application note
Contents
1. 2003 www nallatech com Page 3 then brings the designs temperature back into the valid range by varying oscillator ones frequency O nce this has been achieved the program clears the temperature alert and it resumes waiting for an interrupt IMPORTANT NOTE This program can run indefinitely since it waits for an interrupt which will only occur if the FPGA temperature exceeds the thresholds set using the defines MAX ALERTTEMP and MINALERTTEMP This example can be found in the source code temperatureinterrupt folder 6 C C API functions The voltages can either be returned for the whole module or simply for one of the individual power supplies depending upon the API calls arguments Details of what each of these four power supplies are controlling can be found in your motherboard modules user manual As a rough guide these are Power Supply Description Power Supply A Memory supply Power Supply B DIME I O supply Powers the iob s of the FPGA that allows motherboard to module communications Power Supply C FPGA Core Supply Power Supply D Multipurpose supply e g supplies any secondary FPGA on the module Table 1 Power Supply usage details N ote that for the BenN UEY the on board FPGAS core power supply is power supply A The C C API functions detailed below have been taken out of the C C API Developers Guide 6 1 DIME_ModuleControl Syntax DWORD DIME ModuleControl DIME HANDLE handle DWORD ModuleNum DWORD CmdMode DW ORD2. Value Arguments handle is a valid handle to a DIME carrier card ModuleN um is the module that is being addressed N ote modules are numbered from 0 CmdMode This argument is used to specify what particular aspect of module is to be controlled Description dinff EMPALERTMAX This command mode is used to set the maximum temperature level for the temperature alert signal O nce set if the FPGA die temperature exceeds this temperature the then the temperature alert signal is triggered N ote that the power on default setting for this temperature is 255 degrees C elsius Value should be the integer value that the maximum alert should be set to in degrees Celsius dinff EMPALERTMIN This command mode is used to set the minimum temperature level for the temperature alert signal O nce set if the FPGA die temperature falls below this temperature the then the temperature alert signal is triggered N ote that the power on default setting for this temperature is 0 degrees C elsius Value should be the integer value that the minimum alert should be set to in degrees Celsius dinff EMPALERT CLEAR This clears the temperature alert signal if set N ote that if either the maximum or minimum temperature limits are still exceeded then the alert signal will immediately be set Value should to set to 0 Table 2 DIME_ModuleC ontrol CmdMode argument options Value This argument is command mode specific Return Returns 1 on error Description This f
3. 100millivolts Table 5 DIME_PPSStatus Command Mode options The return is dependant upon the selected command mode Description Returns status information for the programmable power supplies Note Example N T 302 0005 The voltage capabilities are only applicable to DIME II systems Issue 1 19 Sep 2003 www nallatech com Page 6 Get the Voltage for module 0 power supply C i DWORD Voltage Voltage DIME_ PPSStatus hCardl1 doppsMODULEO aQppsSuPPLYC dappsVOLTAGE printf Core Voltage is d millivolts n Voltage Get the Voltage for all of module 0 Voltage DIME_ PPSStatus hCardl1 dppsMODULEO dppsALLSUPPLIES dppsVOLTAGE printf The total Voltage for Module 0 is d n Voltage Figure 5 Getting information on the power supply voltages 7 User FPGA design considerations 7 1 Introduction An example design has been specified to give an example of a high toggle rate design which uses the Temperature Sensor Alert signal as an Interrupt to the PCI Interface This design toggles over 75 of the flip flops in a 2V3000 Virtex2 FPGA simultaneously The ALERT signal from the Temperature Sensor is inverted and clocked to output an INTERRUPT The INTERRUPT signal is ACTIVE when the ALERT signal goes ACTIVE ALERT is active LOW and INT is active HIGH 7 2 Files Supplied File Name Description MaxPower vhd VHDL File Toplevel design file for reference design NGC File Synthesised file Th
4. APPLICATION NOTE DIME Il Temperature and power management NALLATECH Sep 2003 www nallatech com NT 302 0039 Issue 2 1 Introduction Being able to monitor and react to changing environmental requirements and conditions are key elements in good system design This application note details how this can be achieved using the temperature monitoring features provided through N allatech s FUSE software and DIME II hardware This is primarily achieved using software calls that provide an instantaneous temperature and voltage There is also an embedded temperature FPGA alert that allows the user FPGA design to complete the feedback loop between software and the hardware This application note covers all user aspects of the DIME Il temperature and voltage management features such as Applicable N allatech hardware technical specifications software interfacing and design considerations 1 1 Abbreviations e FUSE Field Upgradeable Software Environment e DIME DSP and Imaging Module for Enhanced FPGAs e API Application programming interface 1 2 Applicable Nallatech hardware All DIME Il motherboards such as the BenONE and the BenNUEY support the temperature and power management functionality with the exception of the BenERA All DIME Il modules support this functionality with the exception of the BenBLUE and the BenFAD For software compatibility please ensure that the latest FU SE software is installed 2 T echnical Specifications 2 1
5. FPGA Tempersiue 1 Feeding numia Bb isi L E Temperstive Dioda Celius FPGA Majd Chem Aimi Sat Almls Cunert Temperatuce T Yal Hinmum empersbure 0 R Vokege Power Supply Seleri Hean Tenperahin e Suphi M Supply C Haim T i a Suppye 7 Supply O jara Module Temoersiuve isla le Show Config 0 Save FPGA Tempersiae Dala Help fl Chose Figure 1 Card Monitoring Utility The source code for this utility can be found in the source code card monitor folder 4 Example accelerator control utility A precompiled utility called acelctrl exe is provided with this application note and can be found in the bin folder The main screen from this utility is shown in Figure 2 This utility controls the temperature of a design to ensure that the design is always running within a desired temperature range The designs temperature is controlled by varying oscillators one s sys clock frequency The program periodically polls approximately once every half second the interrupt pin to determine if the temperature alert signal has been activated and therefore if the FPGAs temperature is exceeding the thresholds Upon determining if the device is over or under temperature the oscillators frequency is accordingly raised or lowered until the design is running within the desired temperature range The temperature alert signal is then cleared and the utility then resumes its normal polling mode After the
6. Temperature All temperatures provided in degrees Celsius and are accurate to 1 degree Range 0 to 256 degrees C elsius Approximate time for an API call 15milli seconds 2 2 Voltage All voltages are given in millivolts and are accurate to 100 millivolts Range 0 5 Volts Approximate time for an API call 15milliseconds N ote The times given for the API calls where taken with the card connected over the PCI interface These are approximate times and depend upon several factors such as operating system PCI chip set PCI bus usage and processor speed The times given where taken using a DELL Dimension 4100 which had an Intel Pentium 3 800MHz processor 3 Example monitoring utility A precompiled utility called dispdata exe is provided with this application note and can be found in the bin folder The main screen from this utility is shown in Figure 1 This utility provides an easy way to monitor a card modules voltage and temperature Full details of how to use this utility are provided in the monitoring utilities help system N T302 0005 Issue 1 19 Sep 2003 www nallatech com Page 1 Acard Monitor 1 39 5 Captive Conio Ged currani cad handia Temperature Vokage Module Select Pidie Tepr fe Hodie 0 i Fa Hos i Hahi l Aden Temp 1 Min Tang Le eee Fasa C Modde 3 f T Module Temp F FPGA Tanp E Temperahae Alat Settings Maximum FPGA Temperatuce 0 ij 0 Hinmam
7. ccelerator Controller v1 0 O Capture Control 7 i amparaiu Gel cutani cad handle oo Hide Select Device Select FRNA Teinie ir a Module 0 Dewees 0 a FPGA C Module 1 f Dewce 1 tea Terie gi Wm enp e i r ook Freq T5 m i cr 3 Select bitie shart Temperature degaes c in Accelero conin a 45 Mamim FPGA Tengetatuse 2 73 Hinmum FPGA Temperate 27 7 ka 30 Ti di rial Clock Frequency MHZ 0 sp 100 150 200 250 300 350 400 450 S00 s50 Resda number Alert Vai at Time Seconds 15 Nunha ef Lapi Lick Fieg uence pi Luisari FPGA Taraa At Number of abit hardier cals 20 Clee Giaph Clee Log Wie clock im eesimings J ff Doce Figure 2 Accelerator Controller Utility 5 Example C Code Two example programs are provided with this application note The first example program further demonstrates how to use the API calls detailed in section 6 This can be found in the source code temperatureVandlcalls folder The second example shows how to use the interrupt feature combined with the temperature alert to ensure that a design operates within its desired temperature constraints Once the card has been configured the alert limits for the temperature sensor are set Then interrupts are enabled The program then waits for an interrupt which is generated by the design whenever the temperature alert signal is activated It NT 302 0005 Issue 1 19 Sep
8. design has been within the temperature thresholds for a period of time specified by the Number of Loops parameter the design is deemed to be at a stable temperature and the program will terminate details the designs optimal clock frequency for the program constraints and the designs power consumption There are several parameters that control the utility These are detailed below Maximum FPGA Temperature This is the upper temperature threshold A design that reaches this temperature is deemed to be exceeding its temperature constraints and the clock frequency will be lowered Set this to one degree more than the maximum temperature that your design can be run at Minimum FPGA Temperature This is the lower temperature threshold Set this to one degree less than the minimum temperature that your design can be run at Initial Clock Frequency This is the starting clock frequency for the monitor Alert W ait Time Once a threshold is exceeded and the clock frequency either raised or lowered the program will wait a period of time for the temperature to come back within limits before either further reducing the clock frequency or clearing the alert This period of time is the alert wait time If the FPGA rapidly heats or cools then this should be to set to a shorter period of time than if the design is slower to react to temperature changes N T302 0005 Issue 1 19 Sep 2003 www nallatech com Page 2 Number of Loops This is the number of times tha
9. e of any circuitry described other than circuitry entirely embodied in its products No other circuit patent licenses are implied N allatech Ltd will not assume responsibility for any circuits shown nor represent that they are free from patent infringement or of any other third party right N allatech Ltd assumes no obligation to correct any errors contained herein or to advise any user of this text of any correction if such be made Nallatech Ltd will not be liable for the accuracy or correctness of any engineering or software support or assistance provided to a user N T302 0005 Issue 1 19 Sep 2003 www nallatech com Page 8
10. e toplevel VHDL file references this file BenADDA_2V3000_FF1152 ucf User Constraint File User Constraint File for design Requires BenADDA 2v3000 FF1152 maxpower_with_alert_interrupt_2v3000_ff1152 bit Bit File Configuration file for BenA DDA 2v3000 FF1152 Table 6 FGPA Reference Design Files N T302 0005 Issue 1 19 Sep 2003 www nallatech com Page 7 8 Modification Record Date Issue Comments 14 Nov 02 1 Document Introduction 19 Sep 03 Updates to Figure 1 Europe amp Asia Pacific North America N allatech N allatech Inc Boolean House Suite 300 O ne N apier Park 12565 Research Parkway NALLATECH Cumbernauld Orlando Glasgow G68 OBH Florida 32826 United Kingdom United States of America www nallatech com Phone 44 0 1236 789500 Phone 1 407 384 9255 email support nallatech com Fax 44 0 1236 789599 Fax 1 407 384 8555 2003 Nallatech Ltd All Rights Reserved The N allatech name and the Nallatech logo are trademarks of N allatech Ltd All other trademarks are the property of their respective owners N allatech Ltd does not assume any liability arising out of the application or use of any product described herein nor does it convey any license under its copyrights or any rights of others Nallatech Ltd reserves the right to make changes at any time in the order to improve reliability function or design and to supply the best product possible N allatech Ltd cannot assume responsibility for the us
11. emp MaxAlert MinAlert Read the FPGA temperature degrees c FPGATemp DIME_ModuleStatus hCard1 ModuleNumber dinfFPGATEMP Read the module temperature degrees c ModuleTemp DIME_ModuleStatus hCardl1 ModuleNumber dinfMODULETEMP Read the maximum alert threshold temperature degrees c MaxAlert DIME ModuleStatus hCardl ModuleNumber dinfTEMPALERTMAX Read the minimum alert threshold temperature degrees c MinAlert DIME_ ModuleStatus hCardl ModuleNumber dinfTEMPALERTMIN Figure 4 Reading the temperature alert levels and the FPGA and module temperatures 6 3 DIME _PPSStatus Syntax DIME PPSStatus DIME HANDLE handle DWORD ModuleNum DWORD SupplyNum DW ORD CmdMode Arguments handle is a valid handle to a DIME carrier card Return ModuleN um This is the module number SupplyN um This argument is used to specify what particular power supply is targeted Valid supply numbers are given below SupplyN um Description Power Supply A is selected Power Supply B is selected Power Supply C is selected Power Supply D is selected All supplies are selected Table 4 DIME_PPSStatus Supply Number options CmdMode This argument is used to specify what particular aspect of programmable power supplies information is required C mdMode Description dppsVOLTAGE This command mode selects that only voltage information is returned The voltage returned is given in millivolts and has an error of
12. t the temperature is polled within the thresholds before the design is deemed to be stable The polling rate is approximately every half second Setting this to a large number increase confidence that the final frequency found is a stable frequency for this design with the given constraints N umber of alert handler calls Every time either of the temperature thresholds is exceeded an alert handler is called within the program to bring the FPGAs temperature back within the thresholds The number of alert handler calls is the maximum number of times this alert handler is called before the utility will terminate This parameter is included since if the valid FPGA temperature range is too small then the designs temperature will oscillate between being over temperature and under temperature and the program would run indefinitely Max clock limit warnings This is the number of times that the oscillators are allowed to be running at either there maximum Or minimum frequency and the design running out of its desired temperature range before the program is terminated So for example if the alert time is set to 15 and the maximum lock limit warnings set to 3 then the design could run over or under temperature for a total of 45seconds before the program terminates and the design is held in reset A reference FPGA design is provided See section 7 for details The source code for this utility can be found in the source code accelerator control folder FY a
13. the die temperature of the FPGA in degrees Celsius Temperatures are accurate to 1 degree Return Description Example dinfMO DULET EMP This command mode returns the temperature of the module in degrees Celsius Temperatures are accurate to 1 degree N ote that this temperature is measured next to the User FPGA and hence usually follows the FPGA temperature It shows the temperature of the module as a whole but not one specific device dinff EMPALERTMAX This command mode is used to set the maximum temperature level for the temperature alert signal O nce set if the FPGA die temperature exceeds this temperature the then the temperature alert signal is triggered N ote that the power on default setting for this temperature is 255 degrees C elsius dinff EMPALERT MIN This command mode is used to set the minimum temperature level for the temperature alert signal O nce set if the FPGA die temperature falls below this temperature the then the temperature alert signal is triggered N ote that the power on default setting for this temperature is 0 degrees C elsius Table 3 DIME_ModuleStatus C mdMode argument options The return value is dependant upon the command mode Returns 1 on error This function returns module status information N T302 0005 Issue 1 19 Sep 2003 www nallatech com Page 5 read the temperature alert levels and both the module and FPGA temperatures DWORD ModuleNumber 0 DWORD FPGATemp ModuleT
14. unction is used to control certain aspects of the selected module Example N T302 0005 Issue 1 19 Sep 2003 www nallatech com Page 4 DWORD DWORD DWORD Set MaxAlert 65 MinAlert 0 ModuleNumber 0 the max and min alert levels if DIME ModuleControl hCardl ModuleNumber dinfTEMPALERTMAX MaxAlert 0 printf Maximum FPGA Temperature set to d degrees n MaxAlert LEDI ME ModuleControl hCardl1 ModuleNumber dinfTEMPALERTMIN MinAlert 0 printf Minimum FPGA Temperature set to d degrees n MinAlert this code should be place in your temperature alert handler once you ve dealt with the alert and desire to clear the alert line to the FPGA if DIME ModuleControl hCardl ModuleNumber dinfTEMPALERTCLEAR 0 0 printf The temperature alert line for module d has been cleared n ModuleNumber Figure 3 Setting the maximum and minimum temperature alert limits and clearing an alert 6 2 DIME _ModuleStatus Syntax Arguments DW ORD DIME ModuleStatus DIME_ HANDLE handle DW ORD ModuleNum DW ORD CmdMode handle is a valid handle to a DIME carrier card ModuleN um is the module that is being addressed N ote modules are numbered from 0 CmdMode This argument is used to specify what particular aspect of module status information is to be returned The table below gives details of the available command modes C mdMode Description dinfFPGATEMP This command mode returns
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