摘要:
The invention relates to a delay calculation method for wiring nets of an electronic circuit, wherein a net within an electronic circuit comprises a driver pin (P0; P30) and a receiving pin (P1-P19; P32-P42) being coupled by at least one loop (40, 50; 60, 70, 80), said loop (40, 50; 60, 70, 80) comprising a first branching path (BP40a, BP50a) and a second branching path (BP40b, BP50b) electrically parallel to said first branching path (BP40a, BP50a), wherein at least a first and a second branching point (I, OP10; P30, OP1, P42) connect said branching paths (BP40a, BP40b; BP50a, BP50b). The method comprises the steps of disconnecting each branching path (BP40a, BP40b; BP50a, BP50b) once at a time at a specific point in said at least one loop (40, 50; 60, 70, 80) which connects a driver to at least one specific receiving pin (P1-P19; P32-P42); calculating a delay value of a signal connection between said driver pin (P0; P30) and each of said receiving pin (P1-P19; P32-P42) for each of said disconnected branching paths (BP40a, BP40b, BP50a, BP50b) of each loop (40, 50; 60, 70, 80); storing maximum and/or minimum calculated delay values; and applying at least one of said delay values for static timing analysis of the electronic circuit.
摘要:
The present invention relates to a method and respective system for operating a DRAM main memory. One buffer line is provided for multiple pages. When writing data to the buffer it is decided which to which buffer-line the data is written to based on its destination main memory address. A tuple consisting of lower memory address and data is stored. Data entered into the buffer-line will be sorted by page in case the line is flushed to the main memory. Sorting the buffer entries results in less page openings and closings, since the data is re-arranged by memory address and therefore in logical order. By using one line for multiple pages only a fraction of memory of a common set-associative cache is needed, thus decreasing the amount of overhead significantly.
摘要:
A signal repowering chip comprises an input; at least one inverter connected in series to the input; and at least one switch connected to a test enable signal, the at least one switch configured to allow a signal connected to the input to propagate through the at least one inverter in the event that the test enable signal is on. A 3-dimensional integrated circuit comprises a first chip, the first chip comprising a default voltage level and a plurality of wiring layers; and a second chip, the second chip comprising at least one repeater, the repeater being connected to the default voltage level.
摘要:
A design structure for an integrated circuit including a first wire of a first level of wiring tracks, a second wire of a second level of wiring tracks, a third wire of a third level of wiring tracks, and a fourth wire located a first distance from the second wire in the second level of wiring tracks. A first via connects the first and second wires at a first location of the second wire. A second via connects the second and third wires at the first location, the second via is substantially axially aligned with the first via. A third via connecting the third and fourth wires at a second location of the fourth wire. A fourth via connecting the first and fourth wires at the second location, the fourth via is substantially axially aligned with the third via. The second, third, and fourth vias, and the third and fourth wires form a path between the first and second wires redundant to the first via.
摘要:
Disclosed is a method that predicts test yield for a semiconductor product, prior to design layout. This is accomplished by applying a critical area analysis to individual library elements that are used to form a specific product and by estimating the test yield impact of combining these library elements. For example, the method considers the test yield impact of sensitivity to library element to library element shorts and the test yield impact of sensitivity to wiring faults. The disclosed method further allows die size growth to be traded off against the use of library elements with higher test yield in order to provide an optimal design solution. Thus, the method may be used to modify library element selection so as to optimize test yield. Lastly, the method further repeats itself at key design checkpoints to revalidate initial test yield (and cost) assumptions made when the product was quoted to a customer. Thus, the method provides increased accuracy of test yield estimate from initial sizing through design and further allows designs to be modified to improve test yield.
摘要:
Disclosed is a method and system for inserting redundant paths into an integrated circuit. Particularly, the invention provides a method for identifying a single via in a first path connecting two elements, determining if an alternate route is available for connecting the two elements (other than a redundant via), and for inserting a second path into the available alternate route. The combination of the first and second paths provides greater redundancy than inserting a redundant via alone. More importantly, such redundant paths provide for redundancy when congestion prevents a redundant via from being inserted adjacent to the single via. An embodiment of the method further comprises removing the single via and any redundant wire segments, if all of the additional vias used to form the second path can be made redundant.
摘要:
A signal repowering chip comprises an input; at least one inverter connected in series to the input; and at least one switch connected to a test enable signal, the at least one switch configured to allow a signal connected to the input to propagate through the at least one inverter in the event that the test enable signal is on. A 3-dimensional integrated circuit comprises a first chip, the first chip comprising a default voltage level and a plurality of wiring layers; and a second chip, the second chip comprising at least one repeater, the repeater being connected to the default voltage level.
摘要:
A computer readable medium, system and associated method is provided for designing an integrated circuit with inserted loops. The method comprises the steps of inserting a loop with tagged wire segments and/or vias in a fully routed and DCR clean integrated circuit; performing a DRC; and fixing DRC violations by removing tagged wire segments and/or vias which contribute to a violation.
摘要:
A method for rerouting a wire in an integrated circuit includes determining a wire coupling a first circuit element to a second circuit element is experiencing capacitive coupling effects with one or more other wires; removing the wire from a netlist; dividing the structure into a routing grid; defining a first and second wire types; associating a penalty with each wire type; determining all possible paths through the routing grid between the first circuit element and the second circuit element; determining a weighted length for each path; and selecting the path having the lowest weighted length.
摘要:
A design structure for reducing coupling between wires of an electronic circuit is proposed, wherein sets of nets are classified according to their coupling characteristics, and spacing between wires assigned to the sets of nets is chosen according to the coupling characteristics.