User Guide

Chapter 3
SR7-8X
3-10
For the FPIO4 pin’s count-name list, please refer to table 3-2.
Table 3-2. FPIO4 pin count name list
PIN Name Significance of signal PIN Name Significance of signal
PIN 1 HDD LED (+) PIN 2 SP-LED (+)
PIN 3 HDD LED (-) PIN 4 SP-LED (-)
PIN 5 Reset SW (-) PIN 6 PWR-ON (+)
PIN 7 Reset SW (+) PIN 8 PWR-ON (-)
PIN 9 No Connection PIN 10
No Pin
PIN 11 No Pin PIN 12 No Pin
PIN 13 No Pin PIN 14 No Pin
PIN 15 Speaker (+5V) PIN 16 PWR LED (+)
PIN 17 Speaker (GND) PIN 18 No Pin
PIN 19 Speaker (GND) PIN 20 PWR LED (-)
PIN 21 Speaker (Driver) PIN 22 No Connection
FPIO4
PIN 23 No Pin
FPIO4
PIN 24 No Connection
(6). SMB: System Management Bus (SM-Bus) Header
This header is reserved for the system management
bus (SM-Bus). The SM-Bus is a specific
implementation of an I
2
C bus. I
2
C is a multi-master
bus, this means that multiple chips can be connected
to the same bus and each one can act as a master by
initiating a data transfer. If more than one master
simultaneously tries to control the bus, an arbitration
procedure decides which master gets priority. You
can connect the devices which utilizes the SM-Bus.
Note: Watch the pin position and the orientation