ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH

[RichBC]

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.

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

[1714871784]

1714871784

[1714871784]

1714871784

[addideline]

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

[vortexz]

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

[Tupsu]

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

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.

[RichBC]

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?

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

[klondike_bar]

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

[RichBC]

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

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

[elokk]

Heating a home with natural gas will cost less then the electricity running miners. Gas is pretty cheap. I have natural gas, so I have no idea on what electric or oil would be. In 2.5 months it will be March, winter over in the Northeast US. If everyone spent all the money they spent on buying miners from Bitmain/China and upgrading electricity in the home (S7 time frames) they would of made a profit already. Two months ago BTC was -200. When did everyone start dumping money on the S7's? For BTC to survive we need to stop feeding China. I really laugh when I see users promoting certain non-china pools and then I see them on here buying S7's like donuts. Buying Chinese made mining hardware isn't  the same as mining on one, but it does just feed the China machine that much more - in the grand scheme of things. The Bitcoin "industry" has already indicated this is a problem. Change has to start somewhere.

please point me to a new miner I can buy that is under 2k and not sold by china.

I know we have some REALLY SMART people on this forum that know circuit boards and processors.  Speaking to the REALLY SMART people: Can you make a bitcoin miner?  Cost?  Time?  How can I help?

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.

[RichBC]

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.

Please don't start a new thread, have a read of this one and add your thoughts to it....

What does it take to start manufacturing miners?

[vortexz]

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

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.

I finally managed to get them out of customs, after long long struggles !!


Every country has it's own rules regarding imports, I belive Romania has some weird rules where you can't import big expensive products on personal name, only on company is allowed

[Cyper_BLC]

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?

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

these resistors as you shown are i2c standart 4.7k serial data-clock pullup resistors on 3.3 Vcc line.

[RichBC]

these resistors as you shown are i2c standart 4.7k serial data-clock pullup resistors on 3.3 Vcc line.

So you have checked that the PIC is completely stand alone from the rest of the board with no connections  to the LM75 I2C or the Controller connector?


Rich

[fr4nkthetank]

I switched to Kano pool, looks good, I like that stats update really fast, and you have lots of them.  UNFORTUNATELY, I had to change settings in the antminer batch 8, big mistake, as it took many "soft reboots" and 2 actual "reboots" to get it at 4720ghs, with good hw.  I also see lots of X's for the chips, but thats just a bad reading or something because the hashrate is good and it goes away after 5 minutes.  

Note to self:  dont ever change anything in the settings ever again.  ever.

[Cyper_BLC]

these resistors as you shown are i2c standart 4.7k serial data-clock pullup resistors on 3.3 Vcc line.

So you have checked that the PIC is completely stand alone from the rest of the board with no connections  to the LM75 I2C or the Controller connector?


Rich

no i dont, i said digital pot connected to pic via i2c bus with normal pullup resistors, if Dpot connects to lm75 i2c line, it must have a adress like:
                    Ta0 Ta1 Ta2
hashboard A-  0     1     0
hashboard B-  1     1     0
hashboard C-  0     0     1

but it hasnt got an id pins.
i said before this is closed loop safety circuit.

[RichBC]

these resistors as you shown are i2c standart 4.7k serial data-clock pullup resistors on 3.3 Vcc line.

So you have checked that the PIC is completely stand alone from the rest of the board with no connections  to the LM75 I2C or the Controller connector?


Rich

no i dont, i said digital pot connected to pic via i2c bus with normal pullup resistors, if Dpot connects to lm75 i2c line, it must have a adress like:
                    Ta0 Ta1 Ta2
hashboard A-  0     1     0
hashboard B-  1     1     0
hashboard C-  0     0     1

but it hasnt got an id pins.
i said before this is closed loop safety circuit.

So can you just confirm that everything you are saying is just guesswork as opposed to checks and measurements you have made on a hash Board?

I have given my comment above on the "safety circuit".

[Cyper_BLC]

these resistors as you shown are i2c standart 4.7k serial data-clock pullup resistors on 3.3 Vcc line.

So you have checked that the PIC is completely stand alone from the rest of the board with no connections  to the LM75 I2C or the Controller connector?


Rich

no i dont, i said digital pot connected to pic via i2c bus with normal pullup resistors, if Dpot connects to lm75 i2c line, it must have a adress like:
                    Ta0 Ta1 Ta2
hashboard A-  0     1     0
hashboard B-  1     1     0
hashboard C-  0     0     1

but it hasnt got an id pins.
i said before this is closed loop safety circuit.

So can you just confirm that everything you are saying is just guesswork as opposed to checks and measurements you have made on a hash Board?

I have given my comment above on the "safety circuit".

i dont touch that board, i dont see in my hands, i dont measure that, my posts for this subject are only guesswork ofcourse.
but engineer guesswork. if i made this board i use max813 not this one. this is bullshit compansate safety circuit.

Edit:
also dont forget the S7's boot-idle-working voltages are different. this closed loop circuit work for these too.

[vortexz]

My S7 are getting lots of HW errors and are underperforming
I have 4 of them ,only 1 is getting low HW errors and good performance

The rest of them perform like this one : https://gyazo.com/af319f55fa78b0ed11626611e76888b0
with HW errors around 0.03 % or higher

How can I fix this ?

[Cyper_BLC]

My S7 are getting lots of HW errors and are underperforming
I have 4 of them ,only 1 is getting low HW errors and good performance

The rest of them perform like this one : https://gyazo.com/af319f55fa78b0ed11626611e76888b0
with HW errors around 0.03 % or higher

How can I fix this ?

change the power supply
or decrease the freq.

[Biodom]

My S7 are getting lots of HW errors and are underperforming
I have 4 of them ,only 1 is getting low HW errors and good performance

The rest of them perform like this one : https://gyazo.com/af319f55fa78b0ed11626611e76888b0
with HW errors around 0.03 % or higher

How can I fix this ?

3min is way too short a time to make conclusions. what batch is this?
see the dynamics for longer (at least 1hr). Sometimes they start slow, then improve.

[vortexz]

I have batch 8, running at stock 700 Mhz