MPC8540 datasheet(410/1302 Pages) FREESCALE

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

10-6

Freescale Semiconductor

Programmable Interrupt Controller

10.1.4.2 Pass-Through Mode (GCR[M] = 0)

The PIC unit provides a mechanism to support alternate external interrupt controllers such as the

PC/AT compatible 8259 interrupt controller architecture. After a hard reset, the PIC unit defaults

to pass-through mode, in which active-high interrupts from external source IRQ0 are passed

directly to the e500 core, as shown in Table 10-2, all other external interrupt signals are ignored.

Thus, the interrupt signal from an external interrupt controller can be connected to IRQ0 and cause

direct interrupts to the processor. The PIC does not perform a vector fetch from an 8259 interrupt

controller.

Figure 10-2. Pass-Through Mode Example

When pass-through mode is enabled, the internally-generated interrupts shown in Table 10-4 are

not forwarded to the e500 core. Instead, the PIC passes the raw interrupts from the internal sources

to IRQ_OUT.

Note that in pass-through mode, interrupts generated by the PIC itself (global timers,

interprocessor, and message register interrupts) cannot be used. If internal or PIC-generated

interrupts must be reported internally to the processor, pass-through mode must be disabled.

10.1.5 Interrupt Sources

Aside from the sources of machine check, unconditional debug event, and reset interrupts to the

core described in Table 10-2, the PIC unit can receive 47 separate interrupts from five different

sources as follows:

•

12 external—Off-chip signals, IRQ[0:11]

•

23 internal—On-chip. Sources are L2, ECM, DDR, local bus controller, DMA, PCI/PCI-X,

RapidIO, TSEC, FEC, DUART, performance monitor, and I

•

4 global timers—From inside the PIC

IRQ_OUT

MPC8540 Internal

interrupts (see Table 10-4)

(not including

PIC-generated interrupts)

PIC

e500 Core

IRQ0

External

PC/AT-Compatible

8259 Interrupt

Controller

MPC8540

GCR[M] = 0

IRQ[1:11]

(Disabled)

int

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