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Our Aim is to crate the RAM of 4M * 32

It actually represent that we should create the RAM having 4M entries each of 32 bits .

Now to construct this we have building block of 512 K  * 8 that is .. we have 512 K words each of 8 bits ...

But  as per requirement we should have 32 bits in one words so to have 32 bits we need 32/8 = 4

So one row needs 4 chips of 512K * 8 bits , so that we will have 512 K * 32 bits ..

So number of rows required = 4M * 32/ 512 K * 32 =  8 ROWS we need

As one row have 4 chips .. 8 rows will have 32 chips .

SO 32 CHIPS ARE NEEDED TO CREATE RAM OF 4M * 32 bits .

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