Topic: ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH - page 134. (Read 528055 times)

I haven't been on this forum long, my interest in mining is what brought me here. The amount of knowledge present in this forum leads me to believe that a kick-starter or grassroots movement to build mining equipment as an alternative to the Chinese companies is not far-fetched. I will start a separate thread and see what others have to say. Pessimists need not apply and may remain here to bitch about Bitmain, ROI, etc.

If they were termination resistors they would be pull ups to 3.3V and that is a likely outcome, but still worth someone checking if there is any connection from these or any other PIC lines to either the I2C bus or the Controller connector?

Rich

^my guess is those resistors terminate to ground, but not 100% sure of that

I have traced what I can from the pictures and everything makes sense around the PIC & the Digital Pot as regards the PIC being factory programmed from the row of contacts on the board edge.

What would be worth investigating is where if anywhere the I2C data & Clock connections go to on the rest of the board,?



The red traces show the Data & Clock connections from the PIC to the Digital Pot, however there is also through R21 & R22 additional connections that connect to the inner layer on the PCB, or are these just termination resistors. Question is do they pick up the main I2C bus used by the LM75 Temperature IC or go to separate connections on the Controller connector?

Rich

I thought that Romania is now in the European Union, but you still live in  Nicolae Ceaușescu  time.

You need a tax specialist. In EU there are no such restrictions, someone is lying to you.

I've bought past 4 months 44 Antminer (3x S5+ and 41x S7) from Bitmain and paid VAT over 13000 euro . There are no limits if they are for personal use only.

My s7 was held by customs because i have imported 4 of them and max is 3 per person they will not release them all i can do is ship them back.do you think bitmain will ever refund me or what will happen? They could also re ship them but with 2 per package not all 4 of them

Dear BITMAIN,
                   I have question on live sale means if some one have purchase from outside China its headquarter. Is it fully trusted and liable to purchase ANTMINER S7 from the BITMAIN site. Its nowdays hacker attacking age. How C'd be save mode of purchasing. Kindly share the latest pricing of the above mentioned miner machine. Thanks

I think it highly improbable that the PIC is operating a second layer of closed loop, safety based voltage control. The sort of information it would need to detect and react correctly to the fault situations you describe is just not available, and far from certain that attempting to compensate for them would be advisable. I could of course be, and often am wrong, but always happy to stick my neck out with an opinion.  

The only parameter that it would make sense for the PIC to react to and adjust voltage for is Frequency, and unless that info was sent to the PIC by the Controller it is not available.

I think the PIC & Digital Pot are at the moment in place to allow a Factory adjustment to the Core Voltage to be made either to cope with batch variations in the BM1385 and / or to optimise each hash board for it's default frequency?

What does not quite make sense if this was the only objective is why they did not just use an EE as opposed to a RAM based Digital Pot and not bother with the PIC?

My best answer to this is that there is connection from the Controller to the PIC to allow at some future date a version of firmware to be released that allows setting of the Core voltage or even an automatic selection of core voltage with a frequency change?

When someone gets a chance tracing the connections to the PIC will reveal what is or could be possible?

Rich

I agree that the most recent Nicehash spike was due to the insane difficulty increase. It probably takes a few hours for the outstanding orders to catch up with an 18% blow (like the last one).

I still have nicehash set as my first mining pool, but with a very large profitability setting as the password option. This way if there's ever a high value alt coin again that's worth taking advantage of (can you say "paycoin") my miners will switch. Otherwise I don't want them to switch for a short term artificial gap created by a large difficulty increase.

Otherwise my main pool is Kano. I'm done with high latency pools, incompetent pool managers, and pools that frequently mine worthless zero transaction blocks.

Does anyone have a S7 coupon for sale??

It can have it, but it does not do anything. A design that allow software control of volt would be great, but this is just like the S3. Unlike the S4 which the software disabled the software control for unknown reason, which you were able to re enable with custom firmware.

That UI setting just set the value in the config file, you can instead simply write the value directly in the config file, but its not going to do anything either.

First of all congratulations J4bberwock for the found that messy MCP4017T-503E and 12F1572.
i can explain that setup with simple way :
this specific pic has 10bit ADC and 5bit DAC. so, it reads a voltage and calculate a proper value of resistor then compare a setted one then send a Power good signal to Controller and also communicate with Digital pot for adjusting. if setted value can be handle with Dpot sobiet, if not pic immidiately handle the control for voltage raise/fall safety. Finally this is closed loop voltage controller circuit for safety not for adjusting.

Now, you will ask that to me or yourself, why they make another closed loop cycle like that (1.lm27402 has that). i think when some bm1385 chips fall(O to X) then inner voltage will raise, also think opposite, if some chips are greedy they decrease a inner voltage. This point is says to us, bm1385 is not working stable with alone.

Guys how long does it take Bitmain to answer ticket? My s7 arrive tommorow and i still dont have new invoice that i asked and also no CE Certificate document. Anyone has this CE certificate fot S7? I was searching google but i only found for s5.

I guess I saw it before upgrade to December's FW...

No, I haven't seen one.  Hence, the J4bberwock IBM 2000 BB x 2 with B/O Board and voltage regulator setup was engineered and designed to assist with that issue.

Does S7 have a voltage setting in the ui?

I considered this method:
change the cgminer.conf.factory to 0706 and then do a factory reset - perhaps it will force the voltage change?

It will depend on there being a connection from the PIC to the Controller as well as the code. Could just be that each board has an individual value set as part of the final testing, but you are right if that was the case they could just have used an EE based Pot and no PIC  

They don't seem to do anything, but why put a digital pot adjustable over I2C with a PIC just to control it if you just set a fixed value?
Some people with better Antminer firmware knowledge may be able to unlock it if it's locked somehow.

It would be great if they do something.... but my gut feeling is that those numbers look very familiar from all sorts of conf files in other miners that do nothing?

That said with the microcontroller & the Digital pot all the hardware we need is there and someone told be that the S4 used a PIC to control the VRM in that, so fingers crossed...