The BM1366

The BM1366 is an undocumented SHA256 mining ASIC from Bitmain. It’s mostly used in the Antminer S19.

Price	New: ~$25 Used: ~$15 in small quantities
Efficiency	25J/TH
Serial Protocol	UART
Baudrate	-
Footprint	-

Pinout

Pinout	Explanation
VDD1_0	Internal voltage domain 1. (for bypass capacitors)
VDD2_0	Internal voltage domain 2. (for bypass capacitors)
VDD3_0	Internal voltage domain 3. (for bypass capacitors)
VSS	Ground
NRSTI	Reset input
BI	Busy Input
RO	Serial Response Output
CLKI	Clock Input
CI	Serial Command Input
ADDR0	Address 0 (unknown functionality)
ADDR1	Address 1 (unknown functionality)
PLL_VSS	Phase Locked Loop Ground
VDDIO_08_0	0.8V IO voltage
VDDIO_18_0	1.8V IO voltage (this is normally 1.2V now)
VDD1_1	Internal voltage domain 1. (for bypass capacitors)
VDD2_1	Internal voltage domain 2. (for bypass capacitors)
VDD3_1	Internal voltage domain 3. (for bypass capacitors)
VSS	Ground
NRST0	Reset Output
BO	Busy Output
RI	Serial Response Input
CLK0	Clock output
CO	Serial Command Output
INV_CLK0	Inverted Clock Output (unknown use)
PIN_MODE	Pin mode selector
VSS	Ground
VDI0_08_1	0.8V IO voltage
VSI0_08_1	1.8V IO voltage (this is normally 1.2V now)

Versions

How to identify a cracked “destroyed” chip

Here you can cleary see a crack right in the middle of the die. This indicates too much heat on the chip itself probably during a soldering attempt. This crack identifies that this chip will no longer work and therefore has been destroyed. It has multiple versions.