![](http://datasheet.mmic.net.cn/330000/PCI4510PDV_datasheet_16443873/PCI4510PDV_131.png)
67
6.5
Socket Control Register
This register provides control of the voltages applied to the socket V
PP
and V
CC
. The PCI4510 device ensures that
the socket is powered up only at acceptable voltages when a CardBus card is inserted. See Table 66 for a complete
description of the register contents.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Name
Socket control
Type
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Default
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Socket control
Type
R
R
R
R
R
R
RW
R
RW
RW
RW
RW
R
RW
RW
RW
Default
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
Register:
Offset:
Type:
Default:
Socket control
CardBus Socket Address + 10h
Read-only, Read/Write
0000 0400h
Table 66. Socket Control Register Description
BIT
SIGNAL
TYPE
FUNCTION
3112
RSVD
R
These bits return 0s when read.
11
ZV_ACTIVITY
R
This bit returns 0 when the ZVEN bits (bit 0) for both sockets are 0 (disabled). If either ZVEN bit is
set to 1, then the ZV_ACTIVITY bit returns 1.
10
STANDARDZVREG
R
Standardized zoomed video register model supported. Because the PCI4510 device supports this
register model, this bit is hardwired to 1.
9
ZVEN
RW
Zoomed video enable. This bit enables zoomed video for the socket.
8
RSVD
R
These bits return 0s when read.
7
STOPCLK
RW
This bit controls how the CardBus clock run state machine decides when to stop the CardBus clock
to the CardBus card:
0 = The PCI4510 clock run master tries to stop the clock to the CardBus card under the following
two conditions:
The CardBus interface is idle for eight clocks, and
There is a request from the PCI master to stop the PCI clock.
1 = The PCI4510 clock run master tries to stop the clock to the CardBus card under the following
condition:
The CardBus interface is idle for eight clocks.
In summary, if this bit is set to1, then the CardBus controller tries to stop the clock to the CardBus
card independent of the PCI clock run signal. The only condition that has to be satisfied in this case
is the CardBus interface sampled idle for eight clocks.
64
VCCCTRL
RW
VCC control. These bits are used to request card VCC changes.
000 = Request power off (default)
001 = Reserved
010 = Request VCC = 5 V
011 = Request VCC = 3.3 V
This bit returns 0 when read.
100 = Request VCC = X.X V
101 = Request VCC = Y.Y V
110 = Reserved
111 = Reserved
3
RSVD
R
20
VPPCTRL
RW
VPP control. These bits are used to request card VPP changes.
000 = Request power off (default)
001 = Request VPP = 12 V
010 = Request VPP = 5 V
011 = Request VPP = 3.3 V
100 = Request VPP = X.X V
101 = Request VPP = Y.Y V
110 = Reserved
111 = Reserved