SST48CF016 datasheet(30/60 Pages) SST

30 / 60 page

Data Sheet

CompactFlash Card

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

S71125-03-000

9/01

375

3.0 SOFTWARE INTERFACE

3.1 CF-ATA Drive Register Set Definition and Protocol

The CompactFlash card can be configured as a high performance I/O device through:

1. Standard PC-AT disk I/O address spaces 1F0H-1F7H, 3F6H-3F7H (primary);

170H-177H, 376H-377H (secondary) with IRQ 14 (or other available IRQ).

2. Any system decoded 16 Byte I/O block using any available IRQ.

3. Memory space.

The communication to or from the CompactFlash card is done using the Task File registers which provide all the

necessary registers for control and status information. The PCMCIA interface connects peripherals to the host

using four register mapping methods. The following is a detailed description of these methods:

3.1.1 I/O Primary and Secondary Address Configurations

Note: Address lines which are not indicated are ignored by the CompactFlash card for accessing all the registers in this table.

TABLE

3-1: I/O CONFIGURATIONS

Standard Configurations

Config Index

I/O or Memory

Address

Description

Memory

0H-FH, 400H-7FFH

Memory Mapped

I/O

XX0H-XXFH

I/O Mapped 16 Contiguous Registers

I/O

1F0H-1F7H, 3F6H-3F7H

Primary I/O Mapped

I/O

170H-177H, 376H-377H

Secondary I/O Mapped

T3-1.0 375

TABLE

3-2: PRIMARY AND SECONDARY I/O DECODING

-REG

A9-A4

-IORD=0

-IOWR=0

Note

1F(17)

Even RD Data

Even WR Data

1,2

1. Register 0 is accessed with -CE1 low and -CE2 low (and A0 = Don’t Care) as a word register on the combined Odd Data Bus and

Even Data Bus (D15-D0). This register may also be accessed by a pair of byte accesses to the offset 0 with -CE1 low and -CE2 high.

Note that the address space of this word register overlaps the address space of the Error and Feature byte-wide registers which lie at

offset 1. When accessed twice as byte register with -CE1 low, the first byte to be accessed is the Even Byte of the word and the sec-

ond byte accessed is the Odd Byte of the equivalent word access.

2. A byte access to register 0 with -CE1 high and -CE2 low accesses the error (read) or feature (write) register.

1F(17)H

Error Register

Features

1,2

1F(17)H

Sector Count

1F(17)H

Sector No.

1F(17)H

Cylinder Low

1F(17)H

Cylinder High

1F(17)H

Select Card/Head

1F(17)H

Status

Command

3F(37)H

Alt Status

Device Control

3F(37)H

Drive Address

Reserved

T3-2.1 375

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