José G. Delgado-Frias

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Piece-wise first- and second-order approximations are employed to design commonly used elementary function generators for neural-network emulators. Three novel schemes are proposed for the first-order approximations. The first scheme requires one multiplication, one addition, and a 28-byte lookup table. The second scheme requires one addition, a 14-byte(More)
In this paper we introduce a VLSI priority encoder that uses a novel priority lookahead scheme to reduce the delay for the worse case operation of the circuit, while maintaining a very low transistor count. The encoder's topmost input request has the highest priority ; this priority descends linearly. Two design approaches for the priority encoder are(More)
This paper describes a novel reconfigurable architecture for digital signal processing (DSP). The architecture consists of a two-level array of cells and interconnections. DSP algorithms are divided into 4-bit units and mapped onto the first level of cells. Each cell uses a 4x4 matrix of small elements to implement the basic operations required by the(More)
This paper describes a new approach to implement Dynamically Allocated Multi-Queue (DAMQ) switching elements using a technique called "self-compacting buffers". This technique is efficient in that the amount of hardware required to manage the buffers is relatively small; it offers high performance since it is an implementation of a DAMQ. The first part of(More)
In this paper we present a study of a prefix routing cache for Internet IP routing. An output port assignment requires one cache memory access when the assignment is found in cache. The cache array is divided into sets that are of variable size; all entries within a set have the same prefix size. The cache is based on a ternary content addressable memory(More)
—The content addressable memory (CAM) is a memory in which data can be accessed on the basis of contents rather than by specifying physical address. In the paper, five novel dynamic ternary CAM cells with decoupled match lines are presented. A ternary CAM cell is capable of storing and matching three values: zero (0), one (1), and don't care (X). The(More)