AM53C96KC datasheet(22/63 Pages) AMD

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P R E L I M I N A R Y

AMD

Am53C94/Am53C96

SCSI Timeout Register (05H) Write

SCSI Timeout Register

STIMREG

Address: 05H

Type: Write

76543

210

STIM7

STIM6

STIM5

STIM4

STIM3

STIM2

STIM1

STIM0

xxxxx

xxx

16506C-23

This register determines how long the initiator (target)

will wait for a target to respond to a selection (reselec-

tion) before timing out. It should be set to yield 250 ms to

comply with ANSI standards for SCSI.

STIMREG – Bits 7:0 – STIM 7:0 – SCSI Timer 7:0

The value loaded in STIM 7:0 can be calculated from the

following formula:

STIM 7:0 =

[(SCSI Time Out) (Clock Frequency) / (8192 (Clock

Factor))]

Example:

SCSI Time Out (in seconds): 250 ms. (Recommended

by the ANSI Standard) = 250 x 10–3 s.

Clock Frequency: 20 MHz. (assume) = 20 x 106 Hz.

Clock Factor: CLKF 2:0 from Clock Conversion Regis-

ter (09H) = 5

STIM 7:0 = (250 x 10–3) X (20 x 106) / (8192 (5)) = 122

decimal

Internal State Register (06H) Read

Internal State Register

ISREG

Address: 06H

Type: Read

76543

210

RES

SOF

IS2

IS1

IS0

xxxx

Reserved

Synchronous Offset Flag

Internal State 2:0

Reserved

16506C-24

The Internal State Register (ISREG) tracks the progress

of a sequence-type command. It is updated after each

successful completion of an intermediate operation. If

an error occurs, the host can read this register to deter-

mined at where the command failed and take the neces-

sary procedure for recovery. Reading the Interrupt

Status Register will clear this register.

ISREG – Bits 7:4 – RES – Reserved

ISREG – Bit 3 – SOF – Synchronous Offset Flag

The SOF is reset when the Synchronous Offset Register

(SOFREG) has reached its maximum value.

Note:

The SOF bit is active Low.

ISREG – Bits 2:0 – IS 2:0 – Internal State 2:0

The IS 2:0 bits along with the Interrupt Status Register

(INSTREG) indicates the status of the successfully

completed intermediate operation. Refer to the Status

Decode section for more details.

AM53C96KC Datasheet(PDF) 22 Page - Advanced Micro Devices

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