Sir, what is SPI_CLK? And What is the purpose of this signal?
What is SPI_CLK?
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Re: What is SPI_CLK?
on what?Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....
"Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me
Excuse me while i do something dangerous
You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.
Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore
Follow the white rabbit. -
Re: What is SPI_CLK?
http://en.wikipedia.org/wiki/Serial_..._Interface_Bus
Without clock signal there will be no data transfer between master and slave.
(EC can't read bios from SPI flash).Comment
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Re: What is SPI_CLK?
What bios, EC or main? If main, maybe it will not need to be powered before power button pressed. If EC bios, then need to find why 3V ALW not present on EC.
SPI_CLK will be present only when data is moving, if EC will be read once, then after reading there does not have to be signal on SPI_CLK before power is cycled again.Comment
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Re: What is SPI_CLK?
What bios, EC or main? If main, maybe it will not need to be powered before power button pressed. If EC bios, then need to find why 3V ALW not present on EC.
SPI_CLK will be present only when data is moving, if EC will be read once, then after reading there does not have to be signal on SPI_CLK before power is cycled again.Comment
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Re: What is SPI_CLK?
SPI is a 3 wire communication protocol, similar to i2c. There's a clock wire and a couple of data wires (one for input, one for output)
Basically, each time signal goes high/low (change in the state) on the clk wire, the chip makes something available on the data wire or reads what's present on the wire (one bit).
These chips can work at up to 75-100 Mhz (if you have a cheap scope you may not even detect signal on that clk pin) so it's possible the bios chip is read into memory in a second or so at boot and from that point you won't notice any signals on those pins.
Here's a datasheet for some random flash spi based chip (16 mbps, very common) :Comment
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