Semiconductor Device Pad Layout for Timing Skew Reduction
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Solution Overview
Problem
Existing semiconductor devices face challenges in improving operational reliability and minimizing timing skew and current consumption, particularly in high-speed memory systems, due to uneven wiring lengths and increased parasitic capacitance in data input/output operations.
Innovation Solution
The semiconductor device incorporates a specific layout configuration for input/output pads on the I/F chip, where pads are arranged in two rows with a data input latch positioned between them, ensuring uniform wiring lengths and reducing parasitic capacitance, thereby minimizing timing skew and current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pads are arranged in a conventional single-row configuration, then the layout is simple, but wiring lengths become uneven causing timing skew and increased parasitic capacitance
Solution Approach 1:
The pad arrangement is segmented into two distinct rows (first row and second row) with pads positioned at different locations. This segmentation allows the data input latch to be positioned between the rows, creating uniform wiring paths and reducing timing skew while maintaining layout manageability.
Solution Approach 2:
The pad layout transitions from a conventional single-row arrangement to a two-row configuration, utilizing the vertical dimension of the chip layout. This dimensional change enables the data input latch to be positioned optimally between the rows, achieving uniform wiring lengths and reduced parasitic capacitance without significantly increasing overall layout complexity.
2Adaptability or versatility
If data line lengths are increased to reach distant pads, then pad placement flexibility improves, but parasitic capacitance increases and timing skew worsens
Solution Approach 1:
The two-row pad configuration creates local uniformity in wiring lengths by positioning pads at specific locations in each row. This local quality optimization ensures that data lines have consistent lengths from the data input latch to nearby pads, minimizing parasitic capacitance and timing skew while maintaining placement flexibility.
3Stability of the object's composition
If pads are positioned far from the data input latch, then pad distribution is improved, but wiring length increases causing timing skew
Solution Approach 1:
The two-row pad arrangement with the data input latch positioned between the rows creates equipotential wiring paths of uniform length. This configuration ensures that data lines to pads in both rows have substantially equal lengths, achieving timing uniformity while maintaining appropriate pad distribution across the chip.
Data Source
AI summary
A semiconductor device includes first input/output circuits for a first channel, first input/output pads corresponding to the first input/output circuits, respectively, wherein the first input/output pads are aligned along and extends in a first direction, second input/output circuits for the first channel, second input/output pads corresponding to the second input/output circuits, respectively, wherein the second input/output pads are aligned along and extends in a second direction, and an input circuit between the first input/output pads and the second input/output pads, and connected to a memory to which the input circuit inputs data from the first input/output circuits and the second input/output circuits. The input circuit is positioned such that a first line extending perpendicular to the first direction from one of the first input/output pads and a second line extending perpendicular to the second direction from one of the second input/output pads intersect a portion of the input circuit.