5-18
SCSI SCRIPTS Instruction Set
If the CPU sets the SIGP bit in the
register, the LSI53C1000 aborts the Wait
Reselect instruction and fetches the next instruction from
the address pointed to by the 32-bit jump address field
stored in the
register.
Set Instruction
When the SACK/ or SATN/ bits are set, the
corresponding bits in the
register are set. When the target bit is set, the
corresponding bit in the
register is also set. When the carry bit is set, the
corresponding bit in the ALU is set.
Clear Instruction
When the SACK/ or SATN/ bits are cleared, the
corresponding bits are cleared in the
register. When the target bit is
cleared, the corresponding bit in the
register is cleared. When the carry bit is
cleared, the corresponding bit in the ALU is cleared.
RA
Relative Addressing Mode
26
When this bit is set, the 24-bit signed value in the
register is used as a relative
displacement from the current
address. Use this bit only in conjunction with the
Select, Reselect, Wait Select, and Wait Reselect
instructions. The Select and Reselect instructions can
contain an absolute alternate jump address or a relative
transfer address.
TI
Table Indirect Mode
25
When this bit is set, the 24-bit signed value in the
register is added to the value in the
register, and used as an
offset relative to the value in the Data Structure Address
(DSA) register. The
value,
SCSI ID, synchronous offset and synchronous period are
loaded from this address. Prior to the start of an I/O, load
the
with the base address
of the I/O data structure. Any address on a Dword
boundary is allowed. After a Table Indirect opcode is
fetched, the
is added to
the 24-bit signed offset value from the opcode to
Содержание LSI53C1000
Страница 6: ...vi Preface...
Страница 16: ...xvi Contents...
Страница 28: ...1 12 Introduction...
Страница 234: ...4 124 Registers...
Страница 314: ...6 40 Specifications This page intentionally left blank...
Страница 318: ...6 44 Specifications This page intentionally left blank...
Страница 344: ...6 70 Specifications This page intentionally left blank...
Страница 350: ...6 76 Specifications Figure 6 42 LSI53C1000 329 Ball Grid Array Bottom view...
Страница 352: ...6 78 Specifications...
Страница 360: ...A 8 Register Summary...
Страница 376: ...IX 12 Index...