AM53CF94 datasheet(22/76 Pages) AMD

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P R E L I M I N A R Y

AMD

Am53CF94/Am53CF96

Interrupt Status Register (05H) Read

SRST

ICMD

DIS

00000

Interrupt Status Register

INSTREG

Address: 05h

Type: READ

76543

210

RESEL

SELA

SEL

000

Invalid Command

Disconnected

Service Request

Successful Operation

Selected with Attention

SCSI Reset

Selected

Reselected

17348B-22

The Interrupt Status Register (INSTREG) will indicate

the reason for the interrupt. This register is used with the

Status Register (STATREG) and Internal State Register

(ISREG) to determine the reason for the interrupt.

Reading the INSTREG will clear all three registers.

Therefore the Status Register (STATREG) and Internal

State Register (ISREG) should be examined prior to

reading the INSTREG.

INSTREG – Bit 7 – SRST – SCSI Reset

The SRST bit will be set if a SCSI Reset is detected and

SCSI reset reporting is enabled via the DISR (bit 6) of

Control Register One (CNTLREG1).

INSTREG – Bit 6 – ICMD – Invalid Command

The ICMD bit will be set if the device detects an illegal

command code. This bit is also set if a command code is

detected from a mode that is different from the mode the

device is currently in. Once this bit is set, and invalid

command interrupt will be generated.

INSTREG – Bit 5 – DIS – Disconnected

The DIS bit can be set in the Target or the Initiator mode

when the device disconnects from the SCSI bus. In the

Target mode this bit will be set if a Terminate or a Com-

mand Complete steps causes the device to disconnect

from the SCSI bus. In the Initiator mode this bit will be

set if the Target disconnects; while in Idle mode, this bit

will be set if a selection or reselection timeout occurs.

INSTREG – Bit 4 – SR – Service Request

The SR bit can be set in the Target or the Initiator mode

when another device on the SCSI bus has a service

request. In the Target mode this bit will be set when the

Initiator asserts the

ATN signal. In the Initiator mode this

bit is set when a Command Steps Successfully Com-

pleted Command is issued.

INSTREG – Bit 3 – SO – Successful Operation

The SO bit can be set in the Target or the Initiator mode

when an operation has successfully completed. In the

Target mode this bit will be set when any Target or Idle

state command is completed. In the Initiator mode this

bit is set after a Target has been successfully selected,

after a command has successfully completed and after

an information transfer command when the Target

requests a Message In phase.

INSTREG – Bit 2 – RESEL – Reselected

The RESEL bit is set at the end of the reselection phase

indicating that the device has been reselected as an

Initiator.

INSTREG – Bit 1 – SELA – Selected with Attention

The SELA bit is set at the end of the selection phase indi-

cating that the device has been selected as a Target by

the Initiator and that the

ATN signal was active during

the selection.

INSTREG – Bit 0 – SEL – Selected

The SEL bit is set at the end of the selection phase indi-

cating that the device has been selected as a Target by

the Initiator and that the

ATN signal was inactive during

the selection.

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