RadiSys EPC-2 Hardware Reference Manual
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IRQ15 unassignedThe assignment of .i.DMA channels; is shown in the following table.0 unassigned1 .i.GPIB controller;2 .i.floppy disk controller;3 .i.SCSI controller;5 unassigned6 unassigned7 unassignedWatchdog TimerEPC-2 contains a continually running timer having a period of either about 0.2or 6.7 seconds (software selectable). The .i.watchdog timer; event is generatedwhenever the period expires. This event may be enabled as a source of the IRQ10interrupt, or as a hardware .i.reset;. The timer is reset to its maximum valueby an I/O read of the .i.module status/control register;.EXMbusThis section applies to only the EPC-2x.A subset of the .i.EXMbus;, an I/O expansion bus, is provided at the rear of afront-panel slot in the EPC-2x. .i.EXMID signal;The EXMbus is very similar tothe .i.PC/AT I/O bus;. In addition, it contains a signal -EXMID used fordynamic recognition and configuration of EXMs. EXMs respond to one or more I/Oaddresses in the range 100h - 107h only when their Ä.i.EXMID signal; is as-serted. EXMs are required to return a unique EXM-type identification byte inresponse to a read from I/O address 100h. The .i.EXMID driver register;provides the means to assert the ÄEXMID signal.In the EPC-2x, only 8-bit transfers are supported across the EXMbus and onlyinterrupt IRQ3 is available.Further information on the EXMbus, its connectors, and standards for buildingEXMs is available upon request.VXIbus Interface.i.VMEbus interface;.i.P1 connector;.i.J1 connector;.i.P2 connector;.i.J2connector;The EPC-2 module connects to the VXIbus J1 and J2 connectors in theleft of the two slots occupied by the EPC-2.On the P1 connector, the EPC-2 uses all of the defined VME/VXI lines exceptSERCLKSERDAT+5V STDBYOn the P2 connector, the EPC-2 uses all of the defined VXIbus lines exceptSUMBUSLBUSC00-LBUSC11RSV1,RSV2,RSV3+24V,-24VSlot 0 and System Controller FunctionsWhen the EPC-2 is configured as the .i.slot 0 controller;, it performs the VXIslot-0 functions and the VME .i.system controller; functions.The slot-0 functions consist of generation of the CLK10 signals and MODIDsupport.The VME system controller functions consist of serving as the .i.bus arbiter;(priority or round robin), driving the 16 MHz .i.SYSCLK; signal, starting the.i.IACK daisy chain;, and detecting and terminating .i.bus timeout;s. Once theEPC-2 sees either of the DS0 and DS1 lines asserted, a counter is started. Ifthe counter expires before both DS0 and DS1 are deasserted, the EPC-2 assertsthe VMEbus .i.BERR; signal until both data strobes are deasserted. The durationof the counter is approximately 100-120 microseconds.Reset BehaviorArtisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com |
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