Nand final

ssd

2025 Cal Poly EE/CPE senior project exploring nonvolatile flash storage. Includes a prototype design using an 8051 and small NOR flash IC and the final design with a modern Atmel microcontroller and multiple high-density NAND flash ICs on a custom PCB.

nand-final

2Gib NAND flash memory board with virtual serial interface over USB. Supports default and RAID 1 configurations.

Firmware Build and Flash Instructions (Linux)

# Install dependencies
sudo apt install gcc-avr avr-libc avrdude make

# Clone this repo
git clone https://github.com/IanFeldman/ssd.git
cd ssd/nand-final/firmware

# Burn fuses (first time only)
make fuses

# Compile and flash firmware using ISP
# (edit makefile as needed)
make [UART=1] [RAID=1] # Optionally enable UART debugging or RAID 1
make flash

UART debugging interferes with some NAND chip control lines. Enable it at your own risk.
RAID is performed across all 4 chips, so it decreases the address space fourfold.

Usage:

Plug PCB into PC USB port and open a terminal with:
screen /dev/[path-to-usb-device] -b 9600

Commands:

Note:

• [row] is three bytes and represents a page address. Max value: 0x0FFFFF (0x040000 with RAID enabled).
• [column] is two bytes and represents a page offset in bytes. Max value: 0x07FF.
• [data] is one byte.
• [size] is a decimal unsigned integer.

nor-prototype-2

Prototype breadboard 512kB flash memory storage device. Interface over UART at 9600 baud. Compile with SDCC and program with avrdude. See hardware schematic for hardware details.

Firmware Build and Flash Instructions (Linux)

# Install dependencies
sudo apt install sdcc

# Clone this repo
git clone https://github.com/IanFeldman/ssd.git
cd ssd/nor-prototype-2/firmware

# Compile and flash firmware using ISP
make
./program.sh

Usage:

Connect a serial cable to RXD and TXD on the microcontroller. Open a terminal with:
screen /dev/[path-to-serial-cable] -b 9600

Commands:

• Read an address r[address]
• Erase an address e[address]
• Program an address p[address][data]

Where:

• [address] is 3 hex bytes
• [data] is one hex byte

nor-prototype-1

Flash memory controller prototype.