VXI SM8000 Interrupt Status Register Read Only, Interrupt Control Register Read and Write

VXI Technology, Inc.

Interrupt Status Register – Read Only

ADDR	Plug-In LA+0x1A
D15	Scan Function	The latest scan list update is complete.
	done
D14	Openbus Active	The Openbus was activated by one or more programmed inputs.
	Event true	See description of the Openbus in the module register section.
		D13 = Module 5, … and D8 = Module 0.
D13-D8	Modules 0-5 Busy	The programmed Busy signal from one of the modules has timed
	complete
		out. This indicates that the relays actuated for that BUSY cycle
		have settled and a measurement may take place.
D7-D0	Reserved	Always reads back as FFFF16

Note: This status register may be used in a polled fashion rather than allowing the events above to generate an Interrupt. A read of this register will clear any active bits. Bits that are not set, or are about to be set, are not affected by a read of this register.

Interrupt Control Register – Read and Write

ADDR	Plug-In LA+0x1C
D15	Scan Function	0	= enabled
	done mask bit	1	= disabled
D14	Openbus Active	0	= enabled
	Event true mask bit	1	= disabled
	Module 0-5 Busy	0	= enabled
D13-D8		1	= disabled
	complete
		D13 = Module 5 … and D8 = Module 0.
D7	IR ENA*	0	= writing a 0 to this bit enables interrupter capabilities
		1	= writing a 1 to this bit disables interrupter capabilities
D6	IH ENA*	The module has no interrupt handler capability, therefore writing a
		1 or 0 has no effect. A 1 is always read back for this bit.
	Interrupter IRQ	The complement of the value programmed into these three bits
D5-D3		reflects the selected IRQ line used by the module. A value of 0112
	Line	would select IRQ4, a value of 0002 would select IRQ7, and a
		value of 1112 would disconnect the IRQ lines.
		The module has no interrupt handler capability; therefore writing
D2-D0	Handler IRQ Line	to these bits has no effect. A 1112 is always read back for these
		bits.
Note: That all bits in this register are set to 1s upon receipt of a hard or soft reset.

	Subclass Register – Read Only
ADDR	Plug-In LA+0x1E
D15	VXIbus Extended	Always reads as 1.
	Device
D14-D0	Extended Memory	Always reads as 7FFD16
	Device

SM8000 Series Programming 41