FDC37C665GT_07 Datasheet, PDF (6/152 Pages) SMSC Corporation – High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers

PIN NO.
NAME
38 Serial Port
Interrupt
Request
DESCRIPTION OF PIN FUNCTIONS
BUFFER
SYMBOL TYPE
DESCRIPTION
IRQ4
O24 FDC37C665GT (Motherboard application):
IRQ4 is the interrupt from the Primary Serial
Port (PSP) or Secondary Serial Port (SSP)
when the PSP or SSP have their address
programmed as COM1 or COM3 (as
defined in the Configuration Registers). The
appropriate interrupt from the Serial Port is
enabled/disabled via the Interrupt Enable
Register (IER). The interrupt is reset
inactive after interrupt service. It is disabled
through IER or hardware reset.
Primary Serial
Port Interrupt
PSPIRQ
37 Serial Port
Interrupt
Request
IRQ3
O24 FDC37C666GT (Adapter application):
PSPIRQ is a source of PSP interrupt.
Externally, it should be connected to either
IRQ3 or IRQ4 on PC/AT via jumpers.
O24 FDC37C665GT (Motherboard application):
IRQ3 is the interrupt from the Primary Serial
Port (PSP) or secondary Serial Port (SSP)
when the PSP or SSP have their address
programmed as COM2 or COM4 (as
defined in the Configuration Registers). The
appropriate interrupt from the Serial Port is
enabled/disabled via the Interrupt Enable
Register (IER). The interrupt is reset
inactive after interrupt service. It is disabled
through IER or hardware reset.
Secondary Serial SSPIRQ
Port Interrupt
40 Floppy
Controller
Interrupt
Request
FINTR
O24 FDC37C666GT (Adapter application):
SSPIRQ is a source of SSP interrupt.
Externally, it should be connected to either
IRQ3 or IRQ4 on PC/AT via jumpers.
O24 This interrupt from the Floppy Disk
Controller is enabled/disabled via bit 3 of the
Digital Output Register (DOR).
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