Avago Technologies LSI53C1010 - Manual (Page 262)

11-12 Using the SCRIPTS Processor in Target Applications
Figure 11.17 SCRIPTS Source Code–Read Label
The read_disconnect label, Figure 11.18 disconnects the device from
the bus and sets the Semaphore bit, which tells the interrupt service
routine it is disconnected.
Figure 11.18 SCRIPTS Source Code–read_disconnect Label
The read_reconnect label, Figure 11.19 , performs reselection, moves
the identify message from the message in buffer, and jumps to send the
data.
read:
move scratchb0 to sfbr ;get identify message
jump rel(read_disconnect) if 0x40 and mask 0xbf;jump disconnect if
;disconnects are allowed
int read_access_medium ;interrupt to read data from
; medium
read_return:
move from data_buf, with data_in ;move the data out from the buffer
move scratchb1 to sfbr ;get the 'finished' flag
jump rel(tur) if 0x00 ;jump to status and message
;if transfer done
move scratchb0 to sfbr ;get identify message
jump rel(read_disconnect) if 0x40 and mask 0xbf
;jump to disconnect if disconnects
;are allowed
move from save_pointers, with msg_in ;move out the save pointers
;message
call rel(msg_out_phase) if atn ;jump to message out if atn active
int read_access_medium ;interrupt to access medium
read_disconnect:
move from disconnect_msg, with msg_in ;move out the disconnect message
call rel(msg_out_phase) if atn ;jump to message out if atn active
move 0x20 to scntl1 ;turns off the halt on parity
;error or atn
disconnect ;disconnect from the bus
move 0x10 to istat ;set the semaphore bit to say we
;are disconnected
int read_access_medium ;interrupt to read data from medium