Scsi Control Commands; Control Commands And Command Codes; Description Of Each Control Command - Epson S1R72105 Technical Manual

S1R72105 Technical Manual

7.6 SCSI Control Commands

7.6.1 Control Commands and Command Codes

Code
00h
01h Abort_SCSI
02h
03h
04h Assert_RST
05h Busfree
06h
07h
Assert_ATN
08h SEL_MSG_clear
09h Select_WithoutATN
0Ah
Select_WithATN_Commannd
0Bh SelectWithoutATN_Command
0Ch
Wait_Selection_Command
0Dh
Reselection
0Eh Wait_Reselection
0Fh
Wait_SCAM_Selection_Command
10h
11h Negate_ACK
12h Command_Out
13h DMA_Data_Out
14h Non-DMA_Data_Out
15h DMA_Data_In
16h Non-DMA_Data_In
17h Status_In
18h
Message_In
19h
Message_Out
1Ah
Status_Message

7.6.2 Description of Each Control Command

Abort_SCSI (01H)
Aborts the SCSI control command in process of execution. After aborting the process,
The SABT bit of the MAININT register is set.
The status block is set.
It causes an interruption. If this command is issued in the state of not operating, it is ignored.
Assert_RST (04H)
Asserts the SCSI RST signal (XSRST) for 768 × T × 2 (about 46µs), and then negates it.
This command releases all the signals it asserts, causing the busfree condition. The inside of the IC is not
initialized.
It sets the SCSIINT1 SRST bit after negating the RST signal, causing an interruption.
When the SCSI control command is being executed, it is forced to terminate. Only RST bit is set, though.
When the SCSI DMA command is being executed, the status block is set.
Busfree (05H)
Executes busfree.
The command is valid only in Target mode. If issued in Initiator mode, it is ignored.
It is invalid if issued while other SCSI-type command is in execution, causing a command error and a command
error interruption.
52
Command names Summary of commands
Reserved
SCSI Abort command
Reserved
SCSI Bus Clear command
Reserved
SCAM control commands
Connection system commands
Reserved
Transfer system commands
EPSON Rev.1.0