AM53CF94KC datasheet(37/76 Pages) AMD

37 / 76 page

P R E L I M I N A R Y

AMD

Am53CF94/Am53CF96

COMMANDS

The device commands can be broadly divided into two

categories, DMA commands and non-DMA commands.

DMA commands are those which cause data movement

between the host memory and the SCSI bus while non-

DMA commands are those that cause data movement

between the device FIFO and the SCSI bus. The MSB of

the command byte differentiate the DMA from the non-

DMA commands.

Summary of Commands

Non-

DMA

Mode

Initiator Commands

Information Transfer

Initiator Command Complete Steps

Message Accepted

–

Transfer Pad Bytes

Set

ATN

–

Reset

ATN

–

Target Commands

Send Message

Send Status

Send Data

Disconnect Steps

Terminate Steps

Target Command Complete Steps

Disconnect

Receive Message

Receive Command Steps

Receive Data

Receive Command Steps

DMA Stop Command

Access FIFO Command

Non-

DMA

Mode

Idle State Commands

Reselect Steps

Select without

ATN Steps

Select with

ATN Steps

Select with

ATN and Stop Steps

Enable Selection/Reselection

Disable Selection/Reselection

Select With

ATN3 Steps

Reselect with

ATN3 Steps

General Commands

No Operation

Clear FIFO

Reset Device

Reset SCSI bus

Command Code

(Hex.)

Command Code

(Hex.)

Command

AM53CF94KC Datasheet(PDF) 37 Page - Advanced Micro Devices

AM53CF94KC Datasheet(HTML) 37 Page - Advanced Micro Devices

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