CL-PD6833
PCI-to-CardBus Host Adapter
6.3
Present State
Register Name: Present State
Memory Offset: 008h
Register Per: socket
Bit 31
Bit 30
Bit 29
Bit 28
Bit 27
Bit 19
Bit 26
Bit 25
Bit 24
Byte 3
Y-V Socket X-V Socket 3.3-V Socket 5-V Socket
Reserved
a
a
a
a
RU
RU
RU
RU
R:0
R:0
R:1
R:1
R:0000
Bit 23
Bit 22
Bit 21
Bit 20
Bit 18
Bit 17
Bit 9
Bit 16
Byte 2
Byte 1
Reserved
R:00000000
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 8
Bad V
Request
CC
Reserved
Y-V Card
X-V Card
3.3-V Card
5-V Card
Data Lost
a
a
a
a
a
RU
RU
RU
RU
RU
R
R:00
R:0
R:0
R:0
R:0
R:0
RC:0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Power
Cycle
CardBus PC 16-Bit PC
CSTSCHG/
WAKEUP
Byte 0
Not a Card
Interrupt
CCD2
CCD1
Card
Card
Complete
a
a
a
a
a
a
a
a
RU
RU
RU
RU
RU
RU
RU
RU
R:0
R:0
R:0
R:0
R:0
R:1
R:1
R:0
a
RU indicates a read update.
The Socket Present State register reflects the present value of the socket status. Some of the bits in this
register are merely reflections of interface signals, while others are flags set to indicate a status change.
Bit 0 — CSTSCHG/WAKEUP
This bit reflects the current status of the CSTSCHG/WAKEUP pin on the CardBus interface.
Bit 1 — CCD1
This bit provides for detection of a PC Card insertion/removal/presence. It is also used by the
CL-PD6833, in conjunction with CVS1, to determine the card type (PC Card 16 vs. PC Card 32).
It is a reflection of the CCD1 pin.
Bit 2 — CCD2
This bit provides for detection of a PC Card insertion/removal/presence. It is also used by the
CL-PD6833, in conjunction with CVS2, to determine the card type (PC Card 16 vs. PC Card 32).
It is a reflection of the CCD2 pin.
Bit 3 — Power Cycle Complete
When this bit is set, it indicates that the interface is powered up.When this bit is cleared, the socket
is powered down. This bit is set to ‘0’ by PCIRST#.
Bit 4 — 16-Bit PC Card
When this bit is set, it indicates that the Card Detect state machine determined a PC Card 16 (R2)
card was inserted. This bit is cleared when another card, one that is not 16-bit, is inserted. This
bit is set to ‘0’ by PCIRST#.
78
June 1998
CARDBUS REGISTERS
ADVANCE DATA BOOK v0.3
CIRRUS [ CIRRUS LOGIC ]
