Abstract-Now days green computing is major research area in the computer science field, where we want to reduce the total power consumption of our device by applying different techniques .Having this concern we have designed our FIFO (First In First Out) circuit and calculated its total power dissipation at different-different families of SSTL with frequency scaling techniques. In this technique we used following (20 GHz, 40GHz, 60 GHz and 80 GHz ) frequency range. In our work first we have worked with SSTL12 and found that when we scaled down the frequency from 80 GHz to 20 GHz 71.55% reduction in total IO power. In second we have worked with SSTL15 and got 74.02% of reduction in total IO power when we reduced frequency from 80 GHz to 20 GHz. In last we worked with SSTL18_I and SSTL18_II and found 74.29% and 74.28% of reduction in total power respectively, when we scaled down the frequency from 80 GHz to 20 GHz. We have designed our FIFO on 28 nm kintex-7 FPGA family Keyword-SSTL IO standard, Low Power, Energy Efficient, 28 nm FPGA, FIFO I. INTRODUCTION FIFO abbreviates first in first out which is a kind of data structure to manage/organize and manipulate data or entries where the oldest entry will be accessed or processed first. In other words the entries will get preference in the order as they came.In data structure, this concept gets implemented as queue. The insertion, deletion or other operations get performed on the head or oldest data entry. As a CPU scheduling Algorithm, In First Come First Serve Algorithm FIFO get used in which CPU becomes available to those processes first which came first on the other hand FIFO disk scheduling also get used on this concept.Through FIFO, we get a fair processing and complexity level reduces to serve the processes but sometime this approach becomes inefficient (or time taking). As if the newest entry's process is very short and will take negligible amount of time comparatively then it have to wait for long time till the oldest one completes, then somehow efficiency of work get affected. Overall, this approach is too good if everything have to be done in sequential manner.
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