SMCXXXBF datasheet(20/91 Pages) STMICROELECTRONICS

20 / 91 page

Electrical interface

SMCxxxBF

20/91

READY

(PC Card Memory Mode)

O37

Indicates whether the Card is busy (Low), or ready to

accept a new data transfer operation (High). The Host

socket must provide a pull-up resistor. At power up and

Reset, the READY signal is held Low until the commands

are completed. No access should be made during this time.

The READY signal is held High whenever the Card has

been powered up with RESET continuously disconnected or

asserted.

–IREQ

(PC Card I/O Mode)

Interrupt Request. It is strobed Low to generate a pulse

mode interrupt or held Low for a level mode interrupt.

INTRQ

(True IDE Mode)

Active High Interrupt Request to the host.

–REG

(PC Card Memory Mode)

I44

Used to distinguish between Common Memory and

Memory, Low for Attribute Memory.

–REG

(PC Card I/O Mode)

Must be Low during I/O Cycles when the I/O address is on

the Bus.

–DMACK

(True IDE Mode)

The –DMACK input signal is used to acknowledge DMA

transfers. It is asserted by the host in response to DMARQ

to initiate the transfer.

When DMA mode is disabled,

the Card should ignore the

-DMACK signal.

If the host does not support DMA mode, but only True IDE

mode, this signal should be driven High or tied to VCC by the

host.

RESET

(PC Card Memory Mode)

I41

Resets the Card (active High). The Card is Reset at power

up only if this pin is left High or unconnected.

RESET

(PC Card I/O Mode)

Same as PC Card Memory Mode.

–RESET

(True IDE Mode)

Hardware Reset from the host (active Low).

VCC

(PC Card Memory Mode)

13,38

+5V, +3.3V power.

VCC

(PC Card I/O Mode)

Same for all modes.

VCC

(True IDE Mode)

Same for all modes.

Table 9.

Signal Description (continued)

Signal Name

Dir.

Description

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