PCI7510 datasheet(59/234 Pages) TI

59 / 234 page

3–19

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

PCI7510 device. The PCI7510 device provides several interrupt signaling schemes to accommodate the needs of

a variety of platforms. The different mechanisms for dealing with interrupts in this device 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

PCI7510 device is, therefore, backward compatible with existing interrupt control register definitions, and new

registers have been defined where required.

The PCI7510 device 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 PCI7510 device, PC

Card interrupts are classified either as card status change (CSC) or as functional interrupts.

The method by which any type of PCI7510 interrupt is communicated to the host interrupt controller varies from

system to system. The PCI7510 device 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, MFUNC0–MFUNC6.

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

PCI7510 device 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 3–12 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

•

Smart Card

Table 3–12. 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.

PCI7510 Datasheet(PDF) 59 Page - Texas Instruments

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