Re: RAM16k

Posted by WBahn on Jul 03, 2024; 1:00am
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/RAM16k-tp4030222p4037974.html

guerraTron wrote

Greetings to all,

<p>referring to the same topic in the interface of the RAM16K.hdl file appears:  </p>

<code>...
CHIP RAM16K {
 IN in[16], load, address[14];
...</code>

<p>I think the "address" entry should contain 15 bits, not 14</p>

Why do you think it should contain 15 bits?

Would you agree that a 1-bit address space can address 2 RAM cells (addresses 0 through 1)?
Would you agree that a 2-bit address space can address 4 RAM cells (addresses 0 through 3)?
Would you agree that a 3-bit address space can address 8 RAM cells (addresses 0 through 7)?

Would you agree that the pattern that is emerging is that an N-bit address space can address 2^N RAM cells (address 0 through 2^N - 1)?

So how many RAM cells are in a 16K RAM?

How many bits are needed to address that many cells?