SYSTEM MANAGEMENT INTERRUPT (SMI)
The FDC37C93xFR implements a group nSMI they can be accessed through the Index and
output pin. The System Management Interrupt
is a non-maskable interrupt with the highest
priority level used for transparent power
management. The nSMI group interrupt output
consists of the enabled interrupts from each of
the functional blocks in the chip. The interrupts
are enabled onto the group nSMI output via the
SMI Enable Registers 1and 2. The nSMI output
is then enabled onto the group nSMI output pin
via bit[7] in the SMI Enable Register 2.
Data Register.
SMI Enable Registers
SMI Enable Register 1
(Configuration Register B4, Logical Device 8)
This register is used to enable the different
interrupt sources onto the group nSMI output.
SMI Enable Register 2
(Configuration Register B5, Logical Device 8)
This register is used to enable additional
interrupt sources onto the group nSMI output.
This register is also used to enable the group
nSMI output onto the nSMI GPI/O pin and the
routing of 8042 P12 internally to nSMI.
The logic equation for the nSMI output is as
follows:
nSMI = (EN_IDE1 and IRQ_IDE1) or (EN_PINT
and IRQ_PINT) or (EN_U2INT and
IRQ_U2INT) or (EN_U1INT and
IRQ_U1INT)
or
(EN_FINT
and
IRQ_FINT) or (EN_GPINT2 and
IRQ_GPINT2) or (EN_GPINT1 and
IRQ_GPINT1) or (EN_WDT and
SMI Status Registers
SMI Status Register 1
IRQ_WDT)
IRQ_MINT)
IRQ_KINT)
IRQ_IRINT)
IRQ_BINT)
IRQ_ABINT)
or
or
or
or
or
(EN_MINT
(EN_KINT
(EN_IRINT
(EN_BINT
(EN_ABINT
and
and
and
and
and
(Configuration Register B6, Logical Device 8)
This register is used to read the status of the
SMI input events. Note: The status bit gets set
whether or not the interrupt is enabled onto the
group SMI output.
SMI Status Register 2
(Configuration Register B7, Logical Device 8)
This register is used to read the status of the
SMI input events. Note: The status bit gets set
whether or not the interrupt is enabled onto the
group SMI output.
REGISTERS
The following registers can be accessed when in
configuration mode at Logical Device 8,
Registers B4-B7 and when not in configuration
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