Avago Technologies LSI53C1010 - Manual (Page 242)

10-6 Multithreaded I/O
Figure 10.4 Multithreaded SCRIPTS Example Step 2
Table0 has the nexus information about any previously negotiated
synchronous transfer period and offset. It also contains the SCSI ID
of the target device. Clock divider information for the SCNTL3
register is also included in this table. The operating system builds the
command and other buffer information into this table prior to starting
this I/O.
3. The SCRIPTS instruction moves the address of the IO_requestX into
the schedule_nop SCRIPTS destination address field.
This allows the multithreaded SCRIPT instruction to write a NOP into
the io_requestX location in the scheduler to indicate that the I/O has
started. See
Figure 10.5 .
Host Memory
0
0
0 cmd_byte_count
command_address
SCNTL3 device id synch period
DSA
table0:
table0_ptr
Host Memory
;Scheduler SCRIPT code
scheduler:
SCRIPTS Processor
entry0:
MOVE MEMORY 4, PATCH_addr_of_table0_ptr, PATCH_chip_physaddr+DSA