PCI1451 Datasheet, PDF (118/141 Pages) Texas Instruments – PC Card Controller

6.3 Socket Present State Register
This register reports information about the socket interface. Writes to the socket force event register (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 PCI1451 uses the CCD1 and CCD2 signals during card
identification, and changes on these signals during this operation are not reflected in this register.
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
Type:
Read-only
Offset:
CardBus Socket Address + 08h
Default: 3000 00XXh
BIT
31
30
29
28
27–14
13
12
11
10
9
8
7
SIGNAL
YVSOCKET
XVSOCKET
3VSOCKET
5VSOCKET
RSVD
YVCARD
XVCARD
3VCARD
5VCARD
BADVCCREQ
DATALOST
NOTACARD
Table 6–4. Socket Present State Register Description
TYPE
FUNCTION
R
YV socket. This bit indicates whether or not the socket can supply VCC = Y.YV to PC Cards. The PCI1451
does not support Y.YV VCC; therefore, this bit is hardwired to 0.
R
XV socket. This bit indicates whether or not the socket can supply VCC = X.XV to PC Cards. The PCI1451
does not support X.XV VCC; therefore, this bit is hardwired to 0.
3-V socket. This bit indicates whether or not the socket can supply VCC = 3.3 Vdc to PC Cards. The
R PCI1451 does support 3.3 V VCC; therefore, this bit is always set unless overridden by the socket force
event register (see Section 6.4).
5-V socket. This bit indicates whether or not the socket can supply VCC = 5.0 Vdc to PC Cards. The
R PCI1451 does support 5.0 V VCC; therefore, this bit is always 1 unless overridden by the device control
register (bit 6) (see Section 4.39).
R These bits return 0s when read.
R
YV card. This bit indicates whether or not the PC Card inserted in the socket supports VCC = Y.Y Vdc. This
bit can be set by writing to the corresponding bit in the socket force event register (see Section 6.4).
R
XV card. This bit indicates whether or not the PC Card inserted in the socket supports VCC = X.X Vdc. This
bit can be set by writing to the corresponding bit in the socket force event register (see Section 6.4).
R
3-V card. This bit indicates whether or not the PC Card inserted in the socket supports VCC = 3.3 Vdc. This
bit can be set by writing to the F3VCARD bit in the socket force event register (see Section 6.4).
R
5-V card. This bit indicates whether or not the PC Card inserted in the socket supports VCC = 5.0 Vdc. This
bit can be set by writing to the F5VCARD bit in the socket force event register (see Section 6.4).
Bad VCC request. This bit indicates that the host software has requested that the socket be powered at
an invalid voltage.
R
0 = Normal operation (default)
1 = Invalid VCC request by host software
Data lost. This bit indicates that a PC Card removal event may have caused lost data because the cycle
did not terminate properly or because write data still resides in the PCI1451.
R
0 = Normal operation (default)
1 = Potential data loss due to card removal
Not a card. This bit indicates that an unrecognizable PC Card has been inserted in the socket. This bit is
not updated until a valid PC Card is inserted into the socket.
R
0 = Normal operation (default)
1 = Unrecognizable PC Card detected
6–4