vivado2018.3 how to save the fifo depth ?

[peking428@163.com]

Why can't modify the fifo depth ?

When I changed the fifo depth from 64 to 128, i can't save this modify, the OK can't type 

[nathanx · Accepted solution]

Is the FIFO IP locked? Can you generate a new FIFO IP in the project? 

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[peking428@163.com]

yes，locked。i creat a new IP