71 TT7 Simple Clock
71 : TT7 Simple Clock
- Author: Joseph Hsu
- Description: This is a very simple, configurable clock. By default it's 20 MHz, but it can be configured to 10/12/14 Mhz.
- GitHub repository
- Clock: 20000000 Hz
How it works
So this clock is configured off of the FPGA clock at 20 MhZ. However, the clock is configurable to different frequencies and settings.
How to test
See if the clock works. The first, second, and third switches should speed up/slow down the clock, which can be used to set the clock. The fourth switch is used to go to arduino mode. The fifth, sixth switches should allow you to switch between the minutes display and the hours display respectively. The seventh switch should allow you you to run the clock in 4 segment display mode.
External hardware
PMOD 2 segment display, possible 4 segment
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | |||
| 1 | Clock Option - 10 MHz | ||
| 2 | Clock Option - 12 MHz | ||
| 3 | Clock Option - 14 MHz | ||
| 4 | Arduino Mode | ||
| 5 | Minute Display | ||
| 6 | Hour Display | ||
| 7 | 4 Digit Mode |