Datasheet
6−4
6.3 Socket Present-State Register
The socket present-state register reports information about the socket interface. Write transactions to the socket force
event register (CB offset 0Ch, see Section 6.4) are reflected here, as well as general socket interface status.
Information about PC Card V
CC
support and card type is only updated at each insertion. Also note that the PCI1520
uses CCD1
and CCD2 during card identification, and changes on these signals during this operation are not reflected
in this register. See Table 6−4 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 present-state
Type R R R R R R R R R R R R R R R R
Default 0 0 1 1 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 present-state
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 X 0 0 0 X X X
Register: Socket present-state
Offset: CardBus socket address + 08h
Type: Read-only
Default: 3000 00XXh
Table 6−4. Socket Present-State Register Description
BIT SIGNAL TYPE FUNCTION
31 YVSOCKET R
YV socket. Bit 31 indicates whether or not the socket can supply V
CC
= Y.Y V to PC Cards. The PCI1520
does not support Y.Y-V V
CC
; therefore, this bit is always reset unless overridden by the socket force event
register (CB offset 0Ch, see Section 6.4). This bit is hardwired to 0.
30 XVSOCKET R
XV socket. Bit 30 indicates whether or not the socket can supply V
CC
= X.X V to PC Cards. The PCI1520
does not support X.X-V V
CC
; therefore, this bit is always reset unless overridden by the socket force event
register (CB offset 0Ch, see Section 6.4). This bit is hardwired to 0.
29 3VSOCKET R
3-V socket. Bit 29 indicates whether or not the socket can supply V
CC
= 3.3 V to PC Cards. The PCI1520
does support 3.3-V V
CC
; therefore, this bit is always set unless overridden by the socket force event
register (CB offset 0Ch, see Section 6.4).
28 5VSOCKET R
5-V socket. Bit 28 indicates whether or not the socket can supply V
CC
= 5 V to PC Cards. The PCI1520
does support 5-V V
CC
; therefore, this bit is always set unless overridden by the socket force event register
(CB offset 0Ch, see Section 6.4).
27 ZVSUPPORT R Zoomed-video support. This bit indicates whether or not the socket has support for zoomed video.
0 = Zoomed video is not supported.
1 = Zoomed video is supported.
26−14 RSVD R Reserved. Bits 27−14 return 0s when read.
13 YVCARD R
YV card. Bit 13 indicates whether or not the PC Card inserted in the socket supports V
CC
= Y.Y V.
0 = Y.Y-V V
CC
is not supported.
1 = Y.Y-V V
CC
is supported.
12 XVCARD R
XV card. Bit 12 indicates whether or not the PC Card inserted in the socket supports V
CC
= X.X V.
0 = X.X-V V
CC
is not supported.
1 = X.X-V V
CC
is supported.
11 3VCARD R
3-V card. Bit 11 indicates whether or not the PC Card inserted in the socket supports V
CC
= 3.3 V.
0 = 3.3-V V
CC
is not supported.
1 = 3.3-V V
CC
is supported.