Programmable Interconnect Element With Selective Signal Registration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Long-distance interconnects in integrated circuits lead to reduced clock speeds due to settling time issues, and conventional methods to improve speed come with drawbacks such as increased area and delay overhead.
Innovation Solution
A programmable interconnect element comprising multiplexers and registers that enable selective registration and time-multiplexing or pipelining modes to optimize signal transfer, reducing delay and area overhead while maintaining high clock speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If long-distance interconnects are used in integrated circuits, then the circuit can cover larger area and connect more elements, but the clock speed is reduced due to settling time issues
Solution Approach 1:
The interconnect is divided into multiple segments with registration points (multiplexers and registers) inserted along the signal path. Each segment handles a shorter distance, allowing the signal to settle at each registration point before being forwarded, thus enabling long-distance transmission while maintaining high clock speeds.
Solution Approach 2:
Registration points are strategically placed along the interconnect path to perform preliminary signal settling and buffering before the signal reaches the destination. This preliminary action at intermediate points prevents the entire long interconnect from becoming a bottleneck, enabling the circuit to operate at higher clock speeds despite the long overall distance.
2Speed
If conventional registration methods are used to improve clock speed, then the clock speed increases, but the area overhead and delay increase
Solution Approach 1:
The registration points are designed as multi-functional elements that can operate in different modes (transparent mode for high-speed routing, registered mode for timing control, and time-multiplexed mode for resource sharing). This universality allows a single registration point to serve multiple purposes, reducing the total number of registration points needed and thus reducing area overhead while maintaining clock speed improvements.
Solution Approach 2:
The registration points are made dynamically configurable, allowing the circuit to switch between transparent and registered operation based on the specific timing and routing requirements of different signal paths. This dynamic adaptability enables the circuit to achieve high clock speeds only where needed, minimizing the area overhead associated with registration while still improving performance where required.
3Speed
If conventional registration methods are used to improve clock speed, then the clock speed increases, but the delay overhead increases
Solution Approach 1:
Instead of registering every signal path, the invention selectively applies registration only to the specific paths and segments where timing control is actually needed. This partial action approach maintains high clock speeds by adding registration overhead only where necessary, rather than uniformly across the entire interconnect structure, thus minimizing delay overhead while still achieving the desired speed improvement.
4Ease of operation
If dedicated non-registered connections are made for each interconnect, then the circuit switching is simplified, but the settling time increases and clock speed is reduced
Solution Approach 1:
The dedicated non-registered connection is segmented into multiple shorter segments with registration points inserted at strategic locations. Each segment remains relatively simple to control, but the intermediate registration points break up the long settling time of the original single connection, enabling higher clock speeds while maintaining the simplicity of dedicated circuit switching.
Solution Approach 2:
Registration points are introduced as intermediary elements between the source and destination of long interconnects. These intermediaries buffer and settle the signal at intermediate stages, reducing the overall settling time of the dedicated connection while maintaining the simplicity of circuit switching. The intermediaries act as mediators that enable faster operation without complicating the switching logic.
Data Source
AI summary
A programmable interconnect element for an integrated circuit device is described. The programmable interconnect comprises a first selection circuit coupled to a plurality of input lines and having a first output; a register having a first input coupled to the first output; and a second selection circuit enabling the selection of a value at the first output or a value stored by the register. A method of implementing a programmable interconnect element is also disclosed.