Test Software and Setup Information for DILVERT ASIC
The DILVERT Cold Board must be supplied with power, START/STOP signals, and digital control/communications.
Digital control and communications is handled by an Arduino. The Arduino must also get a TRIGGER signal when STOP arrives at DILVERT. At each TRIGGER, the Arduino will read out the TDC result from DILVERT, and stream it over serial to the lab PC. DILVERT_HAL_Interface.py will capture this streamed data and write it to a CSV file.
| DILVERT SIGNAL | LEVEL SHIFTER BOARD | SPARKFUN PRO MICRO | PORTENTA | HD CONN | BREAKOUT |
|---|---|---|---|---|---|
| S_DIN | P0.0 | 9 | PC7/D4 (1 from bot left) | J2-63 | PWM2 |
| S_CLK | P0.1 | 10 | PC6/D5 (0 from bot left) | J2-61 | PWM1 |
| S_PASS | P0.2 | 5 | 1 (PK1/D1) (4 from bot left) | J2-60 | PWM5 |
| S_LOAD | P0.3 | 4 | 2 (PJ11/D2) (3 from bot left) | J2-67 | PWM4 |
| RESET | P0.5 | 6 | 0 (PH15/D0) (5 from bot left) | J2-62 | PWM6 |
| S_DOUT | P2.5 | 8 | PG7/D3 (2 from bot left) | J2-65 | PWM3 |
| TRIGGER | 15 | 21 (PA4/D21) (6 from bot left) | J2-78 | A6 (?) |
| Voltage | Function | Reasonable Starting Value (based on sim) | Supply Pins (CRYO_ISOK63 Flange) |
|---|---|---|---|
| VDDIO | I/O Supply Voltage | +1.8 V | LS Board |
| VDD | Core Supply Voltage | +0.8 V | LS Board |
| VTUNE_N_FAST | Higher voltage makes NFETs in the fast chain go faster. | +1.9 V | J5-7 (SMUA CH3) |
| VTUNE_P_FAST | Lower voltage makes PFETs in the fast chain go faster. | +0.1 V | J5-5 (SMUA CH2) |
| VTUNE_N_SLOW | Higher voltage makes NFETs in the slow chain go faster. | +0.55 V | J5-11 (SMUB CH1) |
| VTUNE_P_SLOW | Lower voltage makes PFETs in the slow chain go faster. | +1.45 V | J5-9 (SMUB CH0) |
| VTUNE_N_RO | Higher voltage makes the NFETs in the ring oscillator go faster. | +1 V | J5-13 (SMUB CH2) |
| VTUNE_P_RO | Lower voltage makes the PFETs in the ring oscillator go faster. | +1 V | J5-3 (SMUA CH1) |
| NMOS_BG_BIAS | Biases NFETs in the digital domain. | +1 V | J5-15 (SMUB CH3) |
| PMOS_BG_BIAS | Biases PFETs in the digital domain. | -1 V | J5-1 (SMUA CH0) |
Qfine is always 100 or always 0?
- Check the bias voltages / connections. The fast chain and slow chain of the vernier must have significantly different bias voltages, or else the fast edge will never catch up to the slow edge, and you will see Qfine=100.
- Check the pulsewidths of START and STOP. The pulse must last long enough for the data to be latched by (READY & SC_PASS).
Python streaming software cannot open the port ("Permission Denied")?
- Is the Arduino Serial Monitor open? Arduino Serial Monitor and Python cannot access the same port at the same time.
Cannot program the Arduino Portenta (dfutils error)?
- Make sure the Portenta drivers are installed in the Arduino IDE.
- Make sure to run the Arduino IDE as an administrator.
- Double-press the reset button on the Portenta. You should see it switch COM ports in the Arduino IDE. Now you should be able to program it.