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CY28341ZC-2T Datasheet(PDF) 9 Page - SpectraLinear Inc |
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CY28341ZC-2T Datasheet(HTML) 9 Page - SpectraLinear Inc |
9 / 18 page CY28341-2 Rev 1.0, November 21, 2006 Page 9 of 18 Spread Spectrum Clock Generation (SSCG) Spread Spectrum is enabled/disabled via SMBus register Byte 1, Bit 7. System Self Recovery Clock Management 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 Byte 4 or through bytes 13 and 14, it must have previously sent a command to byte 12, for selecting which time out stamp the Watchdog must perform, otherwise the System Self Recovery feature will not be appli- cable. 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 origi- nally programmed in Byte 12, bits (3:0) (reprogram to 0000), before the Watchdog times out, then this device will keep operating in its normal condition with the new selected frequency. If the Watchdog times out the first time before the new SMBus reprograms Byte 12, bits (3:0) to (0000), then this device will send a low system reset pulse, on SRESET# (see byte12, bit7), and changes WD alarm (Byte12, Bit4) status to “1” then restarts the Watchdog timer again. If the Watchdog times out a second time, then this device will send another low pulse on SRESET#, will relatch original hardware strapping frequency (or second to last software selected frequency, see byte12, bit6) selection, set WD alarm bit (Byte12, bit4) to ‘1,’ then start WD timer again. The above-described sequence will keep repeating until the BIOS clears the SMBus byte12 bits (3:0). Once the BIOS sets Byte 12 bits (3:0) = 0000, then the Watchdog timer is turned off and the WD alarm bit (Byte 12, bit4) is reset to ‘0.’ Table 9. Spread Spectrum Table Mode SST1 SST0 % Spread 0 0 0 +0.14, –1.23 0 0 1 +0, –1.00 0 1 0 +0, –0.60 0 1 1 +0, –0.52 1 0 0 +0.72, –0.71 1 0 1 +0.47, –0.49 1 1 0 +0.34, –0.33 1 1 1 +0.30, –0.28 Swing Select Functions Through Hardware MULTSEL Board Target Trace/Term Z Reference R, IREF = VDD/(3*Rr) Output Current VOH@Z 0 50 Ohm Rr = 221 1%, IREF = 5.00 mA IOH = 4* Iref 1.0V@50 1 50 Ohm Rr = 475 1%, IREF = 2.32 mA IOH = 6* Iref 0.7V@50 |
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