Sharp UP-5300 Service Manual page 50

Signal Name Pin No.
OSC32 C7
CPUCLKIN M5
8-3-4. ISA Interface Signal Set
Signal Name Pin No.
Interrupt Controller Interface
IRQ1 AF18
IRQA/IRQ3 AC19
IRQB/IRQ4 AD19
IRQC/IRQ5 AE19
IRQD/IRQ6 AF19
IRQC/IRQ7 AD20
IRQ8# AE20
IRQF/IRQ9 AF20
IRQG/IRQ10 AB22
IRQH/IRQ11 AC21
IRQ12 AD21
IRQ14 AE21
IRQ15 AF21
IRQSER AE18
Signal Type
Selected By
(Drive)
I
I
Signal Type
Selected By
(Drive)
I PCIDV1
8Ah = 00h
I
I
I
I
I
I PCIDV1
8Bh = 00h
I
I
I
I PCIDV1
8Ch = 00h
I PCIDV1
8Dh = 00h
I PCIDV1
BBh[0] = 0
I/O PCIDV1
BAh[0] = 0
5 – 17
Signal Description
32KHz Clock: This signal is used as a 32KHz clock input. It is used
for power management and is usually the only active clock when the
system is in Suspend mode.
OSC32 is a 5.0V tolerant input, even when its power plane is
connected to 3.3.V as long as the 5VREF pins of FireStar are
connected to +5.0V.
Feedback input to Circuitry: This input clock must be equivalent to,
and in phase with, the clock going to the CPU.
Note: This is a CMOS-level input and therefore it is imperative that
the rise time on this signal is less than or equal to 2.5ns.
Signal Description
Interrupt Request 1: Normally connected to the keyboard controller.
IRQ1 is a 5.0V tolerant input, even when its power plane is
connected to 3.3.V as long as the 5VREF pins of FireStar are
connected to +5.0V.
Programmable Interrupt Request A/IRQ3: This input defaults to
IRQ3, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B0h.
IRQA/IRQ3 is a 5.0V tolerant input, even when its power plane is
connected to 3.3.V as long as the 5VREF pins of FireStar are
connected to +5.0V.
Programmable Interrupt Request B/IRQ4: This input defaults to
IRQ4, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B1h.
IRQB/ITQ4 is a 5.0V tolerant input, even when its power plane is
connected to 3.3.V as long as the 5VREF pins of FireStar are
connected to +5.0V.
Programmable Interrupt Request C/IRQ5: This input defaults to
IRQ5, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B2h.
IRQC/IRQ5 is a 5.0V tolerant input, even when its power plane is
connected to 3.3.V as long as the 5VREF pins of FireStar are
connected to +5.0V.
Programmable Interrupt Request D/IRQ6: This input defaults to
IRQ6, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B3h.
IRQD/IRQ6 is a 5.0V tolerant input, even when its power plane is
connected to 3.3.V as long as the 5VREF pins of FireStar are
connected to +5.0V.
Programmable Interrupt Request E/IRQ7: This input defaults to
IRQ7, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B4h.
Interrupt Request 8: Normally connected to the RTC alarm output.
Programmable Interrupt Request F/IRQ9: This input defaults to
IRQ9, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B5h.
Programmable Interrupt Request G/IRQ10: This input defaults to
IRQ10, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B6h.
Programmable Interrupt Request H/IRQ11: This input defaults to
IRQ11, however, it can be programmed to route onto any ISA or PCI
interrupt through PCIDV1 B7h.
Interrupt Request 12: Normally connected to the mouse interrupt
from the keyboard controller.
Interrupt Request 14: Normally connected to the primary IDE
channel.
Interrupt Request 15: Normally connected to the secondary IDE
channel.
Serial interrupt Request: Bidirectional interrupt line for Compaq
style of serial IRQs.