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CSA-5200

BYPASS_BTN#

WDOG_REEST

LAN_BYPASS_LED#

Watchdog

(ITE IT8786)

LPC

BYPASS_LAN#

Active Low

Network

Controller

LAN IN

LAN OUT

PCH

Haswell CPU

CSA-5200

(Implemented by

HW)

BYPASS_BTN#

LAN[1,2,3,4]

RESET

WDOG_CTRL

Logical Blocks in the Watchdog Implementation

The watchdog is controlled by writing to the SuperIO registers. The BYPASS_LAN# signal

will indicate whether LAN bypass is activated. When the BYPASS_LAN# output is 0 (active-

low), the CSA-5200 hardware will bypass the LAN inputs (LAN1, LAN2, LAN3, LAN4). When

the BYPASS_LAN# output is 1 (inactive), the CSA-5200 hardware will take in the LAN inputs

for IP package inspection and security processing. The various pin functions are described

as follows.

• BYPASS_BTN#: issue a low pulse after the button is pushed. The BIOS routine will

read the bypass button status, then trigger BYPASS_LAN# when the button is

pushed. Linux watchdog software need NOT handle the BYPASS_BTN#.

• BYPASS_LAN#: active low. Both BIOS and Linux watchdog software can read and

change this GPIO status. LAN bypass is activated when BYPASS_LAN# is set to 0

(active-low).

• WDOG_CTRL: LPC bus. Both BIOS and Linux can control the SuperIO watchdog by

writing its registers over LPC bus.

• WDOG_RESET: issue low pulse when feeding fails. A system reset will be

triggerered if WDT_ENABLE is set to 1. After a system reset, BYPASS_LAN# is set

to 0 (active-low) automatically by the BIOS.

• LAN_BY_LED#, lit when BYPASS_LAN# is set to low. The feature is implemented by

pure hardware logic and there is no control required by BIOS/Linux software.

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Adlink CSA-5200 Manuel d'utilisateur Page 33