VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


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Page 26/128:

XD Interface

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7HFKQRORJLHV ,QF
Signal Name
Pin #
XDIR / PCS0# / GPO12
T5
Signal Name
Pin #
SERIRQ / DRQ2
H3
/ GPO24
/ FDCDRQ / USBOC1#
SERIRQ / DACK5#
L4
/ GPO19 / MC97IRQ
Revision 1.71 June 9, 2000

XD Interface

I/O Signal Description
O
X-Bus Data Direction. (Rx76[1]=0) Asserted low for all I/O read cycles and for
memory read cycles to the programmed BIOS address space. XDIR is tied
directly to the direction control of a 74F245 transceiver that buffers the X-Bus
data and ISA-Bus data. The transceiver output enable may be grounded. SD0-7
connect to the “A” side of the transceiver and XD0-7 connect to the “B” side.
XDIR high indicates that SD0-7 drives XD0-7.
Serial IRQ
I/O Signal Description
I
Serial IRQ (Rx68[3] = 1, Rx74[6] = 0 and Rx75[3] = 1)
I
Serial IRQ (Rx68[3] = 1 and Rx74[6] = 1)
-20-
VT82C686B
Pinouts