Acer 390 Series Service Manual page 62

Table 2-2 PCI1250 Terminal Functions
Name
System Interrupt Terminals
GPIO3/INTA V13
IRQSER/INTB W13
IRQMUX7 Y12
IRQMUX6 U11
IRQMUX5 W10
IRQMUX4 Y09
IRQMUX3 W09
IRQMUX2 V09
IRQMUX1 U09
IRQMUX0 Y08
RI-OUT/PME Y13
PC Card Power Switch Terminals
LATCH W13
2-16
No. I/O Type
I/O
I/O
O
O
O
Function
GPI03/lNTA Parallel PCI Interrupt. This terminal
can be connected to an available PCI interrupt if
parallel PCI interrupts are used, and the PCI1250A
will output PCI INTA through this terminal. Refer to
the Interrupt Subsystem description in this
document for details on interrupt signaling. This
terminal defaults to a general purpose input
IRQSER Serial Interrupt Signal / INTB Parallel PCI
Interrupt. When this terminal is configured as
IRQSER, it provides the IRQSER style serial
interrupting scheme. Serialized PCI interrupts can
also be sent in the IRQSER stream. This terminals
can be configured as the parallel PCI INTB
interrupt. Refer to the Interrupt Subsystem
description in this document for details on interrupt
signaling. This terminal defaults to the IRQSER
signal since this is the default interrupt signaling
method
The primary function of these terminals is to
provide the ISA type IRQ signaling supported by the
PCl1250A. These Interrupt mux outputs can be
mapped to any of 15 IRQs. The Device Control
register must be programmed for the ISA IRQ
interrupt mode and the IRQMUX Routing Register
must have the IRQ routing programmed before
these terminals are enabled.
All of these terminals have secondary functions,
such as PC/PCI DMA request/grant, ring indicate
output, and zoom video status. that can be
selected; with the appropriate programming of this
register. When the secondary functions are
enabled, the respective terminals are not available
for IRQ routing.
See the IRQMUX Routing register for programming
options
Ring indicate Output/Power Management Event.
RI_OUT allows the RI input from one of the PC
Cards to pass through o the system. This pin is the
RI_OUT signal when the PCI1250A is in the D0
(fully on) state and provides the PME signal when
the device is in a D1, D2, or D3 state.
IRQMUX4 or IRQMUX3 can be used to route the
RI_OUT signal when the PME signal is routed on
pin Y13 and a PC Card requires a ring indicate
signal
3-Line power Switch latch. This signal is asserted
by the PCI1250A to indicate to the PC Card power
switch that the data on the DATA line is valid.
Service Guide