Table 2−12. CardBus PC Card Interface System Terminals

A 33-to 47-series damping resistor (per PC Card specification) is the only external component needed for terminals B08 (A_CCLK) and H17 (B_CCLK). If any CardBus PC Card interface system terminal is unused, then the terminal may be left floating.

 

SKT A TERMINAL

 

SKT B TERMINAL

 

DESCRIPTION

I/O

INPUT

OUTPUT

PU/

POWER

 

NAME

NO.

 

NAME

NO.

 

TYPE

PD

RAIL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CardBus clock. CCLK provides synchronous timing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for all transactions on the CardBus interface. All

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

signals except CRST, CCLKRUN, CINT, CSTSCHG,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAUDIO, CCD2, CCD1, CVS2, and CVS1 are

 

 

 

 

VCCA/

 

A_CCLK

E09

B_CCLK

H18

sampled on the rising edge of CCLK, and all timing

O

 

PCIO3

 

 

 

 

VCCB

 

 

 

 

 

 

 

 

 

 

parameters are defined with the rising edge of this

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

signal. CCLK operates at the PCI bus clock

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

frequency, but it can be stopped in the low state or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

slowed down for power savings.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CardBus clock run.

 

 

is used by a CardBus

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CCLKRUN

 

 

 

 

 

 

 

 

 

C03

 

 

 

 

A18

PC Card to request an increase in the CCLK

I/O

PCII4

PCIO4

PU3

VCCA/

 

A_CCLKRUN

B_CCLKRUN

 

frequency, and by the controller to indicate that the

VCCB

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CCLK frequency is going to be decreased.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CardBus reset.

 

 

brings CardBus PC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CRST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Card-specific registers, sequencers, and signals to a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

known state. When CRST is asserted, all CardBus

 

 

 

 

VCCA/

 

A_CRST

A06

B_CRST

F17

PC Card signals are placed in a high-impedance

O

PCII4

PCIO4

PU3

 

VCCB

 

 

 

 

 

 

 

 

 

 

state, and the controller drives these signals to a valid

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

logic level. Assertion can be asynchronous to CCLK,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

but deassertion must be synchronous to CCLK.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

These terminals are reserved for the PCI7611 and PCI7411 controllers.

2−22

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Texas Instruments PCI7411, PCI7611, PCI7621, PCI7421 manual 12. CardBus PC Card Interface System Terminals, PCIO3 Vccb