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N/B Maintenance
N/B Maintenance
5.5 PCI1410GGU PCMCIA Controller
CardBua PC Card Interface Control (Slots A and B) (Continued)
Name I/O Description
CPERR#
I/O CardBus parity error. CPERR# reports parity errors during CardBus
transactions, except during special cycles. It is driven low by a target two
clocks following that data when a parity error is detected.
CREQ#
I CardBus request. CREQ# indicates to the arbiter that the CardBus PC Card
desires use of the CardBus bus as an initiator.
CSERR#
I CardBus system error. CSERR# reports address parity errors and other
system errors that could lead to catastrophic results. CSERR# is driven by
the card synchronous to CCLK, but deasserted by a weak pullup, and may
take several CCLK periods. The PCI1410 can report CSERR# to the system
by assertion of SERR# on the PCI interface.
CSTOP#
I/O CardBus stop. CSTOP# is driven by a CardBus target to request the initiator
to stop the current CardBus transaction. CSTOP# is used for target
disconnects, and is commonly asserted by target devices that do not support
burst data transfers.
CSTSCHG
I CardBus status change. CSTSCHG alerts the system to a change in the
card’s status, and is used as a wake-up mechanism.
CTRDY#
I/O CardBus target ready. CTRDY# indicates the CardBus target’s ability to
complete the current data phase of the transaction. A data phase is
completed on a rising edge of CCLK, when both CIRDY# and CTRDY#
are asserted; until this time, wait states are inserted.
CVS1
CVS2
I/O CardBus voltage sense 1 and CardBus voltage sense 2. CVS1 and CVS2 are
used in conjunction with CCD1# and CCD2# to identify card insertion and
interrogate cards to determine the operating voltage and card type.
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