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hello friends welcome back to my Channel today we are going to discuss about a very commonly asked interview question that is how to calculate the depth of an earth synchronous FIFO and a synchronous FIFO is used to transfer data from a module working at very high frequency to the module working at very low frequency let us see how to calculate the depth of an asynchronous rifle let us suppose we have two modules in a system module a and module B module is working at very low frequency and Mahdi will be working at comparatively high frequency both our modules have separate transmit and receive channels module a task with data to model B on its transmit channel and see data from what will be honest receive channel similarly module B transmits data to model a on start with child and achieve data from module a on his seizure when module they transmit data to module B our writing speed is very slow but our reading speed is very high so we need not to have any memory buffer between the two modules but because both the modules are working at different clock frequency as per clock domain crossing we need to have some sort of clock synchronized between the two modules but when Mahdi will be transmits data to module a our writing speed is very high as compared to our reading speed so we need some sort of memory buffer or a synchronous FIFO in the middle but let me clarify one thing data should not be continuous it should be in the form of bus because if my data is continuous at one point of time my asynchronous pfeiffer will become full and we will lost all the data thereafter moreover there should be minimum bus to bust gap so that module they should get sufficient time to read complete rifle now the next questions comes what should be the depth of a FIFO let us try to understand by taking an example let us suppose module a is working at clock frequency FA which is equal to 20 megahertz and what you will be is working at frequency F B which is equal to 200 Mellors quite higher than Fe and it is offered in the form of bursts having size of equal to hundred bytes know from the above data we can easily calculate time taken to write one data byte which is equal to time period of clock at B which is 1 by a B and FB is equal to inner megahertz so which becomes 5 nano second that means in 5 nano second we can write one data byte now time taken write a complete bust which will be equal to burst size into time taken to write one data byte beside is 100 and time taken to write one data by these 5 nanoseconds so which we comes 5 nano second that means in 500 nano second we are able to write complete worst now let us see on the real side time taken to read one data byte which is equal to time period of clock frequency FA which is 1 by F a and F a 20 megahertz which becomes 50 nano second that means in 50 nano second we are able to read one data byte and now let us compute the data read during the bust writing so we are able write burst in 5 min and a second divided by 50 nano second which without stem so that means during the right time we are able to read ten bytes what is a buffer size mavar size will be equal to burst size - data read during the bus right beside is 100 and during the bust we are able to read 10 bytes so our bombers eye v90 now let us calculate what should be the minimum worth to bust gap because 90 bytes are left to be racked by module a and this 90 bytes are stored in a file so we need 90 more clocks Huygens to read these 90 bytes from phifer so 90 into clock period of FA which is 50 nanoseconds so there is minimum requirement of 4,500 nanosecond as a bus to burst yep friends I'm giving this question to you for exercise in this writing frequency FB is equal to 80 megahertz reading frequency F phase 50 meters and burst size is equal to 120 you have to calculate minimum 5 for depth a minimum bus to bust gap please share your answer in the comment section below there only I will reply to your answer whether it is correct or not with this I am going to close this session but we will continue with another session wherein we will include some idle cycles during write and read please subscribe our channel and pass the bell icon to have the notification thank you so much for watching