Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Logic circuit generating method and apparatus










Image Number 3 for United States Patent #5745373.

A logic circuit generating method and apparatus generating logic circuits of a circuit system by minimizing the fan-out count of cells or cell macros constituting information specific to the circuit system. According to the method, a Boolean expression and the polarities of its input/output variables are input from a design master file of the apparatus. The Boolean expression is then transformed into a two-branch tree composed of nodes represented by the logical operators of that expression. In the two-branch tree, the nodes representing a parent and a child logical operator are converted into a single node, whereby a multiple-branch tree is generated. That is, a plurality of gates are connected to a single net, or signal line. A cell library is referenced so that cells are assigned initially to the multiple-branch tree thus obtained. The initial cell assignment is performed preferentially starting from the cell whose fan-out count is the largest. This is done to minimize the number of loads represented by the assigned cells (i.e., the number of cells connected to the output net). The number of gate stages is then evaluated. The stage count is minimized by reassigning the cells. Finally, the acquired gate logic is output to the design master file.








 
 
  Recently Added Patents
Bootstrap gate driver
Vehicle driving assistance apparatus
Display screen with graphical user interface
Semiconductor device manufacture in which minimum wiring pitch of connecting portion wiring layer is less than minimum wiring pitch of any other wiring layer
Redundant parallel operation of motor vehicle electrical system generators
Mobile device mode control based on dual mapping of availability (presence) information
Production of battery grade materials via an oxalate method
  Randomly Featured Patents
Location signaling for transport system
Master cylinders with rear exterior shell forming reservoir passage
Coated synthetic film materials
Insulation displacement contact and contacting device
Methods of, and apparatus for, synchronizing a receiver with a received signal
Screed system for walls
Remedies for multiple sclerosis
Ink jet recording medium
Interference measurement apparatus, interference measurement probe and interference measurement control system
Network print server with page-parallel decomposing