tz_secure_only_sd Directory Reference

Directory dependency graph for tz_secure_only_sd:

Directories
	src

Detailed Description

SPI-mode SD round trip: bring the card up, mount its FAT volume through ra8_fs, write a pseudo-random payload, read it back, compare byte for byte.

Needs a Digilent PMOD MicroSD (part 410-380) in Pmod2 (J25) with a FAT16 or FAT32 formatted card already in it. The demo never formats, and the HIL bench does not normally carry a card, so this usually cannot run unattended.

EK-RA8D2 pin	PMOD MicroSD signal	Net (UM Table 19 p 27)
Pmod2.1 P604	CS	SSLB0 (GPIO output)
Pmod2.2 P603	COPI	MOSIB (UM legacy name)
Pmod2.3 P602	CIPO	MISOB (UM legacy name)
Pmod2.4 P601	SCK	RSPCKB
Pmod2.5 GND	GND	GND
Pmod2.6 3V3	3V3	3V3

Chip select is claimed as a plain GPIO rather than the SCI's hardware CS, which pulses per byte; SD SPI mode needs CS held asserted across a whole multi-byte command frame (SD PHY spec v9 section 7.2.4). The bus opens at 400 kHz for card identification – the spec ceiling for that phase – and escalates once the card answers.