SST48CF016 datasheet(24/60 Pages) SST

24 / 60 page

Data Sheet

CompactFlash Card

SST48CF008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192 / 256

S71125-03-000

9/01

375

2.4.1 Attribute Memory Function

Attribute memory is a space where CompactFlash card identification and configuration information are stored, and

is limited to 8-bit wide accesses only at even addresses. The card configuration registers are also located here.

For the Attribute Memory Read function, signals -REG and -OE must be active and -WE inactive during the cycle.

As in the Main Memory Read functions, the signals -CE1 and -CE2 control the Even Byte and Odd Byte address,

but only the Even Byte data is valid during the Attribute Memory access. Refer to Table 2-13 below for signal states

and bus validity for the Attribute Memory function.

Note: The -CE signal or both the -OE signal and the -WE signal must be de-asserted between consecutive cycle operations.

2.4.2 Configuration Option Register (Address 200H in Attribute Memory)

The Configuration Option Register is used to configure the cards interface, address decoding and interrupt and to

issue a soft reset to the CompactFlash card.

SRESET

Soft Reset - Setting this bit to one (1), waiting the minimum reset width time and

returning to zero (0) places the CompactFlash card in the Reset state. Setting this bit to

one (1) is equivalent to assertion of the +RESET signal except that the SRESET bit is

not cleared. Returning this bit to zero (0) leaves the CompactFlash card in the same un-

configured Reset state as following power-up and hardware reset. This bit is set to zero

(0) by power-up and hardware reset. Using the PCMCIA Soft Reset is considered a hard

Reset by the ATA Commands. Contrast with Soft Reset in the Device Control Register.

LevlREQ

This bit is set to one (1) when Level Mode Interrupt is selected, and zero (0) when Pulse

Mode is selected. Set to zero (0) by Reset.

Conf5

Conf0 Configuration Index. Set to zero (0) by reset. It’s used to select operation mode of

the CompactFlash card as shown below.

Note: Conf5 and Conf4 are reserved and must be written as (0).

TABLE

2-13: ATTRIBUTE MEMORY FUNCTION

Function Mode

-REG

-CE2

-CE1

A10

-OE

-WE

D15-D8

D7-D0

Standby Mode

VIH

High Z

Read Byte Access CIS ROM (8 bits)

VIL

VIH

VIL

VIH

High Z

Even Byte

Write Byte Access CIS (8 bits) (Invalid)

VIL

VIH

VIL

VIH

VIL

Don’t Care

Even Byte

Read Byte Access Configuration (8 bits)

VIL

VIH

VIL

VIH

VIL

VIH

High Z

Even Byte

Write Byte Access Configuration (8 bits)

VIL

VIH

VIL

VIH

VIL

VIH

VIL

Don’t Care

Even Byte

Read Word Access CIS (16 bits)

VIL

XVIL

VIH

Not Valid

Even Byte

Write Word Access CIS (16 bits) (Invalid)

VIL

XVIH

VIL

Don’t Care

Even Byte

Read Word Access Configuration (16 bits)

VIL

VIH

XVIL

VIH

Not Valid

Even Byte

Write Word Access Configuration (16 bits)

VIL

VIH

XVIH

VIL

Don’t Care

Even Byte

T2-13.0 375

Operation

D7D6

D5D4D3D2

D1D0

R/W

SRESET

LevlREQ

Conf5

Conf4

Conf3

Conf2

Conf1

Conf0

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