a213m

mingu2001
P.S. It would be great if a self-check sort of a function was implemented, so we could more easily diagnose a problem on the board.
Also, it would be helpful if I could know which test the program failed to validate, just for debug reasons.

Great suggestion!
 
I added a self test function, which will test the device's basic i2c bus and pin control functionality and report any issues.
The test can be invoked from within Arduino IDE Serial Monitor by sending a "?" command.
 

 

 

 

Thanks!
I've tested the nano that didn't work before with the new firmware's self test function. (Obviously, I removed the I2C Test since I have the DRAM connected to the my pro micro.)
 
Now I know either
1. I've borked the optocouplers somehow (probably fed 9v at some point by accident then..? idk :P)
or 2. The analog pins on the nano are dead. Like, dead dead. RIP..
 
Well, I'm still very satisfied with the project. I've gotten my ram to have XMP of 3200 CL16 to 3733 CL16.
Even with better timings than the 3200 default one, and even on Hynix CJR die. (Lucky for Hynix die I guess..?)
 
Anyways, thanks for the support, and implementation of my suggestion!

New version with a couple of fixes: 20210817

• Fixed RSWP dialog window reapplying last RSWP settings when closing window
• Fixed crash when manually overriding RAM type with unsupported RAM type

SA0 control isn't required for RSWP.
 
What exactly doesn't work? Enter "9 1" (no quotes) in Arduino serial monitor and check if you have 9V present on SA0 pin on DIMM/EEPROM.

Does reading work? How did you connect RAM to Arduino? Via a DIMM adapter, DIMM slot, or soldered directly to a motherboard?
 
After you click "Clear RSWP", what message is displayed?
 
A photo of your device would help diagnose further.

New version with a minor fix: 20211010

• Fixed hanging that occurred if the device was disconnected during long EEPROM operations (read/write/verify)

(Only the DLL is updated, the EXE is unchanged, thus you'll see a mix of old and new files).

New version with important fixes and minor UI fix: 20211105
 

GUI

• Fixed log tab title not clearing counter when disabling log entries counter
• Fixed partial page writes to pre-DDR4 EEPROMs
• Fixed incorrect PSWP identification

Firmware

• Fixed device name assignment

New version: 20211119
 

GUI

• Fixed some option items not highlighting in settings window after being edited
• Fixed some groupboxes not resizing when settings window is resized
• Fixed incorrect I2C clock reporting upon initial connection
• Added part number identification for all RAM types
• Integrated firmware (Help > Firmware update...)

Firmware

• Added factory reset settings command

Hi,
 
1. The program/device interface with SPD EEPROMs via SDA, SCL, SA#, VDDSPD, and VSA lines which are present on all DIMM modules, so all kinds of DIMMs up to DDR4 are currently supported. Full size DIMMs and SODIMMs use the same EEPROM chips, so there's no difference for the program what module types they are used on. An adapter is needed, as DIMM and SODIMM pinouts differ.
 
(You link wasn't posted, but if you meant to buy something like this, then yes, this will work: https://m.media-amazon.com/images/I/613ts61Ts9L._AC_SL1000_.jpg)
 
2. If the DDR4 EEPROM isn't write protected, then yes, it can be written to, but if it is, the protection can be removed with the program to enable writing. DDR4 not supporting permanent write protection is per Jedec's specification. EEPROMs used on DDR3 and prior could be reversibly or permanently write protected via a software command, but starting from DDR4 software permanent write protection was removed, so DDR4 of any type only supports reversible write protection.

New version: 20211201
 

GUI

• Fixed CRC status appearing when SPD data is not loaded
• Improved performance

Firmware

• Fixed restore defaults command not resetting I2C clock settings
• Fixed DDR4 detection compatibility
• Improved RSWP reliability

 
Just like the last time, firmware files are integrated into the main program, click "Help > Firmware upgrade..." to extract them.
Also the binaries are compiled for .NET 4.0, so separate XP version is not included as the program will work in all version of Windows.

Minor update: 20211202
 

GUI

• Includes updated firmware (see below)

Firmware

• Updated Read RSWP in compliance with Jedec EE1002(A) and TSE2002av definitions

 
This update is for DDR3 and older RAM, which requires VHV on SA0 to read RSWP status.
Other than that, there are no changes.
 
Edit: download again, I forgot to update version string in settings, everything is fine now.

Don't worry about SA2, since its configuration isn't required for any operations. SODIMM modules already have SA2 pin wired to ground on the PCB since they are meant to be used in systems where no more than 4 modules may be present.
 
 

Hi a213m, amazing project, thank you!
 
While waiting DDR4 SO-DIMM adapter, I tried reading/writing DDR3 modules.
But in event log I found error:

COM10: DDR3-SDRAM RSWP disabledl; SA1 control unavaliable

When I connected to device with terminal and tried to change SA1 manually, SA1 works well. It is serial data dump (hex bytes):
21 73 01 70 01 01 01 73 04 70 01 00 01 73 01
Red bytes received from device, green - written to device. Voltage on SA1 pin changes accordingly.
What could be the problem?
 

21 66 10 65 10
Arduino Nano (Mega328p)
 

21 70 01 00 73 70 01 01 73 70 01 00 73 70 01 01 73 70 01 00 73 01 01 01 04 01 04 01 04 01 04
then again 73 01
seems to be, falling SA1 is too slow. so I added 10K resistor from SA1 to GND, now device works well.
 
tested adding delay to setConfigPin function, also works without additional resistor.

New version: 20211206

GUI

• Check RSWP and Set RSWP windows properly centered for all supported RAM types
• Check RSWP and Set RSWP windows standardized for all supported RAM types
• Improved automatic EEPROM SPD size detection
• Added dialog box result after PSWP operation
• Removed redundant "Set RAM type" option

Firmware

• Enforced hardware support
• Improved RSWP support
• Improved PSWP support
• Improved pin controls