Supermicro SuperServer SYS-221BT-DNTR - Page 75

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Chapter 4: Motherboard Connections
Watch Dog
JWD1 controls the Watch Dog function. Watch Dog is a monitor that can reboot the system
when a software application hangs. Jumping pins 1-2 will cause Watch Dog to reset the
system if an application hangs. Jumping pins 2-3 will generate a non-maskable interrupt
signal for the application that hangs. Watch Dog must also be enabled in BIOS. The default
setting is Reset.
Note: When Watch Dog is enabled, the user needs to write their own application software
to disable it.
Watch Dog
Jumper Settings
Jumper Setting Denition
Pins 1-2 Reset (Default)
Pins 2-3 NMI
Open Disabled
BMC and PCH I²C/SDA to VRM and BMC and PCH I²C/SCl to VRM Select Jumper
Use jumper JVRM1 to select between BMC and PCH I²C/SDA for VRM support or BMC and
PCH I²C/SCl for VRM support. Connect a cable to JVRM1 to enable BMC and PCH I²C/SDA
for VRM support. See the table below for jumper settings.
BMC and PCH I²C/SDA to VRM and BMC and PCH I²C/SCL to VRM Select Jumper
Jumper Settings
Jumper Setting Denition
Closed BMC and PCH I²C/SDA for VRM support (Default)
Open BMC and PCH I²C/SCl for VRM support
CPLD JTAG Enable Jumper
Use jumper JPFR1 to enable CPLD (Complex Programmable Logic Device) JTAG support.
Connect a cable to JPFR1 to support CPLD JTAG. See the table below for jumper settings.
CPLD JTAG Enable Jumper
Jumper Settings
Jumper Setting Denition
Closed CPLD JTAG Enabled (Default)
Open CPLD JTAG Disabled