W83877TF/W83877TG
-6 -
Host Interface, continued
SYMBOL PIN I/O FUNCTION
IRQ_ A
96 OUT
12t
Interrupt request signal A, when CR16 Bit 5 (G1IQSEL) = 0.
GIO1 I/O
12t
General Purpose I/O port 1, when CR16 Bit 5 (G1IQSEL) = 1.
IRQ_B
92 OUT
12t
Interrupt request signal B, when CR16 Bit 4 (G0IQSEL) = 0.
GIO0 I/O
12t
General Purpose I/O port 0, when CR16 Bit 4 (G0IQSEL) = 1.
IRQ_C 44 OUT
12t
Interrupt request signal C.
IRQ_D 37 OUT
12t
Interrupt request signal D.
IRQ_E 23 OUT
12t
Interrupt request signal E.
IRQ_F 99 OUT
12t
Interrupt request signal F.
IRQ_G 1 OUT
12t
Interrupt request signal G.
PCICLK IN
t
PCI clock input, when the serial IRQ function is selected.
IRQ_H 91 OUT
12t
Interrupt request signal H.
SERIRQ I/O
12t
Serial interrupt input/output, when the Serial IRQ mode is
selected by setting IRQMODS bit in CR31 register.
SCI
3
OD
12
For the ACPI power management,
SCI
is active low 200ns for
the power management events, which generate an SCI interrupt
in the ACPI mode.
CLKIN 7 IN
t
24MHz/48MHZ clock input. CLKINSEL bit in CR2C register
should be correctly reset/set according to the input frequency.
SMI
8 OD
12
For the legacy power management, the
SMI
is active low 200ns
for the power management events, which generate an SMI
interrupt in the legacy power management mode.
This SMI output is enabled by setting the SMI_EN bit in CR3A
register.
DACK_ A
41 IN
ts
DMA acknowledge signal A.
DRQ_A 39 OUT
12t
DMA request signal A.
