Preliminary
S3C2451X RISC MICROPROCESSOR
INTERRUPT CONTROLLER
10-1
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
10
INTERRUPT CONTROLLER
OVERVIEW
The interrupt controller in the S3C2451X receives the request from 59 interrupt sources. These interrupt sources
are provided by internal peripherals such as the DMA controller, the UART, IIC, and others. In these interrupt
sources, the UARTn and EINTn interrupts are 'OR'ed to the interrupt controller.
When receiving multiple interrupt requests from internal peripherals and external interrupt request pins, the
interrupt controller requests FIQ or IRQ interrupt of the ARM926EJ core after the arbitration procedure.
The arbitration procedure depends on the hardware priority logic and the result is written to the interrupt pending
register, which helps users notify which interrupt is generated out of various interrupt sources.
Request sources
(with sub -register)
Request sources
(without sub -register)
SRCPND
INTPND
IRQ
FIQ
SUBSRCPND
SUBMASK
MASK
MODE
Priority
Figure 10-1. Interrupt Process Diagram