LAN9117_08 Datasheet, PDF (74/136 Pages) SMSC Corporation – High Performance Single-Chip 10/100 Non-PCI Ethernet Controller

5.3.2
High Performance Single-Chip 10/100 Non-PCI Ethernet Controller
IRQ_CFG—Interrupt Configuration Register
Datasheet
Offset:
54h
Size:
32 bits
This register configures and indicates the state of the IRQ signal.
BITS
31:24
23-15
14
13
12
11-9
8
7-5
4
3-1
0
DESCRIPTION
TYPE
Interrupt Deassertion Interval (INT_DEAS). This field determines the
Interrupt Deassertion Interval for the Interrupt Request in multiples of 10
microseconds.
Writing zeros to this field disables the INT_DEAS Interval and resets the
interval counter. Any pending interrupts are then issued. If a new, non-
zero value is written to the INT_DEAS field, any subsequent interrupts
will obey the new setting.
Note: The Interrupt Deassertion interval does not apply to the PME
interrupt.
Reserved
Interrupt Deassertion Interval Clear (INT_DEAS_CLR). Writing a one
to this register clears the de-assertion counter in the IRQ Controller, thus
causing a new de-assertion interval to begin (regardless of whether or
not the IRQ Controller is currently in an active de-assertion interval).
Interrupt Deassertion Status (INT_DEAS_STS). When set, this bit
indicates that the INT_DEAS is currently in a deassertion interval, and
any interrupts (as indicated by the IRQ_INT and INT_EN bits) will not be
delivered to the IRQ pin. When cleared, the INT_DEAS is currently not
in a deassertion interval, and enabled interrupts will be delivered to the
IRQ pin.
Master Interrupt (IRQ_INT). This read-only bit indicates the state of the
internal IRQ line. When set high, one of the enabled interrupts is
currently active. This bit will respond to the associated interrupts
regardless of the IRQ_EN field. This bit is not affected by the setting of
the INT_DEAS field.
Reserved
IRQ Enable (IRQ_EN) – This bit controls the final interrupt output to the
IRQ pin. When cleared, the IRQ output is disabled and will be
permanently deasserted. This bit only controls the external IRQ signal,
and has no effect on any of the internal interrupt status bits.
Reserved
IRQ Polarity (IRQ_POL) – When cleared, enables the IRQ line to
function as an active low output. When set, the IRQ output is active high.
When IRQ is configured as an open-drain output this field is ignored,
and the interrupt output is always active low.
Reserved
IRQ Buffer Type (IRQ_TYPE) – When cleared, enables IRQ to function
as an open-drain buffer for use in a Wired-Or Interrupt configuration.
When set, the IRQ output is a Push-Pull driver. When configured as an
open-drain output the IRQ_POL field is ignored, and the interrupt output
is always active low.
R/W
RO
SC
SC
RO
RO
R/W
RO
R/W
NASR
RO
R/W
NASR
DEFAULT
0
-
0
0
0
-
0
-
0
-
0
Revision 1.5 (07-11-08)
74
DATASHEET
SMSC LAN9117