Table 3−9. Interrupt Mask and Flag Registers
CARD TYPE
EVENT
MASK
FLAG
Battery conditions (BVD1, BVD2)
Wait states (READY)
ExCA offset 05h/45h/805h bits 1 and 0 ExCA offset 04h/44h/804h bits 1 and 0
16-bit memory
16-bit I/O
ExCA offset 05h/45h/805h bit 2
ExCA offset 05h/45h/805h bit 0
ExCA offset 04h/44h/804h bit 2
ExCA offset 04h/44h/804h bit 0
Change in card status (STSCHG)
16-bit I/O/
UltraMedia
Interrupt request (IREQ)
Always enabled
PCI configuration offset 91h bit 0
All 16-bit PC
Cards/
Smart Card
adapters/
Power cycle complete
ExCA offset 05h/45h/805h bit 3
ExCA offset 04h/44h/804h bit 3
UltraMedia/
Flash Media
Change in card status (CSTSCHG)
Interrupt request (CINT)
Socket mask bit 0
Always enabled
Socket event bit 0
PCI configuration offset 91h bit 0
Socket event bit 3
CardBus
Power cycle complete
Socket mask bit 3
Socket mask bits 2 and 1
Card insertion or removal
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 3−10. PC Card Interrupt Events and Description
CARD TYPE
EVENT
TYPE
SIGNAL
DESCRIPTION
A transition on BVD1 indicates a change in the
PC Card battery conditions.
BVD1(STSCHG)//CSTSCHG
Battery conditions
(BVD1, BVD2)
CSC
A transition on BVD2 indicates a change in the
PC Card battery conditions.
BVD2(SPKR)//CAUDIO
READY(IREQ)//CINT
16-bit
memory
A transition on READY indicates a change in the
ability of the memory PC Card to accept or provide
data.
Wait states
(READY)
CSC
Change in card
status (STSCHG)
The assertion of STSCHG indicates a status change
on the PC Card.
16-bit I/O
CSC
Functional
CSC
BVD1(STSCHG)//CSTSCHG
READY(IREQ)//CINT
16-bit I/O/
UltraMedia
Interrupt request
(IREQ)
The assertion of IREQ indicates an interrupt request
from the PC Card.
Change in card
status (CSTSCHG)
The assertion of CSTSCHG indicates a status
change on the PC Card.
BVD1(STSCHG)//CSTSCHG
READY(IREQ)//CINT
CardBus
Interrupt request
(CINT)
The assertion of CINT indicates an interrupt request
from the PC Card.
Functional
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/
Smart Card
adapters/
UltraMedia/
Flash Media
Card insertion
or removal
CD1//CCD1,
CD2//CCD2
CSC
CSC
Power cycle
complete
An interrupt is generated when a PC Card power-up
cycle has completed.
N/A
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 (//).
The 1997 PC Card Standard describes the power-up sequence that must be followed by the PCI6x21/PCI6x11
controller when an insertion event occurs and the host requests that the socket V
and V
be powered. Upon
CC
PP
completion of this power-up sequence, the PCI6x21/PCI6x11 interrupt scheme can be used to notify the host system
(see Table 3−10), denoted by the power cycle complete event. This interrupt source is considered a
3−16
TI [ TEXAS INSTRUMENTS ]
