82596Ca Lanc Interrupt Control Register - Motorola MVME172 Programmer's Reference Manual

82596CA LANC Interrupt Control Register

ADR/SIZ
BIT 15
NAME PLTY
OPER R/W
RESET 0 PL
IL2-IL0
ICLR
IEN
INT
E/L*
PLTY
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$FFF42028 (8 bits)
14 13 12
E/L* INT IEN
R/W R R/W
0 PL 0 PL 0 PL
Interrupt Request Level. These three bits select the
interrupt level for the 82596CA LANC. Level 0 does not
generate an interrupt.
In edge-sensitive mode, writing a logic 1 to this bit clears
the INT status bit. This bit has no function in level-
sensitive mode. This bit is always read as zero.
Interrupt Enable. When this bit is set high, the interrupt is
enabled. The interrupt is disabled when this bit is low.
This status bit reflects the state of the INT pin from the
LANC (qualified by the IEN bit). When this bit is high, a
LANC INT interrupt is being generated at the level
programmed in
IL2-IL0.
Edge or Level. When this bit is high, the interrupt is edge-
sensitive. The interrupt is level-sensitive when this bit is
low.
Polarity. When this bit is low, interrupt is activated by a
rising edge/high level of the LANC INT pin. When this bit
is high, interrupt is activated by a falling edge/low level of
the LANC INT pin. Note that if this bit is changed while
the E/L* bit is set (or is being set), a LANC interrupt may
be generated. This can be avoided by setting the ICLR bit
during write cycles that change the E/L* bit.
Programming Model
11 10 9
ICLR IL2 IL1
C R/W R/W
0 0 PL 0 PL
3
8
IL0
R/W
0 PL
3-31