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VIA Technologies, Inc.
Power Control Register ( Read/Write )
Address
: Index ( Base + 02h )
Preliminary
VT83C469
11
B
IT
F
UNCTION
D7
Output Enable.
If this bit set to zero, the PC Card outputs listed below are tri-stated.
CADR<25:0>, D<15:0>, CE2#, CE1#, IORD#, IOWR#, OE#, WE#, REG#, RESET.
This bit should not be set until after this register has been written setting PC Card Power Enable
previously.
Reserved.
Auto Power Switch Enable.
0: automatic socket power switching based on card detects is disable.
1: automatic socket power switching based on card detects is enable.
PC Card Power Enable.
0: power to the socket is disabled.
(Vcc and Vpp1 are all no connection)
1: power to the socket is enabled.
(Vcc is set according to bit 1 in Miscellaneous Control 1 register and DET_5 pin, and Vpp1 is
set according to bit 1:0 in this register)
Reserved
Vpp1 Power Control
00: no connection.
01: Vcc.
10: 12V.
11: reserved.(this setting then Vpp1 will be a no connection)
D6
D5
D4
D[3:2]
D[1:0]
The following table describes the slot power control function.
O
UTPUT
PC
C
ARD
P
OWER
E
NABLE
0
1
1
1
1
1
1
1
1
A
UTO
P
OWER
S
WITCH
E
NABLE
x
0
0
0
0
1
1
1
1
CD1#
CD2#
T
RI
-
STATE
O
UTPUTS
PC
C
ARD
P
OWER
A
CTIVE
0
1
1
1
1
1
1
0
0
x
0
1
x
x
0
1
x
x
x
0
0
x
1
0
0
x
1
x
0
0
1
x
0
0
1
x
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF