Avago Technologies LSI53C1010 - Manual (Page 265)

Using SCRIPTS for Target Operation 11-15
Figure 11.25 SCRIPTS Source Code–abort Label
The SCRIPTS processor only performs the stopped_busy_wait_select ,
Figure 11.26 , if it is selected while stopped or busy working on another
command. The Request Sense, Test Unit Ready, Inquiry, and Read
Capacity commands are valid while the target device is busy or stopped
and the chip must respond to them. If the chip is stopped, it only
responds to one of these commands or to a Start command.
Figure 11.26 SCRIPTS Source Code–stopped_busy_wait_select Command
stopped_busy_wait_select:
wait select rel(SIGP_set) ;wait to be selected
move from msg_out_buf, with msg_out ;get message byte
call rel(msg_out_phase), if atn ;stay in message if atn still active
move from cmd_buf, with cmd ;get SCSI command
move scntl1 & 0xdf to scntl1 ;turns on the halt on parity error or atn
jump rel(stopped_busy_tur), if 0x00 ;jump to test unit ready
int request_sense_command, if 0x03 ;interrupt to set up request sense command
int inquiry_command, if 0x12 ;interrupt to set up inquiry command
int read_capacity_command, if 0x25 ;interrupt to set up read capacity command
move sfbr to scratcha3 ;save the first byte of the command
move scratcha1 to sfbr ;get the busy flag
jump rel(stopped_busy_tur), if 0x01 ;if busy, go right to status and message
move scratcha3 to sfbr ;restore the first byte of the command
int start_stop_command, if 0x1b ;interrupt to set up start/stop unit command
jump rel(stopped_busy_tur) ;go to status and message for any other
;command
alt_got_selected:
int got_selected ;interrupt because got selected during
;reselect attempt
SIGP_set:
int got_SIGP ;taking interrupt because got SIGP
copy_data:
move memory count, source_address, destination_address
;memory move to write SCRIPTS RAM and to
;transfer data to and from upper memory
int done_with_copy ;signal completion of memory move
abort:
move 0x20 to scntl1 ;turns off the halt on parity error or atn
disconnect ;go to bus free
int command_aborted ;int to notify driver that command was aborted