Watchdog Extension

MOPS/586

Hardware Description

With the aid of a special Interrupt 15h function, the watchdog on a JUMPtec board can be controlled very easily.

The respective functions have the following calling conventions:

Watchdog init	Int 15h	00h
Input:	AH	= E0h
	AL	= 00h
	BX	= timeout in 0.2sec increments
	CX	= delay in 0.2sec increments
Output:	DX	= watchdog action (0 = reset, 1 = NMI)
Output:	None
Description:	This funcion is a public JUMPtec INT15h extension used to init the
	watchdog on JUMPtec boards.

Watchdog trigger	Int 15h	01h
Input:	AH	= E0h
Output:	AL	= 01h
Output:	None
Description:	This funcion is a public JUMPtec INT15h extension used to trigger the
	watchdog on JUMPtec boards.

Detailed description of the watchdog function:

Programming:

The function Init watchdog must be called only once. The three parameters delay time, timeout time an trigger event must be set. After initialisation the watchdog will be active only after the delay time has expired. The watchdog must be reset during the timeout time with the trigger watchdog function. Otherwise a RESET or NMI will occur depending on trigger event.

The trigger- and the delay time can be set in steps of 0.2 sec.

The maximum values are:

Ÿtimeout time	65535*0.2sec. = 13107s ≅ 3h 38min
Ÿdelay time	32767*0.2sec. = 6553s ≅ 1h 49min

The system BIOS makes it very easy to use the watchdog via software interrupt 15h. Two ways are possible to access the watchdog: The simplest way is to use AH=0E0h to init or trigger the watchdog. The second way is to use the functions ”Write I2C”and ”Read I2C”with AH=0E1h and handling the I2C bus protocol.

A) Simple with AH = E0h

Init Watchdog (Int 15h, AH=E0h)

Called with	AX	E000h
	BX	timeout time
	CX	BX = 0 ð watchdog off. BXmax = 0FFFFh
	CX	delay time
	DX	CX = 0 ð no delay. CXmax = 07FFFh
	DX	trigger event
		DX = 0 ð RESET, DX = 1 ð IOCHCHK

Tri-M Systems Inc., 6-1301 Ketch Court, Coquitlam, B.C., V3K 6X7, Canada Phone: (604) 527-1100, (800) 665-5600 Fax: (604) 527-1110

Email: info@Tri-M.com Web: www.Tri-M.com

MOPS/586 specifications

Tri-M Systems MOPS/586 is an advanced multi-application operating system specifically designed to meet the demands of modern computing environments. This system offers a range of unique features, technologies, and characteristics that position it as a leader in its class, particularly for embedded and real-time applications.

One of the standout features of the MOPS/586 is its modular architecture. This design allows for easy integration of various components, enabling users to tailor the operating system to fit their specific needs. Developers can add or remove modules seamlessly, ensuring that the system remains lightweight and efficient while retaining the necessary functionalities.

MOPS/586 utilizes a microkernel design, which enhances system stability and performance. By focusing on minimalism, the microkernel handles only the most essential services, such as communication and process management, while additional services can run in user space. This separation reduces the risk of system crashes and allows for easier maintenance and upgrades.

Another key characteristic of MOPS/586 is its real-time capabilities. The operating system supports deterministic processing, ensuring that critical tasks are executed within strict time constraints. This feature is particularly beneficial for industries such as automotive, aerospace, and telecommunications, where timing and reliability are crucial.

In terms of hardware compatibility, the MOPS/586 is designed to work seamlessly with a wide array of devices and platforms. Its support for x86 architecture, along with various peripheral interfaces, enables it to be deployed on both legacy systems and cutting-edge hardware. This versatility is a significant advantage for organizations looking to leverage existing infrastructure while transitioning to newer technologies.

Security is a paramount concern in today's digital landscape, and MOPS/586 addresses this through its robust security framework. The system incorporates user authentication, access control, and secure communication protocols, ensuring that sensitive data remains protected. Additionally, the operating system is regularly updated to address vulnerabilities and threats, keeping users safe in an ever-evolving cybersecurity environment.

Overall, Tri-M Systems MOPS/586 stands out for its modularity, microkernel architecture, real-time support, hardware versatility, and robust security features. These elements combined make it an ideal choice for businesses and developers looking for a reliable, adaptable, and secure operating system for their critical applications. Whether in embedded systems or more extensive computing environments, MOPS/586 delivers the performance and reliability that organizations need to succeed in today’s technology-driven world.

MOPS/586