A circuit design for a fieldprogrammable Analog Array is presented which improves accuracy and repeatability compared to previous designs. Controlled by a configuration register, continuous-time signals are routed am...
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A circuit design for a fieldprogrammable Analog Array is presented which improves accuracy and repeatability compared to previous designs. Controlled by a configuration register, continuous-time signals are routed among programmable analog blocks to implement the user's chosen circuit. The configurable connections are realized by CMOS switches and a new innovation is that these are either buffered or nulled to cancel parasitic error. The function blocks are Op-Amps combined with passive networks which allow programmable transfer functions with accuracy insensitive to variations in process parameters and environment. The intended application area is the rapid development of analog circuits which are presently prototyped by PCBs stuffed with Op-Amp and passive components. The concept has been demonstrated on a CMOS IC and the resulting performance shows the feasibility of this approach to general purpose FPAA technology.
This paper describes the architectural configuration of the Electrically programmable Analog Circuit (EPAC), an expert cell approach to meeting the market need for an analog counterpart to the digital FPGA. It provide...
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This paper describes the architectural configuration of the Electrically programmable Analog Circuit (EPAC), an expert cell approach to meeting the market need for an analog counterpart to the digital FPGA. It provides an overview of the technology and describes the internal operation of the first commercial EPAC devices.
This paper deals with the diagnosis of fieldprogrammable interconnect systems (FPIS) in which nets are connected through programmable switches arranged in grids. A hierarchical approach to diagnosis is proposed. The ...
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This paper deals with the diagnosis of fieldprogrammable interconnect systems (FPIS) in which nets are connected through programmable switches arranged in grids. A hierarchical approach to diagnosis is proposed. The conditions by which such process yields full diagnosis and the characteristics of the programming sequence, are fully proved. For a FPIS consisting of a k × k grid array, the number of tests is given by 4 + 4kn2, while the number of programming steps is 4nk + 1, where n is the dimension of a grid. The application of this technique to commercially available FPIS in FPGAs, is discussed.
A fieldprogrammable Analogue Array (FPAA) is presented based on switched capacitor technology. The chip allows true array programming of undedicated analogue cells. There is provision for internal signal-conditional ...
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ISBN:
(纸本)9780897917735
A fieldprogrammable Analogue Array (FPAA) is presented based on switched capacitor technology. The chip allows true array programming of undedicated analogue cells. There is provision for internal signal-conditional switching as part of the normal function of the array. With the presented chip it is possible to implement a very wide range of analogue signal processing functions such as data conversion, linear signal processing and non-linear functions. These functional configurations can be reconfigured and parameterised on the fly during concurrent signal processing. Very rapid prototyping of switched capacitor circuits is facilitated. The fieldprogrammable nature of the chip allows several markets/customers to be targeted simultaneously with obvious benefits in terms of both volume of sales and reduced time to market.
Conventional reconfigurable components have substantially more interconnect configuration bits than they strictly need. Using counting arguments we can establish loose bounds on the number of programmable bits actuall...
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ISBN:
(纸本)9780897917735
Conventional reconfigurable components have substantially more interconnect configuration bits than they strictly need. Using counting arguments we can establish loose bounds on the number of programmable bits actually required to describe an interconnect. We apply these bounds in crude form to some existing devices, demonstrating the large redundancy in their programmable bit streams. In this process we review and demonstrate basic counting techniques for identifying the information required to specify an interconnect. We examine several common interconnect building blocks and look at how efficiently they use the information present in their programming bits. We also discuss the impact of this redundancy on important device aspects such as area, routing, and reconfiguration time.
The proceedings contains 24 papers. Topics discussed include logic design, fieldprogrammablegatearrays, pipelined routing and scheduling, logic synthesis, architecture of special purpose structures, field programma...
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The proceedings contains 24 papers. Topics discussed include logic design, fieldprogrammablegatearrays, pipelined routing and scheduling, logic synthesis, architecture of special purpose structures, fieldprogrammablegatearrays partitioning, applications and bit-serial synthesis.
A methodology is presented for production-time testing of segmented channel fieldprogrammablegatearrays (FPGA). The principles of this methodology are based on configuring the uncommitted modules of the FPGA as a s...
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ISBN:
(纸本)9780897917438
A methodology is presented for production-time testing of segmented channel fieldprogrammablegatearrays (FPGA). The principles of this methodology are based on configuring the uncommitted modules of the FPGA as a set of disjoint one-dimensional arrays similar to iterative logic arrays (ILA). These arrays are tested by establishing appropriate conditions such as constant testability. A design approach is then proposed. This approach is based on adding a small circuitry between each pair of uncustomized modules in a row for establishing the ILA configuration as a one-dimensional unilateral array. Features such number of test vectors and hardware requirements are also analyzed.
A novel field-programmable mixed-analog-digital array (FPMA) is proposed, which contains a field-programmable analog array, a field-programmable digital array, and a mixed-signal interface. This device is intended to ...
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A novel field-programmable mixed-analog-digital array (FPMA) is proposed, which contains a field-programmable analog array, a field-programmable digital array, and a mixed-signal interface. This device is intended to be used for the rapid implementation of mixed-signal circuits. The resource and architectural requirements for this array are determined by analyzing a set of sample circuits. The mixed-signal interface is constructed from converter blocks that contain configurable A/D and D/A converters, which gives some flexibility in the specification of the interface. A 1.2 μm CMOS prototype IC has been designed to demonstrate the feasibility of FPMA technology.
Area-IO provide a way to eliminate the IO bottleneck of fieldprogrammable logic devices (FPLDs) created the mismatch between the ability of perimeter bonds to provide IO and the propensity of logic to demand it. Whet...
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ISBN:
(纸本)9780897917438
Area-IO provide a way to eliminate the IO bottleneck of fieldprogrammable logic devices (FPLDs) created the mismatch between the ability of perimeter bonds to provide IO and the propensity of logic to demand it. Whether the incorporation of area IO into FPLD architectures has undesirable side effects is a question that has not yet been answered. In this paper, we examine the architectural impact of area-IO on FPLDs from a theoretical and experimental standpoint and show that the introduction of area IO generally improves the routability and delay of a set of benchmark circuits.
As the capacities of FPGAs grow, it becomes feasible to implement the memory portions of systems directly on an FPGA together with logic. We believe that such an FPGA must contain specialized architectural support in ...
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As the capacities of FPGAs grow, it becomes feasible to implement the memory portions of systems directly on an FPGA together with logic. We believe that such an FPGA must contain specialized architectural support in order to implement memories efficiently. The key feature of such architectural support is that it must be flexible enough to accommodate many different memory shapes (widths and depths) as well as allowing different numbers of independently-addressed memory blocks. This paper describes a family of centralized field-Configurable Memory architectures which consist of a number of memory arrays and dedicated mapping blocks to combine these arrays. We also present a method for comparing these architectures, and use this method to examine the tradeoffs involved in choosing the array size and mapping block capabilities.
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