Alcor AU6989 USB 2.0 flash drive (Anguo)

After completing the verification,

I tried designing a USB flash drive board as a practice

project for a four-layer board. The background
was a chemistry class during a winter day in my senior year of high school. Looking at the blackboard full of writing, I was dozing off, so I secretly took out my phone and opened Taobao to see what interesting things I could find.
Suddenly, my eyes lit up: Lao Wang's new CBM2098S USB flash drive controller board, only 0.5 yuan each! I was overjoyed, thinking that making some USB flash drives myself would be a lot of fun. My balance dropped by 55 yuan. The
board arrived, and upon opening the package, I felt a wave of disappointment. It was just a TSOP48 flash memory socket. Besides the CBM2098S, there was another controller: AU6989SNHL-GT.
Nowadays, BGA flash memory chips are more common, and this TSOP48 was a real problem. TSOP48s are also quite difficult to solder. I salvaged a flash memory from an old set-top box and made a 128MB USB flash drive. With the college entrance exam approaching, I lost interest in it.
After the college entrance exam, I stumbled upon the LCEDA software. I tried it out on some simple boards and found it very useful, giving this hopeful
but hopeless user, who had downloaded and deleted AD three times, a glimmer of hope. On July 1st, JLCPCB provided a free 4-layer board prototype. I knew it was time to fulfill my unfulfilled wish, so I worked through the night to design the circuit. After several revisions and prototype tests, I finally had a usable main control board.
Project Overview:
A USB flash drive main control board (PCBA) based on the Alcor AU6989, with a minimal design, minimal external circuitry, and support for VCCQ 3V3 flash memory.

Support for the main controller
requires soldering a crystal oscillator (pins 9 and 10 are crystal oscillator pins, design your own). Are these main controllers still available? (
AU698X series ,
AU699X series


do not require a crystal oscillator
, AU6989SN-GT series




theoretically supports NAND Flash types (please refer to the firmware for a specific model support list):
BGA132 SLC/MLC/TLC/QLC
, BGA136 SLC/MLC/TLC/QLC,
BGA152 SLC/MLC/TLC/QLC,
maximum 2CH 4CE or 1CH 8CE. )



Update Log:

V1.4
Refactored routing, PCB layout
verification successful.


V1.3
Verification completed, successful card opening.
(My board design is terrible, got scolded, redrawing, sob sob.)
Low quality USB A connector, I love you!!!


V1.2
verification was successful, but a problem occurred
: the computer blue-screened upon power-up due to a reversed USB data cable connection (
after using a jumper cable, the drive was recognized, but the flash memory was not)


. V1.1
updated the BGA152 pads, using a simplified design
with the controller using an angled design, temporarily removing the crystal oscillator circuit
and adding support for Samsung 27nm jumpers SB1.




V1.0
completed the design, but prototype production
verification failed due to a problem.



The card opening software settings for the
mass production tool version: ALCOR_U2_MP_v19.04.01.00.
The default configuration is fine; please search for the software yourself on Baidu.