Datasheet

3−14
Table 3−7 summarizes the sources of PC Card interrupts and the type of card associated with them. CSC and
functional interrupt sources are dependent on the type of card inserted in the PC Card socket. The three types of cards
that can be inserted into any PC Card socket are:
• 16-bit memory card
• 16-bit I/O card
• CardBus cards
Table 3−7. Interrupt Mask and Flag Registers
CARD TYPE EVENT MASK FLAG
16-bit memory
Battery conditions (BVD1, BVD2) ExCA offset 05h/45h/805h bits 1 and 0 ExCA offset 04h/44h/804h bits 1 and 0
16-bit memory
Wait states (READY) ExCA offset 05h/45h/805h bit 2 ExCA offset 04h/44h/804h bit 2
16-bit I/O
Change in card status (STSCHG) ExCA offset 05h/45h/805h bit 0 ExCA offset 04h/44h/804h bit 0
16-bit I/O
Interrupt request (IREQ) Always enabled PCI configuration offset 91h bit 0
All 16-bit PC
Cards
Power cycle complete ExCA offset 05h/45h/805h bit 3 ExCA offset 04h/44h/804h bit 3
Change in card status (CSTSCHG) Socket mask bit 0 Socket event bit 0
CardBus
Interrupt request (CINT) Always enabled PCI configuration offset 91h bit 0
CardBus
Power cycle complete Socket mask bit 3 Socket event bit 3
Card insertion or removal Socket mask bits 2 and 1 Socket event bits 2 and 1
Functional interrupt events are valid only for 16-bit I/O and CardBus cards; that is, the functional interrupts are not
valid for 16-bit memory cards. Furthermore, card insertion and removal-type CSC interrupts are independent of the
card type.
Table 3−8. PC Card Interrupt Events and Description
CARD TYPE EVENT TYPE SIGNAL DESCRIPTION
Battery conditions
CSC
BVD1(STSCHG)//CSTSCHG
A transition on BVD1 indicates a change in the
PC Card battery conditions.
16-bit
memory
Battery conditions
(BVD1, BVD2)
CSC
BVD2(SPKR)//CAUDIO
A transition on BVD2 indicates a change in the
PC Card battery conditions.
memory
Wait states
(READY)
CSC READY(IREQ)//CINT
A transition on READY indicates a change in the
ability of the memory PC Card to accept or provide
data.
16-bit I/O
Change in card
status (STSCHG
)
CSC BVD1(STSCHG)//CSTSCHG
The assertion of STSCHG indicates a status change
on the PC Card.
16-bit I/O
Interrupt request
(IREQ
)
Functional READY(IREQ)//CINT
The assertion of IREQ indicates an interrupt request
from the PC Card.
CardBus
Change in card
status (CSTSCHG)
CSC BVD1(STSCHG)//CSTSCHG
The assertion of CSTSCHG indicates a status
change on the PC Card.
CardBus
Interrupt request
(CINT
)
Functional READY(IREQ)//CINT
The assertion of CINT indicates an interrupt request
from the PC Card.
All PC Cards
Card insertion
or removal
CSC
CD1//CCD1,
CD2
//CCD2
A transition on either CD1//CCD1 or CD2//CCD2
indicates an insertion or removal of a 16-bit or
CardBus PC Card.
All PC Cards
Power cycle
complete
CSC N/A
An interrupt is generated when a PC Card power-up
cycle has completed.
The naming convention for PC Card signals describes the function for 16-bit memory, I/O cards, and CardBus. For
example, READY(IREQ
)//CINT includes READY for 16-bit memory cards, IREQ for 16-bit I/O cards, and CINT for
CardBus cards. The 16-bit memory card signal name is first, with the I/O card signal name second, enclosed in
parentheses. The CardBus signal name follows after a double slash (//).