Avago Technologies LSI53C876E User Manual
Page 208
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SCSI SCRIPTS Instruction Set
Wait Reselect Instruction
If the LSI53C876 is selected before being reselected, it
fetches the next instruction from the address pointed to
by the 32-bit jump address field stored in the
register. Manually set the LSI53C876 to
Target mode when it is selected.
If the LSI53C876 is reselected, it fetches the next
instruction from the address pointed to by the
register.
If the CPU sets the SIGP bit in the
register, the LSI53C876 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 cleared, 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