PCI1031 datasheet(23/100 Pages) TI

23 / 100 page

PCI1031

PCI-TO-PC CARD16 CONTROLLER UNIT

SCPS008B – FEBRUARY 1996 – REVISED DECEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

functional and CSC interrupts

Functional interrupts are defined as requests from a PC Card 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.

CSC interrupts are defined as events at the PC Card interface that are detected by the PCI1031 and can warrant

notification of host software for service. Such events include transitions on certain PC Card signals or card

removal/insertion. The specific examples of functional and CSC interrupts depend on the type of PC Card(s)

installed in the socket at any given time. The 16-bit interrupt sources differ between memory and I/O PC Cards.

Table 7 summarizes the sources of interrupts and the type of PC Card associated with them. The functional

interrupt events are valid only for 16-bit I/O Cards. Card insertion and removal events are independent of the

card type since the same card-detect signals are used in both cases and the PCI1031 cannot distinguish

between card types upon card insertion.

Table 7. PC Card Interrupt Events and Description

CARD TYPE

EVENT

TYPE

SIGNAL

DESCRIPTION

Battery conditions

CSC

BVD1(STSCHG)

A transition on BVD1 indicates a change in the PC Card

battery conditions.

16-bit memory

(BVD1, BVD2)

CSC

BVD2(SPKR)

A transition on BVD2 indicates a change in the PC Card

battery conditions.

Wait states

(READY)

CSC

READY(IREQ)

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)

The assertion of STSCHG indicates a status change on the

PC Card.

16-bit I/O

Interrupt request

(IREQ)

Functional

READY(IREQ)

The assertion of IREQ 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 // CardBus PC Card.

All PC Cards

Power cycle complete

CSC

N/A

An interrupt is generated when a PC Card power up cycle

is complete.

The signal-naming convention for PC Card signals describes the function for 16-bit memory and I/O cards. The

16-bit memory card signal name is first, with the I/O card signal name second, enclosed in parentheses. The

16-bit I/O cards use two signal lines to signal interrupts: one to indicate a change in card status and another

dedicated to request interrupt servicing from the host. A 16-bit memory PC Card uses the BVD1 and BVD2

signals to indicate changes in battery conditions on the card, and it uses the READY signal to insert wait states

during memory card data transfers.

The PC Card standard describes the power-up sequence that must be followed by the PCI1031 when an

insertion event occurs and the host requests that the socket VCC and VPP be powered. Upon completion of this

power-up sequence, the PCI1031 interrupt scheme can be used to notify the host system denoted by “power

cycle complete” (see Table 7). This interrupt source is considered a PCI1031 internal event because it does not

depend on a signal change at the PC Card interface, but rather the completion of applying power to the socket.

Host software can individually mask (disable) each of the potential CSC interrupt sources listed in Table 7 by

setting the appropriate bits in the PCI1031. By individually masking the interrupt sources listed in Table 7, host

software can control which events cause a PCI1031 interrupt. Host software has some control over which

system interrupt the PCI1031 asserts by programming the appropriate routing registers. The PCI1031 allows

host software to route PC Card CSC and functional interrupts to separate system interrupts. Interrupt routing

is specific to the interrupt signaling method used and is discussed in the following sections.

PCI1031 Datasheet(PDF) 23 Page - Texas Instruments

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