Error (170040): Can't place all RAM cells in design

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its mroe to do with how efficiently you use the memory. Unused parts of an M9K cannot be reused. an M9K has 1bit x 9K locations (or other conjugations of that, like 9bits x 1k)

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Hello,in my design I use M4K with the depth of 256 and the width of 13, but after fitter processing I saw in the "fitter ram summary" the so-called implentation depth of 256 and the implentation width of 2, where is the other 11 bits, so strange? Waiting the answer.Thank you!