AM53CF96 datasheet(25/76 Pages) AMD

25 / 76 page

P R E L I M I N A R Y

AMD

Am53CF94/Am53CF96

Target Select without ATN Steps

Internal State

Interrupt Status

Explanation

Bits 2:0 (Hex)

Bits 7:0 (Hex)

Selected; received entire CDB; check group code valid bit

Sequence halted in command phase due to parity error; some CDB bytes may

not have been received; check FIFO flags; Initiator asserted

ATN in command

phase

Selected; received entire CDB; check group code valid bit

Sequence halted in command phase because of parity error; some CDB bytes

may not have been received; check FIFO flags

Selected; loaded bus ID into FIFO; null-byte message loaded into FIFO

Target Select with ATN Steps, SCSI-2 Bit NOT SET

Internal State

Interrupt Status

Explanation

Bits 2:0 (Hex)

Bits 7:0 (Hex)

Selection complete; received one message byte and entire CDB; Initiator as-

serted

ATN during command phase

Halted in command phase; parity error and

ATN true

Selected with

ATN; stored bus ID and one message byte; sequence halted be-

cause

ATN remained true after first message byte

Selection completed; received one message byte and the entire CDB

Sequence halted in command phase because of parity error; some CDB bytes

not received; check group code valid bit and FIFO flags

Selected with

ATN; stored bus ID and one message byte; sequence halted be-

cause of parity error or invalid ID message

Target Select with ATN Steps, SCSI-2 Bit SET

Internal State

Interrupt Status

Explanation

Bits 2:0 (Hex)

Bits 7:0 (Hex)

Selection completed; received three message bytes and entire CDB.

ATN is true

Halted in command phase; parity error and

ATN true

412

ATN remained true after third message byte

Selection completed; Initiator deasserts

ATN after receipt of one message byte;

entire CDB received.

ATN asserted during command phase

Sequence halted during command phase because of parity error; one message

byte received; some bytes of CDB not received; parity error and

ATN true

Selected with

ATN; stored bus ID and one message byte; sequence halted be-

cause of parity error or invalid ID message;

ATN is true

Selection completed; received three message bytes and the entire CDB

Received three message bytes then halted in command phase because of parity

error; some CDB bytes not received; check group code valid bit and FIFO flags

Parity error during second or third message byte

Selection completed; Initiator deasserts

ATN after receipt of one message byte;

entire CDB received

Sequence halted during command phase because of parity error; one message

byte received; some bytes of CDB not received; check FIFO flags and group

code valid bit

Selected with

ATN; stored bus ID and one message byte; sequence halted be-

cause of parity error or invalid ID message

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