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Programmable Power Up Sequencing of Physical Models

IP.com Disclosure Number: IPCOM000034443D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Dubler, JF: AUTHOR [+3]

Abstract

Disclosed is a method to safely power up hardware devices being used as physical models in a logic simulator. It relies on the physical model I/O behavior shell to specify the sequence of applying voltages and and input signal pin values. Proper sequencing may extend the life of devices and avoid destroying devices vulnerable to illegal input signal stimuli. Also, more complex card and board devices with multiple voltage requirements can be modeled simply and easily. The I/O behavior shell language should support statements that permit voltage pins to be configured and manipulated like signal pins. Then it is a simple matter to define an initialization subroutine which specifies the times when voltage pins and logic pins are to transition to the "on" or "off" states.

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Programmable Power Up Sequencing of Physical Models

Disclosed is a method to safely power up hardware devices being used as physical models in a logic simulator. It relies on the physical model I/O behavior shell to specify the sequence of applying voltages and and input signal pin values. Proper sequencing may extend the life of devices and avoid destroying devices vulnerable to illegal input signal stimuli. Also, more complex card and board devices with multiple voltage requirements can be modeled simply and easily. The I/O behavior shell language should support statements that permit voltage pins to be configured and manipulated like signal pins. Then it is a simple matter to define an initialization subroutine which specifies the times when voltage pins and logic pins are to transition to the "on" or "off" states. The initialization subroutine is executed by the simulator once, at the start of simulation before any user stimuli is applied. Voltage pins may have configuration parameters similar to signal pins, also. For instance, the "on" state may be defined as a programmed value for the power supply which is similar to the input pin drive high voltage specification. Parameters that adjust the current limit and slew rate are also possible. Requiring every physical model to specify its own power on sequence and power off sequence prevents problems from occurring when mounting and/or unmounting devices. This is a big concern in multi- tasking and multi-user env...