Specifications

EPC-3305 Hardware Reference

next table defines the bit position to control these features. All bits are active high,

with the exception of the ENUM bit.

IRQ_7 Enables an interrupt on ENUM from the 21554 drawbridge or

CompactPCI backplane. If set to one, an interrupt occurs when ENUM

asserts.

IRQ_11 Enables IRQ 11 when the CPU ejector latch opens. If set to one, IRQ 11

asserts as long as the latch remains in the open position.

INIT Enables an INIT on a soft reset. If set to one, the INIT line to the

processor is strobed on a soft reset. You can use these values:

Disabled A reset source programmed to generate a soft reset does not

reset (INIT) the processor.

Enabled (POR default) Resets (INIT) the processor. Use this to

produce a timed interrupt with no processor reset.

IRQ_10 Enables IRQ_10 on a soft reset. If set to one, IRQ 10 asserts for 63 ms

before the INIT signal to the processor is strobed.

NMI Enables an NMI on a soft reset. If set to one, the NMI line asserts for

63 ms before the INIT signal to the processor is strobed.

CompactPCI features register

The CompactPCI Features register provides a means for software to read:

• CompactPCI geographic address

• CompactPCI SYSEN bit

• RTM present

This register allows software to route CompactPCI interrupts to the local processor.

Note that the CompactPCI backplanes rotate the interrupts from slot to slot. It is up

to software to de-rotate (if required) the source of the interrupts. Slot position can

be determined by reading the Geographical Address from the CPLD.

SYSEN The SYSEN signal from the CompactPCI backplane. This is an active low

signal. If zero it indicated that the CPU card is plugged into the System

Table 4-9. Local interrupt enables

R/W Index Default D7 D6 D5 D4 D3 D2 D1 D0

R/W 0x05 0x04 — IRQ7 — IRQ 11 — INIT IRQ 10 NMI

Plug the EPC-3305 into a system slot only if the system is specifically

designed around the EPC-3305 feature set. The EPC-3305 is not designed

as a system card.

Table 4-10. CompactPCI features register

R/W Index D7 D6 D5 D4 D3 D2 D1 D0

R (D5 R/W) 0x09 SYSEN #RTM _P INTS_ IN GA4 GA3 GA2 GA1 GA0