Binghamton                                                                                CS-220
   University                                                                            Spring 2019
                     Memory and Pointers
                                                                                             1
  Binghamton                                      CS-220
  University                                    Spring 2019
     Memory
     • Keeping track of something over time
     • A memory is stored at one point in time
     • A memory is retrieved at a later time
     • Computers remember information by 
      writing bits (1/0) to “memory”
     • We retrieve information by reading bits from memory
  Binghamton                                               CS-220
  University                                             Spring 2019
     Edge Triggered “Flip/Flop”
                                                 D   Clk Q
                                                          n
                                                 X   0   Q
                                                          0
                                                 X   1   Q
                                                          0
                                                 X  0→1  Q
                                                          0
                                                 D  1→0   D
  Binghamton                                      CS-220
  University                                    Spring 2019
     Registers –A series of Flip-Flops