971 DDR throughput and flop aperature test
971 : DDR throughput and flop aperature test
- Author: Eric Smith
- Description: Grab data on every edge of clock with varying pos pulse width
- GitHub repository
- View in Wokwi
- Clock: 0 Hz
How it works
Badly probably.
Use a positive edge detector on the clock and its compliment. Or together those dectors to get 2 positive pulses per period or a 2x clock. Vary clk 2x pos pulse width by varying number of inv per detect.
How to test
Carefully.
External hardware
Analog Discovery 3
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | pulse = 1 inv | q for pulse = 1 inv | |
| 1 | pulse = 3 inv | q for pulse = 3 inv | |
| 2 | pulse = 5 inv | q for pulse = 5 inv | |
| 3 | pulse = 7 inv | q for pulse = 7 inv | |
| 4 | q for normal flop | ||
| 5 | 1 | ||
| 6 | 1 | ||
| 7 | clk |