nand2/03_Sequential_Logic

03 Sequential Logic

Build sequential chips Bit , Register and PC, that make use of the data flip flop (DFF) to store the state. DFF is considered primitive, so it's not necessary to implement it. The memory chips RAM512 and RAM3840 are based on the primitive RAM256, which uses block ram structures integrated in iCE40HX1K. BitShift9R and BitShift8L are new chips not explained in the original nand2tetris course. They serve to connect HACK to different IO-Devices, which are connected using a serial protocol, where data is transmitted bitwise.

blinky

The folder 08_blinky contains a project to test the counter PC in real hardware. Blinky uses counters PC to scale down the frequency of 100MHz provided by the clock oscillator on iCE40HX1K-EVB and finally drives the LED1/2.

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Project

• Implement the chips Bit, Register, PC, RAM512, RAM3840, BitShift9R and BitShift8L using DFF as primitive building block.

• Implement the chips RAM512 and RAM3840 using RAM256 as primitive building block.

• for every chip we provide a test bench in the dedicated folder.

  $ cd <test folder>
  $ apio clean
  $ apio sim
  

• Run blinky in simulation

  $ cd 06_blinky
  $ apio clean
  $ apio sim
  

• Zoom in to check the prescaler:

  

• Zoom out to check the counter:

  

• Upload the project to iCE40HX1K-EVB end test in real hardware:

  $ cd 06_blinky
  $ apio clean
  $ apio upload
  

• Look at LED1/2 and see if they blink.