Visualise SPI command bytes and check voltage, interface and chip-select assumptions.
Guided setup
Select SPI and enter command 9F with response bytes.nDecode bytes in transfer order.nSet clock waveform and inspect timing.nValidate the controller against a 3.3 V microSD module.
Expected observations
SPI is full-duplex and has no address byte.nChip-select boundaries and mode are required to interpret a real trace.nA bare microSD interface is not 5 V tolerant.
Checkpoints
Check
Expected
Evidence
Command
0x9F listed before response bytes
DecodernClock
Fault injection
Fault
Symptom
Corrective action
All FF
Device not selected or MISO floating
Check CS, power and modenShifted bits
Generate, measure, decode
Virtual Hardware Bench Pro
Use one reusable browser bench for signal generation, virtual measurement, protocol decoding and electrical board-to-module compatibility checks. All calculations run locally.
