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The development of multiple Discrete Multitone (DMT) Digital Subscriber Line (DSL) flavors on a single platform can benefit considerably by a programmable architecture, which feature Digital Signal Processors (DSP) and Field Programmable Gate Arrays (FPGA), especially when fast prototyping is targeted. However, the flexibility assumed to be offered by algorithmic partitioning does not automatically and proportionally simplify the digital signal processing algorithms, unless the effects of overflow/saturation in intermediate processing stages are carefully studied. The effects of overflow/saturation in intermediate stages is very critical throughout the design process, since the operations involved are nonlinear in nature and affect the most significant bits of the computational process. This paper presents an efficient soft-core implementation of a Block Floating Point FFT (BLFP) algorithm, designed for a Very high-speed DSL (VDSL) DMT systems and for the full variety of other xDSL DMT flavors, as the latter demand an extended dynamic range to achieve performance that may otherwise be only warranted by costly floating-point chip implementations.