SST48CF016 datasheet(33/60 Pages) SST

33 / 60 page

Data Sheet

CompactFlash Card

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

S71125-03-000

9/01

375

3.1.4 True IDE Mode Addressing

When the CompactFlash Card is configured in the True IDE Mode, the I/O decoding is as follows:

3.1.5 CF-ATA Registers

The following section describes the hardware registers used by the host software to issue commands to the Com-

pactFlash device. These registers are often collectively referred to as the “task file.”

Note: In accordance with the PCMCIA specification: each of the registers below which is located at an odd offset

address may be accessed at its normal address and also the corresponding even address (normal address

-1) using data bus lines (D15-D8) when -CE1 is high and -CE2 is low unless -IOIS16 is high (not asserted)

and an I/O cycle is being performed.

3.1.5.1 Data Register (Address - 1F0H[170H];Offset 0,8,9)

The Data Register is a 16 bit register, and it is used to transfer data blocks between the CompactFlash card data

buffer and the Host. This register overlaps the Error Register. The table below describes the combinations of data

rather than to attempt to define general PCMCIA word and byte access modes and operations. See the PCMCIA

PC Card Standard Release 2.0 for definitions of the Card Accessing Modes for I/O and Memory cycles.

Note: Because of the overlapped registers, access to the 1F1H, 171H or offset 1 are not defined for word (-CE2=0

and -CE1=0) operations. These accesses are treated as accesses to the Word Data Register. The dupli-

cated registers at offsets 8, 9 and DH have no restrictions on the operations that can be performed by the

socket.

TABLE

3-5: TRUE IDE MODE I/O DECODING

-CE2

-CE1

-IORD=0

-IOWR=0

RD Data

WR Data

Error Register

Features

Sector Count

Sector No.

Cylinder Low

Cylinder High

Select Card/Head

Status

Command

Alt Status

Device Control

Drive Address

Reserved

T3-5.0 375

Data Register

CE2-

CE1-

Offset

Data Bus

Word Data Register

0,8,9

D15-D0

Even Data Register

0,8

D7-D0

Odd Data Register

D7-D0

Odd Data Register

8,9

D15-D8

Error / Feature Register

1, DH

D7-D0

Error / Feature Register

D15-D8

Error / Feature Register

D15-D8

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