參數(shù)資料
型號： PCI1620GHK
英文描述： Controller Miscellaneous - Datasheet Reference
中文描述： 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù)： 60/164頁
文件大?。?/td> 720K
代理商： PCI1620GHK
3
–
18
Table 3
–
12. PC Card Interrupt Events and Description
CARD TYPE
EVENT
TYPE
SIGNAL
DESCRIPTION
Battery conditions
(BVD1, BVD2)
CSC
BVD1(STSCHG)//CSTSCHG
A transition on BVD1 indicates a change in the
PC Card battery conditions.
16-bit
memory
BVD2(SPKR)//CAUDIO
A transition on BVD2 indicates a change in the
PC Card battery conditions.
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/
UltraMedia
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.
Interrupt request
(CINT)
Functional
READY(IREQ)//CINT
The assertion of CINT indicates an interrupt request
from the PC Card.
All PC Cards/
Smart Card
adapters/
ada ters/
UltraMedia/
Flash Media
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.
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 (//).
The
1997 PC Card Standard
describes the power-up sequence that must be followed by the PCI1620 when an
insertion event occurs and the host requests that the socket V
CC
and V
PP
be powered. Upon completion of this
power-up sequence, the PCI1620 interrupt scheme can be used to notify the host system (see Table 3
–
12), denoted
by the power cycle complete event. This interrupt source is considered a PCI1620 internal event, because it depends
on the completion of applying power to the socket rather than on a signal change at the PC Card interface.
3.6.2
Interrupt Masks and Flags
Host software may individually mask (or disable) most of the potential interrupt sources listed in Table 3
–
12 by setting
the appropriate bits in the PCI1620. By individually masking the interrupt sources listed, software can control those
events that cause a PCI1620 interrupt. Host software has some control over the system interrupt the PCI1620 asserts
by programming the appropriate routing registers. The PCI1620 allows host software to route PC Card CSC and PC
Card functional interrupts to separate system interrupts. Interrupt routing somewhat specific to the interrupt signaling
method used is discussed in more detail in the following sections.
When an interrupt is signaled by the PCI1620, the interrupt service routine must determine which of the events listed
in Table 3
–
11 caused the interrupt. Internal registers in the PCI1620 provide flags that report the source of an interrupt.
By reading these status bits, the interrupt service routine can determine the action to be taken.
Table 3
–
11 details the registers and bits associated with masking and reporting potential interrupts. All interrupts can
be masked except the functional PC Card interrupts, and an interrupt status flag is available for all types of interrupts.
Notice that there is not a mask bit to stop the PCI1620 from passing PC Card functional interrupts through to the
appropriate interrupt scheme. These interrupts are not valid until the card is properly powered, and there should never
be a card interrupt that does not require service after proper initialization.
Table 3
–
11 lists the various methods of clearing the interrupt flag bits. The flag bits in the ExCA registers (16-bit PC
Card-related interrupt flags) can be cleared using two different methods. One method is an explicit write of 1 to the
flag bit to clear and the other is by reading the flag bit register. The selection of flag bit clearing methods is made by
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