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CY28341-3 Datasheet(PDF) 9 Page - SpectraLinear Inc |
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CY28341-3 Datasheet(HTML) 9 Page - SpectraLinear Inc |
9 / 19 page CY28341-3 Rev 1.0, November 21, 2006 Page 9 of 19 Watchdog Self-Recovery Sequence This feature is designed to allow the system designer to change frequency while the system is running and reboot the operation of the system in case of a hang-up due to the frequency change. When the system sends an SMBus command requesting a frequency change through the Dial-a-Frequency Control Registers, it must have previously sent a command to the Watchdog timer to select which time-out stamp the Watchdog must perform, otherwise the System Self-Recovery feature will not be applicable. Consequently, this device will change frequency and then the Watchdog timer starts timing. Meanwhile, the system BIOS is running its operation with the new frequency. If this device receives a new SMBus command to clear the bits originally programmed in the Watchdog timer bits (reprogram to 0000) before the Watchdog times out, then this device will keep operating in its normal condition with the new selected frequency. The Watchdog timer will also be triggered if you program the software frequency select bits (FSEL) to a new frequency selection. If the Watchdog times out before the new SMBus reprograms the Watchdog timer bits to (0000), then this device send a low system reset pulse, on SRESET# and changes Watchdog time-out bit to “1”. Swing Select Functions Through Hardware MULTSEL Board Target Trace/Term Z Reference R, IREF = VDD/(3*Rr) Output Current VOH@Z 1 50 Ohm Rr = 475 1%, IREF = 2.32mA IOH = 6* Iref 0.7V@50 R E SET W AT CHD O G TIM E R Set W D T i mer Bi ts = 0 C l ear W D A l ar m bi t = 0 IN IT IAL IZ E W AT CHDO G TIM E R S et F r eq uenc y R ever t B i t Set W D T i mer Bi ts CHANG E F R E Q BY S E T S O FTW AR E F SEL S et S W F r eq _S el bi ts S et F S over r i de bi t CH AN G E F R E Q B Y SET DIAL - A- R AT IO S el ec t a di ffer ent di vi der r ati o CHANG E F R E Q BY S E T D IAL - A- FR E Q U E N C Y Load M and N R eg i s ter s Set Pr o_F r eq _EN = 1 W AT CHDO G TIM E R PR O G R AM M IN G CL E AR W D TIM E R Set W D Al ar m = 1 CO UNT DO W N W D TIM E R S end 3m s R es et P ul s e NO WD T im er = 0 Frequency R ev ert B it = 0 S et F r eq uenc y to F S _H W _Latc hed Freq uency R ev ert B it = 1 S et F r eq uenc y to F S _S W S etti ng S R E S E T # = 0 f o r 3 m sec Reset & Revert Frequency back Figure 1. Watchdog Self Recovery Sequence Flowchart |
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