equation 5 using the CSV Calculator. In the case of WCO, the startup time is

unused (0). CSV should be enabled after WCO is started (BACKUP_STATUS.WCO_OK = 1).

Equation 5

    󰇛



 󰇜

User Guide 5 of 8 002-32474 Rev.*A

2021-04-22

Setting CSV Parameters

Traveo™ II Family

Parameters related to CSV

2.6 Check the values for CSV register settings

You should set the values obtained by subtracting 1 from the above calculated values in the CSV register. The

CSV Calculator calculates these CSV register values based on the above parameters and automatically displays

the values in cells highlighted in green. If the Value is larger than 65535, the cell will be highlighted in red.

When determining the final CSV parameters, evaluate the CSV function sufficiently in the user system

environment.

Table 3 Parameters for CSV registers

Parameters

Value

Unit

Remarks

Upper limit value for UPPER register

204

Cycles

Maximum: 255 (Only for CSV_ILO/LF/BAK)

Maximum: 65535 (Others)

Lower limit value for LOWER register

195

Cycles

Maximum: 255 (Only for CSV_ILO/LF/BAK)

Maximum: 65535 (Others)

Period value for PERIOD register

1249

Cycles

Minimum: 0

Maximum: 255 (Only for CSV_ILO/LF/BAK)

Maximum: 65535 (Others)

Startup delay value for STARTUP register

282

Cycles

Maximum: 255 (Only for CSV_ILO/LF in

Traveo II Body)

Maximum: 511 (Only for CSV_ILO/LF/BAK in

Traveo II Cluster)

Maximum: 65535 (Others)

User Guide 6 of 8 002-32474 Rev.*A

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Setting CSV Parameters

Traveo™ II Family

CSV calculator example

3CSV calculator example

This section shows the CSV Calculator example with the following parameters:

•Reference clock frequency: 8 MHz (IMO)

•Reference clock (IMO) tolerance: 1 % (IMO)

•Target: 200 (use the same value as the calculated minimum Target)

•Monitored clock frequency: 50 MHz (CSV_HF0/PLL200)

•Monitored clock tolerance: 1 % (CSV_HF0/PLL200)

•Startup time for Monitored clock: 35 (PLL200)

Enter the above parameters in the cells, highlighted in orange, of the CSV Calculator.

Table 4 Input parameters

Parameters

Value

Unit

Remarks

Reference clock frequency

8000000

ILO: 32768 (SID320)

IMO: 8000000 (SID310)

Reference clock tolerance

Minimum Target (Calculated reference clock count)

200

Cycles

Target (Reference clock count for user definition)

200

Cycles

≥Minimum Target

Monitored clock frequency

50000000

Monitored clock tolerance

≥Reference clock torelance

Maximum startup time for monitored clock

μs

ILO: 12 (SID321)

IMO: 7.5 (SID311)

PLL200: 35 (SID340)

PLL400: 50 (SID340A)

WCO: 0 (Unused)

The CSV Calculator calculates the CSV register values based on the entered parameters and automatically

displays the values in cells highlighted in green.

Table 5 Output parameters

Parameters

Value

Unit

Remarks

Upper limit value for UPPER register

204

Cycles

Maximum: 255 (Only for CSV_ILO/LF/BAK)

Maximum: 65535 (Others)

Lower limit value for LOWER register

195

Cycles

Maximum: 255 (Only for CSV_ILO/LF/BAK)

Maximum: 65535 (Others)

Period value for PERIOD register

1249

Cycles

Minimum: 0

Maximum: 255 (Only for CSV_ILO/LF/BAK)

Maximum: 65535 (Others)

Startup delay value for STARTUP register

282

Cycles

Maximum: 255 (Only for CSV_ILO/LF in

Traveo II Body)

Maximum: 511 (Only for CSV_ILO/LF/BAK

in Traveo II Cluster)

Maximum: 65535 (Others)

User Guide 7 of 8 002-32474 Rev.*A

2021-04-22

Setting CSV Parameters

Traveo™ II Family

Revision history

Revision

Issue date

Description of change

2021-02-10

Initial release

2021-04-22

Updated the description in 2.4 and the remarks in Table 3 and Table 5.

Trademarks

All referenced product or service names and trademarks are the property of their respective owners.

Edition 2021-04-22

Published by

Infineon Technologies AG

81726 Munich, Germany

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Document reference

002-32474 Rev.*A

IMPORTANT NOTICE

The information given in this document shall in no

event be regarded as a guarantee of conditions or

characteristics (“Beschaffenheitsgarantie”) .

With respect to any examples, hints or any typical

values stated herein and/or any information

regarding the application of the product, Infineon

Technologies hereby disclaims any and all

warranties and liabilities of any kind, including

without limitation warranties of non-infringement of

intellectual property rights of any third party.

In addition, any information given in this document

is subject to customer’s compliance with its

obligations stated in this document and any

applicable legal requirements, norms and standards

concerning customer’s products and any use of the

product of Infineon Technologies in customer’s

applications.

The data contained in this document is exclusively

intended for technically trained staff. It is the

responsibility of customer’s technical departments

to evaluate the suitability of the product for the

intended application and the completeness of the

product information given in this document with

respect to such application.

For further information on the product, technology,

delivery terms and conditions and prices please

contact your nearest Infineon Technologies office

(www.infineon.com).

WARNINGS

Due to technical requirements products may contain

dangerous substances. For information on the types

in question please contact your nearest Infineon

Technologies office.

Except as otherwise explicitly approved by Infineon

Technologies in a written document signed by

authorized representatives of Infineon

Technologies, Infineon Technologies’ products may

not be used in any applications where a failure of the

product or any consequences of the use thereof can

reasonably be expected to result in personal injury.

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