CLB Bus Interface Macro for Flexible Partial Reconfiguration
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Solution Overview
Problem
Current programmable logic devices (PLDs) face limitations in dynamically reconfigurable designs due to the scarcity of three-state buffer (tbuf) macros, which restrict the number of reconfigurable modules and the design interface, as tbufs can only handle a fixed number of signals and must be placed at the boundary of reconfigurable modules.
Innovation Solution
A versatile bus interface macro is introduced, utilizing a single slice of a configurable logic block (CLB) that can be placed anywhere within a reconfigurable module, allowing for more optimal placement and increased usage of logic interface macros, thereby enhancing the design of dynamically reconfigurable modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three-state buffer (tbuf) macros are used as interfaces for reconfigurable modules, then the interface can be established, but the number of available interface signals is limited and tbuf resources are scarce
Solution Approach 1:
The patent applies universality by making the interface macro capable of multiple functions. Instead of using dedicated three-state buffer macros that can only perform buffering, the invention creates a universal interface macro that can function as a buffer, a logic gate, or other logic functions depending on configuration. This allows the same macro structure to serve multiple purposes, increasing interface signal capacity without requiring additional specialized tbuf resources.
Solution Approach 2:
The patent applies parameter changes by making the interface macro programmable and reconfigurable. The macro's behavior can be changed by loading different configuration data, allowing it to transform from a simple buffer to various logic functions. This dynamic parameter change enables the interface to adapt to different signal requirements and increases the effective number of interface signals available.
2Ease of operation
If tbuf macros are placed at the boundary of reconfigurable modules, then the interface is established, but placement flexibility is restricted
Solution Approach 1:
The patent applies dynamics by making the interface macro placement dynamic rather than static. The interface macro can be positioned anywhere within the reconfigurable module's implementation area, and its function can be changed through configuration. This dynamic approach eliminates the constraint of fixed boundary placement, allowing optimal placement for routing and performance while maintaining ease of operation.
Solution Approach 2:
The patent applies segmentation by separating the interface macro from the traditional boundary constraint. Instead of being tied to the module boundary, the interface macro is segmented as an independent configurable element that can be placed within the implementation area. This segmentation provides placement flexibility while reducing design complexity by allowing the macro to be positioned where it best serves the routing needs.
3Adaptability or versatility
If a fixed number of signals are handled by tbuf macros, then the interface is simplified, but the design of the reconfigurable module interface is restricted
Solution Approach 1:
The patent applies dynamics by making the interface macro's signal handling capacity dynamic. The macro can be configured to handle different numbers and types of signals based on the reconfigurable module's needs. This dynamic signal handling increases interface design freedom while managing complexity through a single configurable macro rather than multiple fixed-function macros.
Solution Approach 2:
The patent applies universality by creating an interface macro that can handle multiple signal types and configurations. The same macro structure can serve as a buffer for single signals, implement logic functions for multiple signals, or be configured for different data widths. This universal approach increases interface design freedom while keeping the macro structure relatively simple.
Data Source
AI summary
Method and apparatus for module design in a PLD is described. In one example, a PLD includes a reconfigurable module, a static module, and at least one logic interface macro. The reconfigurable module includes a signal interface and is configured for active partial reconfiguration. The static module includes a signal interface. Each logic interface macro includes first pins coupled to the signal interface of the reconfigurable module and second pins coupled to the signal interface of the static module. The first pins and the second pins are disposed in an implementation area of the reconfigurable module. In one embodiment, each logic interface macro includes a slice of a configurable logic block (CLB). In some embodiments, each logic interface macro is implemented using another type of logic block, such as a block RAM and/or multiplier block.