VT82C686B

Manufacturer Part NumberVT82C686B
ManufacturerETC-unknow
VT82C686B datasheet
 


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Page 17/128:

Universal Serial Bus Interface

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Signal Name
USBP0+
USBP0-
USBP1+
USBP1-
USBP2+
USBP2-
USBP3+
USBP3-
USBCLK
USBOC0# / GPO25 / DACK2# / FDCIRQ
USBOC1# / GPO24 / DRQ2 / FDCDRQ
/ SERIRQ
USBOC0# (SD2 & RFSH#)
USBOC1# (SD1 & RFSH#)
USBOC2# (SD0 & RFSH#)
USBOC3# (SD3 & RFSH#)
USBIRQA / DACK6#
USBIRQB / DACK7#
System Management Bus (SMB) Interface (I
Signal Name
SMBCLK
SMBDATA
SMBALRT# / GPI6
Revision 1.71 June 9, 2000

Universal Serial Bus Interface

Pin #
I/O
Signal Description
A3
IO
USB Port 0 Data +
B3
IO
USB Port 0 Data -
C4
IO
USB Port 1 Data +
D4
IO
USB Port 1 Data -
A4
IO
USB Port 2 Data +
B4
IO
USB Port 2 Data -
B5
IO
USB Port 3 Data +
E6
IO
USB Port 3 Data -
C3
I
USB Clock. 48MHz clock input for the USB interface
G5
I
USB Port 0 Over Current Detect. Port 0 is disabled if low.
USBOC0# if Rx76[7] = 1 and Rx76[6] = 0
H3
I
USB Port 1 Over Current Detect. Port 1 is disabled if this input
is low. Direct inputs are provided for overcurrent protection for
ports 0 and 1 which may be used if the alternate functions of these
two pins are not required. If overcurrent protection is desired on all
four ports (or it is desired to use the alternate functions of these two
pins), an external buffer may be used to drive the state of
USBOC[3-0]# onto SD[3-0] during ISA bus refresh cycles (i.e.,
while ISA bus RFSH# is low, so that RFSH# may be used as the
buffer enable). USCOC1# if Rx76[7] = 1 and Rx76[6] = 0.
(W2)
I
USB Port 0 Over Current Detect
(Y2)
I
USB Port 1 Over Current Detect
(Y1)
I
USB Port 2 Over Current Detect
(Y3)
I
USB Port 3 Over Current Detect
M3
O
USB Interrupt Request A. Output of internal block.
N2
O
USB Interrupt Request B. Output of internal block.
Pin #
I/O
Signal Description
2
U9
IO
SMB / I
C Clock.
2
T9
IO
SMB / I
C Data.
W10
I
SMB Alert. (System Management Bus I/O space Rx08[3] = 1)
When the chip is enabled to allow it, assertion generates an IRQ or
SMI interrupt or a power management resume event. The same pin
is used as General Purpose Input 6 whose value is reflected in
Rx48[6] of function 4 I/O space
-11-
VT82C686B
2
C Bus)
Pinouts