Specifications

IRQ15 unassigned
The assignment of .i.DMA channels; is shown in the following table.
0 unassigned
1 .i.GPIB controller;
2 .i.floppy disk controller;
3 .i.SCSI controller;
5 unassigned
6 unassigned
7 unassigned
Watchdog Timer
EPC-2 contains a continually running timer having a period of either about 0.2
or 6.7 seconds (software selectable). The .i.watchdog timer; event is generated
whenever the period expires. This event may be enabled as a source of the IRQ10
interrupt, or as a hardware .i.reset;. The timer is reset to its maximum value
by an I/O read of the .i.module status/control register;.
EXMbus
This section applies to only the EPC-2x.
A subset of the .i.EXMbus;, an I/O expansion bus, is provided at the rear of a
front-panel slot in the EPC-2x. .i.EXMID signal;The EXMbus is very similar to
the .i.PC/AT I/O bus;. In addition, it contains a signal -EXMID used for
dynamic recognition and configuration of EXMs. EXMs respond to one or more I/O
addresses 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 in
response 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 only
interrupt IRQ3 is available.
Further information on the EXMbus, its connectors, and standards for building
EXMs is available upon request.
VXIbus Interface
.i.VMEbus interface;.i.P1 connector;.i.J1 connector;.i.P2 connector;.i.J2
connector;The EPC-2 module connects to the VXIbus J1 and J2 connectors in the
left of the two slots occupied by the EPC-2.
On the P1 connector, the EPC-2 uses all of the defined VME/VXI lines except
SERCLK
SERDAT
+5V STDBY
On the P2 connector, the EPC-2 uses all of the defined VXIbus lines except
SUMBUS
LBUSC00-LBUSC11
RSV1,RSV2,RSV3
+24V,-24V
Slot 0 and System Controller Functions
When the EPC-2 is configured as the .i.slot 0 controller;, it performs the VXI
slot-0 functions and the VME .i.system controller; functions.
The slot-0 functions consist of generation of the CLK10 signals and MODID
support.
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 the
EPC-2 sees either of the DS0 and DS1 lines asserted, a counter is started. If
the counter expires before both DS0 and DS1 are deasserted, the EPC-2 asserts
the VMEbus .i.BERR; signal until both data strobes are deasserted. The duration
of the counter is approximately 100-120 microseconds.
Reset Behavior
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