Advantech PCA-6187 user manual System Memory, 5 Watchdog timer output J2, watchdog timer is reset

Table 1.5: Watchdog timer output (J2)

Function	Jumper Setting
IRQ11	1
	1-2 closed
* Reset	1
	2-3 closed
* default setting
Note:	The interrupt output of the watchdog timer is a
	low level signal. It will be held low until the
	watchdog timer is reset.

1.9 System Memory

The PCA-6187 has four sockets for 184-pin dual inline memory modules (DIMMs) in two separated memory channels. It can operate with single channel or dual channel modules. We recommend to use dual channel mode to provide optimized performance.

All these sockets use 2.5 V unbuffered double data rate synchronous DRAMs (DDR SDRAM). They are available in capacities of 128, 256, 512 and 1024 MB. The sockets can be filled in any combination with DIMMs of any size, giving a total memory size between 128 MB and 4 GB.

Note: System resources such as PCI and AGP require physical memory address locations that reduce available memory addresses above 3GB. This may result in less than 4GB of mem- ory being available to the operating system and applications.

13