Antminer S9 - BM1387 Chip Deep Dive; BM1387 Circuit Diagram and Analysis; BM1387 Chip Pinout and Functions

Principle analysis of single chip in voltage domain （ Figure 5 Figure 6 below ）：
5 、 BM1387 Circuit diagram
6 、 BM1387 Chip Pin
Signal Description
Name
I/O
Active
Level
Description
1
NRSTO
O
L
Output to the chip of next level, for the loop
2
BO
O
H
Respond Busy Output
3
RI_A
I
N/A
Auxiliary Respond Input add diode and pulldown
4
Re
I
N/A
Respond Input. Schmitt input and internal pullup
4