
W83877ATF
Publication Release Date: April 1998
- 6 -
Version 0.51
1.1 Host Interface, continued
SYMBOL
PIN
I/O
FUNCTION
DRQ_C
4
OUT
12t
IN
ts
DMA request signal C.
DACK_C
18
DMA acknowledge signal C.
IRQIN
DRQ_D
IRSL2
IRRXH/IRSL0
93
IN
ts
Interrupt request input.
DMA request signal D.
IR module mode selection 2.
When input, acts as a function of high speed IR receiving
terminal. When output selected, acts as a IR module mode
selection 0.
Detects printer is active, and not external FDC. When this pin
PNF is detected to 1 signal, the device is switched to parallel
printer. When this pin PNF is detected to 0 signal, the device is
switched to external FDC. The pin is configured in
CR16.bit7
(ENPNF)
.
OUT
12t
OUT
12t
I/O
12ts
PNF
IN
ts
IRRXH/IRSL0
3
I/O
12ts
When input pin, high speed IR received terminal. When output
pin, IR module mode select 0. Input or output are definied in
high speed IR register.
DMA acknowledge signal for channel D.
DACK_D
IN
ts
IRSL1
OUT
12t
IN
ts
IR module mode select 1.
TC
97
Terminal Count. When active, this pin indicates termination of
a DMA transfer.
IRQ_A
96
OUT
12t
When CR16 Bit 5 (GOIQSEL) = 0: Interrupt request signal A.
SCI
GIO1
OUT
12t
ACPI interrupt signal, selected by PnP IRQ configure register.
I/O
12t
OUT
12t
When CR16 Bit 4 (GOIQSEL) = 1: General Purpose I/O port 1.
IRQ_B
92
When CR16 Bit 4 (GOIQSEL) = 0: Interrupt request signal B.
GIO0
I/O
12t
OUT
12t
OUT
12t
OUT
12t
OUT
12t
OUT
12t
OUT
12t
OUT
12t
IN
t
When CR16 Bit 4 (GOIQSEL) = 1: General Purpose I/O port 0.
IRQ_C
44
Interrupt request signal C.
IRQ_D
37
Interrupt request signal D.
IRQ_E
23
Interrupt request signal E.
IRQ_F
99
Interrupt request signal F.
IRQ_G
DRQ_D
IRSL2
PCICLK
1
Interrupt request signal G.
DMA request signal channel D.
IR module mode select 2.
PCI clock input when the serial IRQ function is selected.