Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1994-08-25
1996-10-01
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327142, 327198, 327310, H03K 1722
Patent
active
055613896
ABSTRACT:
A microprocessor clocking system is provided for achieving attenuation of a clock signal sent to a microprocessor during initial activation of a connected power supply. By attenuating the clock signal during initial turn-on of the power supply, the clock input to the microprocessor is prevented from erroneous triggering and improper operation. After a delay period has expired, the clock signal is allowed to input directly to the microprocessor input. The delay period is determined as a time exceeding normal spurious noise conditions found on the power supply during initial activation. The microprocessor clocking system includes a clock conditioning circuit configured between a clock signal output of a core logic unit and the clock signal input to a microprocessor. The clock conditioning circuit utilizes a turn-on circuit and a delay circuit coupled to the power supply voltage. The turn-on circuit and delay circuit are both connected to an attenuator, and the attentuator functions to attenuate the clock signal during initial power supply activation.
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Power on Reset Circuit Sensitive to Power Supply Level and Clock (RBM Technical Bulletin vol. 37 No. 02A Feb. 1994).
Singh, et al., "The 8086 Microprocessor and its Memory Interface", 16-Bit and 32-Bit Microprocessors, (Prentice-Hall, Inc., 1991), pp. 120-122.
Advanced Micro Devices , Inc.
Callahan Timothy P.
Daffer Kevin L.
Lam T.
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