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參數(shù)資料
| 型號： | PCI7610LQFP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PC Card, UltraMedia, and Integrated 1394a-2000 OHCI Two-Port PHY/Link-Layer Controller |
| 中文描述： | PC卡，UltraMedia和集成1394 - 2000 OHCI的雙端口的PHY /鏈路層控制器 |
| 文件頁數(shù)： | 61/240頁 |
| 文件大?。?/td> | 1298K |
| 代理商： | PCI7610LQFP |
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3.8
Programmable Interrupt Subsystem
Interrupts provide a way for I/O devices to let the microprocessor know that they require servicing. The dynamic
nature of PC Cards and the abundance of PC Card I/O applications require substantial interrupt support from the
PCI7610 controller. The PCI7610 controller provides several interrupt signaling schemes to accommodate the needs
of a variety of platforms. The different mechanisms for dealing with interrupts in this controller are based on various
specifications and industry standards. The ExCA register set provides interrupt control for some 16-bit PC Card
functions, and the CardBus socket register set provides interrupt control for the CardBus PC Card functions. The
PCI7610 controller is, therefore, backward compatible with existing interrupt control register definitions, and new
registers have been defined where required.
The PCI7610 controller detects PC Card interrupts and events at the PC Card interface and notifies the host controller
using one of several interrupt signaling protocols. To simplify the discussion of interrupts in the PCI7610 controller,
PC Card interrupts are classified either as card status change (CSC) or as functional interrupts.
The method by which any type of PCI7610 interrupt is communicated to the host interrupt controller varies from
system to system. The PCI7610 controller offers system designers the choice of using parallel PCI interrupt signaling,
parallel ISA-type IRQ interrupt signaling, or the IRQSER serialized ISA and/or PCI interrupt protocol. It is possible
to use the parallel PCI interrupts in combination with either parallel IRQs or serialized IRQs, as detailed in the sections
that follow. All interrupt signaling is provided through the seven multifunction terminals, MFUNC0MFUNC6.
3.8.1
PC Card Functional and Card Status Change Interrupts
PC Card functional interrupts are defined as requests from a PC Card application for interrupt service and are
indicated by asserting specially-defined signals on the PC Card interface. Functional interrupts are generated by
16-bit I/O PC Cards and by CardBus PC Cards.
Card status change (CSC)-type interrupts are defined as events at the PC Card interface that are detected by the
PCI7610 controller and may warrant notification of host card and socket services software for service. CSC events
include both card insertion and removal from PC Card sockets, as well as transitions of certain PC Card signals.
Table 312 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 four 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 312. 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
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/
Smart Card
adapters
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
Power cycle complete
Card insertion or removal
Socket mask bit 3
Socket mask bits 2 and 1
Socket event bit 3
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.
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