Hardware resources multiplexers

The cost function used in this phase is composed of three parts - the cost of conflicts (7), the cost of the hardware resources (/ t, / m. and 7 represent the cost for a tristate buffer, a multiplexer input and a register, respectively) and the potential cost (V ) of the current data path. A feasible solution is a design without conflicts (conflicts occur when two incompatible objects are bound to a hardware resource). The data path constructed by the constructive binding is guaranteed to be conflict free. However, an infeasible initial solution can also be accepted. Generally, / m, 7 cv, which means the objective is to find a feasible... 

Since the A3 80, the concept of integrated modular avionics has appeared. This concept reduces development costs for the manufacturer and operating costs for companies by communalizing the hardware resources of certain computers. Systems performing different functions use and share the same hardware resources (see Figure 6.10). This enables maximization of the utilization rate of these shared resources via the optimum installation of different systems on the resources. This is beneficial in terms of mass, volume and interface (for sharing of multiplexed interfaces such as digital buses between multiple systems). 

Synthesis results. The ECC was synthesized and mapped to cells in LSI Logic s LCAIOK library. Two experiments were performed to illustrate the effect of resource sharing. In the first experiment, the hardware resources implementing PARITY.3 and PARITY-4 were assumed to have small area cost. This assumption corresponds to the actual implementation of these resources based on their HardwareC description, e.g. PARITY 3 is a three bit XOR and PARITY-4 is a four bit XOR. In the second experiment, the area cost for these resources was increased ten-fold to demonstrate the case where the area reduction due to sharing resources outweighs the area increase due to multiplexers and latching registers. Synthesis results of these experiments are summarized in Table 11.9. 

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