 Output logic macrocell with enhanced functional capabilities |
| This invention provides an output logic macrocell for use with a logic block such as a programmable ... |
|
| Graphics system including an output buffer circuit with controlled Miller effect capacitance |
| Generally, and in one form of the invention, an integrated circuit buffer includes a source ... |
|
| Safestore frame implementation in a central processor |
| What is claimed is: 1. In a central processor including: A) data manipulation means for performing ... |
|
| Refresh control for dynamic memory in multiple processor system |
| In accordance with one embodiment of the invention, a computer system employs three identical CPUs ... |
|
| System and method for providing a fault tolerant computer program runtime support environment |
| The present invention automatically converts a non-fault tolerant software program into a fault-... |
|
| Multiple processor synchronized halt test arrangement |
| An object of this invention is to provide a stable testing and debugging environment for a ... |
|
| High-availability computer system with a support logic for a warm start |
| It is an object of this invention to control the assignment of the logic processors to operating ... |
|
| Redundant read bus for correcting defective columns in a cache memory |
| Generally, the present invention relates to efficiently implementing column redundancy in a cache ... |
|
| Plural sensor monitoring and display device |
| We claim: 1. In a monitoring device for monitoring the outputs of a plurality of sensors and ... |
|
| Fault diagnostic distributed processing method and system |
| It is an object of the present invention to provide a distributed processing system which resolves ... |
|
|
Control module for reducing ringing in digital signals on a transmission line
| Details |
Inventors: Peterson, LuVerne R.;
Assignee: Unisys Corporation (Blue Bell, PA)
Primary Examiner: Hudspeth; David R.
Assistant Examiner:
Attorney, Agent or Firm: Fassbender Charles J., Starr; Mark T., Weinstein; Stanton D.
An electronic control module reduces ringing in the digital signals on a transmission line which has multiple transmitters, receivers, and parasitic inductors and capacitors coupled to the line. Preferably, a copy of this control module is provided at each node on the line which has a transmitter and/or receiver. Each copy of the control module has three main parts--a sensing circuit, a pulse generating circuit, and a switching circuit. The sensing circuit is coupled to the transmission line, and it generates a control signal when the digital signal on the transmission line changes from a low voltage to a high voltage. The pulse generating circuit receives the control signal and responds by generating a single pulse. The switching circuit receives the pulse and, in response, couples a high supply voltage to the transmission line while the pulse occurs. |
|
DETAILED DESCRIPTION In accordance with the present invention, an electronic control module is provided that reduces ringing in the digital signals on a transmission line which has multiple transmitters, receivers, and parasitic inductors, resistors, and capacitors coupled to the line.
Preferably, a copy of this control module is provided at each node on the line which has a transmitter and/or receiver.
Each copy of the control module has three main parts--a sensing circuit, a pulse generating circuit, and a switching circuit.
The sensing circuit--a) has an input coupled to the transmission line, b) senses when the digital signal on the transmission line changes from a low voltage to a high voltage, and c) generates a control signal to indicate that change.
The pulse generating circuit--a) has an input which receives the control signal, and b) responds to the control signal by generating a single pulse.
The switching circuit--a) has an input which receives the pulse, and b) an output which couples a high supply voltage to the transmission line while the pulse occurs.
This coupling of the supply voltage to the line, by each control module, substantially reduces ringing--even when the transmission line voltage changes from low to high very quickly.
|
|
CPUs 
