YiXingDianZi MDSO

YiXingDianZi MDSO

Status	in progress
Channels	2
Samplerate	48MHz
Analog bandwidth	20MHz
Vertical resolution	8bit
Triggers	none (SW-only)
Input impedance	1MΩ‖25pF
Memory	none
Display	none
Connectivity	USB

The YiXingDianZi MDSO is a USB-based, 2-channel oscilloscope with an analog bandwidth of 20MS/s and 48MS/s sampling rate.

It comes in very compact plastic case (82x65x23mm) without any branding. It has:

• usb type B input
• 2c BNC inputs
• red led

See YiXingDianZi MDSO/Info for more details (such as lsusb -v output) on the device.

Hardware

• Cypress FX2LP CY7C68013A-56PVXC (USB 2.0 HS controller)
• ADC: Analog Devices AD9288
• EEPROM: Microchip 24LC64I (64K I²C EEPROM)
• 2x ST 74HC4051 (8-Channel Analog Mux)
• Crystal oscillator 24MHz (crystal)
• 4x 145 MHz FastFET Op Amp: Analog Devices AD8065 (top markings HRA)
• unmarked DC/DC converter
• 3.3V LDO: AMS1117-3.3

Cypress FX2 pinout:

PD5	1-	O	-56	PD4
PD6	2-		-55	PD3
PD7	3-		-54	PD2
GND	4-		-53	PD1
CLKOUT	5-		-52	PD0
VCC	6-		-51	*WAKEUP
GND	7-		-50	VCC
RDY0/*SLRD	8-		-49	RESET#
RDY1/*SLWR	9-		-48	GND
AVCC	10-		-47	PA7
(24MHz crystal) XTALOUT	11-		-46	PA6
(24MHz crystal) XTALIN	12-		-45	PA5
AGND	13-		-44	PA4
AVCC	14-		-43	PA3
(USB D+) DPLUS	15-		-42	PA2
(USB D-) DMINUS	16-		-41	PA1
AGND	17-		-40	PA0
VCC	18-		-39	VCC
GND	19-		-38	CTL2
(CTL0, AD9288 ENCA/B) *IFCLK	20-		-37	CTL1
RESERVED	21-		-36	CTL0 (IFCLK, AD9288 ENCA/B)
(EEPROM SCL) SCL	22-		-35	GND
(EEPROM SDA) SDA	23-		-34	VCC
VCC	24-		-33	GND
PB0	25-		-32	PB7
PB1	26-		-31	PB6
PB2	27-		-30	PB5
PB3	28-		-29	PB4

NXP 74HC4051D (upper/lower, CH1/CH2) pinout:

Y4 1-   O -16 VCC Y6 2- -15 Y2 Z 3- -14 Y1 Y7 4- -13 Y0 Y5 5- -12 Y3 (GND) E# 6- -11 S0 VEE 7- -10 S1 GND 8- -9 S2 (GND)

Y4 1-   O -16 VCC Y6 2- -15 Y2 Z 3- -14 Y1 Y7 4- -13 Y0 Y5 5- -12 Y3 (GND) E# 6- -11 S0 VEE 7- -10 S1 GND 8- -9 S2 (GND)

Microchip 24LC64I pinout:

(VCC) A0	1-	O	-8	VCC
(GND) A1	2-		-7	WP (GND)
(GND) A2	3-		-6	SCL (FX2 SCL)
VSS	4-		-5	SDA (FX2 SDA)

Analog Devices ADS9288 pinout:

AD9288 pins	Description
S1, S2	S1=VCC, S2=GND. "Normal operation, data align disabled".
DFS	Tied to GND. Data format select = "offset binary" (not "twos complement").
AINA, AINB	Analog input channels.
D0A-D7A	Connected to FX2 PB0-PB7.
D0B-D7B	Connected to FX2 PD0-PD7.

Firmware

Note: The firmware is flashed into the device permanently.

EEPROM layout

The device has a 8KB I²C EEPROM with the following layout:

c2 47 05 31 21 00 00 04 XX XX XX XX XX XX .. ..

Description:

Bytes	Description
0	0xc2: FX2 "c2 load" mode, i.e. VID/PID/DID are loaded from EEPROM as the firmware.
1-2	0x0547: USB vendor ID (VID before firmware renumerate).
3-4	0x2131: USB product ID (PID before firmware renumerate).
5-6	0x0000: USB device ID (DID before firmware renumerate).
7	0x04: FX2 configuration byte (see FX2 TRM for details).
8-1917h	Firmware.
1918h -1fffh	All-0xff.

See full dump of FX2 boot communication with EEPROM: Media:YiXingDianZi MDSO eeprom read.sr.gz

Resources

• Aliexpress page