Intel E3815 FH8065301567411 데이터 시트
제품 코드
FH8065301567411
PCU – iLB – 8259 Programmable Interrupt Controllers (PIC)
Intel
®
Atom™ Processor E3800 Product Family
Datasheet
5295
42.1.4.2
Special Fully-Nested Mode
This mode is used in the case of a system where cascading is used, and the priority has
to be conserved within each slave. In this case, the special fully-nested mode is
programmed to the master controller. This mode is similar to the fully-nested mode
with the following exceptions:
to be conserved within each slave. In this case, the special fully-nested mode is
programmed to the master controller. This mode is similar to the fully-nested mode
with the following exceptions:
•
When an interrupt request from a certain slave is in service, this slave is not locked
out from the master's priority logic and further interrupt requests from higher
priority interrupts within the slave are recognized by the master and initiate
interrupts to the processor. In the normal-nested mode, a slave is masked out
when its request is in service.
out from the master's priority logic and further interrupt requests from higher
priority interrupts within the slave are recognized by the master and initiate
interrupts to the processor. In the normal-nested mode, a slave is masked out
when its request is in service.
•
When exiting the Interrupt Service routine, software has to check whether the
interrupt serviced was the only one from that slave. This is done by sending a Non-
Specific EOI command to the slave and then reading its ISR. If it is 0, a non-
specific EOI can also be sent to the master.
interrupt serviced was the only one from that slave. This is done by sending a Non-
Specific EOI command to the slave and then reading its ISR. If it is 0, a non-
specific EOI can also be sent to the master.
42.1.4.3
Automatic Rotation Mode (Equal Priority Devices)
In some applications, there are a number of interrupting devices of equal priority.
Automatic rotation mode provides for a sequential 8-way rotation. In this mode, a
device receives the lowest priority after being serviced. In the worst case, a device
requesting an interrupt has to wait until each of seven other devices are serviced at
most once.
Automatic rotation mode provides for a sequential 8-way rotation. In this mode, a
device receives the lowest priority after being serviced. In the worst case, a device
requesting an interrupt has to wait until each of seven other devices are serviced at
most once.
There are two ways to accomplish automatic rotation using OCW2.REOI; the Rotation
on Non-Specific EOI Command (OCW2.REOI=101b) and the rotate in automatic EOI
mode which is set by (OCW2.REOI=100b).
on Non-Specific EOI Command (OCW2.REOI=101b) and the rotate in automatic EOI
mode which is set by (OCW2.REOI=100b).
42.1.4.4
Specific Rotation Mode (Specific Priority)
Software can change interrupt priorities by programming the bottom priority. For
example, if IRQ5 is programmed as the bottom priority device, then IRQ6 is the highest
priority device. The Set Priority Command is issued in OCW2 to accomplish this, where:
OCW2.REOI=11xb, and OCW2.ILS is the binary priority level code of the bottom
priority device.
example, if IRQ5 is programmed as the bottom priority device, then IRQ6 is the highest
priority device. The Set Priority Command is issued in OCW2 to accomplish this, where:
OCW2.REOI=11xb, and OCW2.ILS is the binary priority level code of the bottom
priority device.
In this mode, internal status is updated by software control during OCW2. However, it
is independent of the EOI command. Priority changes can be executed during an EOI
command by using the Rotate on Specific EOI Command in OCW2 (OCW2.REOI=111b)
and OCW2.ILS=IRQ level to receive bottom priority.
is independent of the EOI command. Priority changes can be executed during an EOI
command by using the Rotate on Specific EOI Command in OCW2 (OCW2.REOI=111b)
and OCW2.ILS=IRQ level to receive bottom priority.
42.1.4.5
Poll Mode
Poll mode can be used to conserve space in the interrupt vector table. Multiple
interrupts that can be serviced by one interrupt service routine do not need separate
vectors if the service routine uses the poll command. Poll mode can also be used to
expand the number of interrupts. The polling interrupt service routine can call the
appropriate service routine, instead of providing the interrupt vectors in the vector
interrupts that can be serviced by one interrupt service routine do not need separate
vectors if the service routine uses the poll command. Poll mode can also be used to
expand the number of interrupts. The polling interrupt service routine can call the
appropriate service routine, instead of providing the interrupt vectors in the vector