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6.4.4
This register controls the assertion of interrupts and power management events, as well as returning the internal status of all
interrupt sources and power management events.
Bits
Description
1:0
Reserved
2
MIO0 Internal State.
This bit reflects the state of the internal MIO[0] signal. The internal MIO[0]
signal reflects the non-inverted or inverted state of MIO0 pin.
2
3
MIO1 Internal State
This bit reflects the state of the internal MIO[1] signal. The internal MIO[1]
reflects the non-inverted or inverted state of MIO1 pin.
2
17-4
Reserved
18
MIO0 Interrupt Enable
When set (1) allows the pin MIO0 to assert an interrupt on the device’s INTA#
(CINT#) pin. The state of the MIO0 signal that causes an interrupt is
dependant upon the polarity set by the register fields MIC(1:0)
19
MIO1 Interrupt Enable
When set (1) allows the pin MIO1 to assert an interrupt on the device’s INTA#
(CINT#) pin. The state of the MIO1 signal that causes an interrupt is
dependant upon the polarity set by the register fields MIC(3:2)
20
Power-down Internal Interrupt Status.
This is a sticky bit. When set, it indicates that a power-down request has been
recognised (validated), which would normally have asserted a powerdown
interrupt on the INTA#(CINT#) pin if GIS bit 21 was set.
Reading this bit clears the Internal Powerdown Interrupt Status.
21
Power-down interrupt enable
.
When set to ‘1’, a powerdown request is allowed to generate an interrupt on
the INTA#/ (CINT# ) pin.
22
UART interrupt status
. 1
This bit reflects the interrupt status of the internal UART.
23
UART Interrupt Enable
.
When set (1) allows the UART to assert an interrupt on the device’s INTA#
(CINT# ) pin
3
24
UART Power Management Event Enable
A value of ‘1’ enables the UART ‘wakeup events to set the PME_Status bit in
the PCI PMCSR register, and hence assert the PME#
(pci
) or CSYSCHG
(
cardbus
) pin if this option has been enabled.
A value of ‘0’ prevents any wakeup events fromthe UART fromsetting the
PCI PME_Status bit.
25
UART Powerdown Filter Control
A ‘1’ enables the UART to invoke a powerdown request via the power down
filter (if the filter is enabled).
31:24
Reserved
Data Sheet Revision 1.1
Page 19
OXCB950
OXFORD SEMICONDUCTOR LTD.
Global Interrupt Status and Control Register ‘GIS’ (Offset 0x0C)
Read/Write
EEPROM
-
-
Reset
PCI
R
R
0x0h
X
-
R
X
-
W
R
RW
0
1
W
RW
1
-
R
X
W
RW
0
-
R
0
W
R/W
1
W
R/W
0
W
R/W
0
-
R
00h