SST58SD024 datasheet(14/40 Pages) SST

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Data Sheet

ATA-Disk Chip

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S71167-05-000

9/01

391

2.4 I/O Transfer Function

2.4.1 I/O Function

ADC permits 8-bit data access if the user issues a Set Feature Command to enable 8-bit Mode.

The following table defines the function of various operations.

TABLE

2-8: I/O FUNCTION

Function Code

CS3FX#

CS1FX#

A0-A2

IORD#

IOWR#

D15-D8

D7-D0

Invalid Mode

VIL

1. X can be VIL or VIH, but no other value.

Undefined

Standby Mode

VIH

High Z

Task File Write

VIH

VIL

1-7H

VIH

VIL

XData In

Task File Read

VIH

VIL

1-7H

VIL

VIH

High Z

Data Out

Data Register Write

VIH

VIL

0VIH

VIL

In2

2. If 8-bit data transfer mode is enabled.

In 8-bit data transfer mode, High Byte is undefined for Data Out; can be VIL or VIH, but no other value, for Data In.

Data Register Read

VIH

VIL

0VIL

VIH

Out2

Out

Control Register Write

VIL

VIH

VIL

Control In

Alt Status Read

VIL

VIH

VIL

VIH

High Z

Status Out

Drive Address

VIL

VIH

VIL

VIH

High Z

Data Out

T2-8.1 391

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