
W83977ATF
PRELIMINARY
Publication Release Date: April 1998
-8-
Revision 0.52
1.1 Host Interface, continued
SYMBOL
PIN
I/O
FUNCTION
IRQ6
GP34
95
OUT
12t
I/O
12t
Interrupt request 6. (Logical device 9, CRF1 bit 2 = 0)
General purpose I/O port 3 bit 4.
(Logical device 9, CRF1 bit 2 = 1)
IRQ7
GP35
94
OUT
12t
I/O
12t
Interrupt request 7. (Logical device 9, CRF1 bit 2 = 0)
General purpose I/O port 3 bit 5.
(Logical device 9, CRF1 bit 2 = 1)
IRQ8
GP36
93
OUT
12t
I/O
12t
Interrupt request 8. (Logical device 9, CRF1 bit 2 = 0)
General purpose I/O port 3 bit 6.
(Logical device 9, CRF1 bit 2 = 1)
IRQ9
GP37
92
OUT
12t
I/O
12t
Interrupt request 9. (Logical device 9, CRF1 bit 2 = 0)
General purpose I/O port 3 bit 7.
(Logical device 9, CRF1 bit 2 = 1)
IRQ10
SERIRQ
100
OUT
12t
I/O
12t
OUT
12t
IN
t
OUT
12t
I/O
12t
Interrupt request 10. (Logical device 9, CRF1 bit 2 = 0)
Serial IRQ input/output. (Logical device 9, CRF1 bit 2 = 1)
IRQ11
PCICLK
101
Interrupt request 11. (Logical device 9, CRF1 bit 2 = 0)
PCI clock input. (Logical device 9, CRF1 bit 2 = 1)
IRQ12
GP26
102
Interrupt request 12. (Logical device 9, CRF1 bit 2 = 0)
General purpose I/O port 2 bit 6.
(Logical device 9, CRF1 bit 2 = 1)
IRQ14
GP14
103
OUT
12t
I/O
12t
Interrupt request 14. (CR2C bit 1_0 = 00, default)
General purpose I/O port 1 bit 4. (CR2C bit 1_0 = 01)
Alternate Function 1 from GP14: General purpose address
decode output.
Alternate Function 2 from GP14: KBC P17 I/O port.
Power LED output. (CR2C bit 1_0 = 10)
(GPACS)
(P17)
PLEDO
OUT
12t
IRQ15
GP15
(GPAWE)
104
OUT
12t
I/O
12t
Interrupt request 15.(CR2C bit 3_2 = 00, default)
General purpose I/O port 1 bit 5. (CR2C bit 3_2 = 01)
Alternate Function 1 from GP15: General purpose address write
enable output.
(P12)
WDT
Alternate Function 2 from GP15: KBC P12 I/O port.
Watch-Dog timer output. (CR2C bit 3_2 = 10)
OUT
12t
CLKIN
1
IN
t
24 or 48 MHz clock input, selectable through CR24 bit 6.