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Sajjjad, What is the reason for choosing not to use an external clock. (Usually: power, speed performance or academic curiosity.)

@Andrew Wright In our previous design, we controlled the word line, precharge/CLK, read enable, write enable using external signals. How can we control these functions from inside the memory using any block or circuitry that will also allow us to reduce the use of fewer external signals. Could you please help me with this please ?