LSI53C875 LSI Logic, LSI53C875 Datasheet - Page 223

• Manufacturer Part Number: LSI53C875
• Description: PCI to Ultra SCSI I/O Processor
• Manufacturer: LSI Logic

Transfer Control Instructions
Call Instruction
The LSI53C875 can do a true/false comparison of the
ALU carry bit, or compare the phase and/or data as
defined by the Phase Compare, Data Compare, and
True/False bit fields.
If the comparisons are true, it loads the
Pointer (DSP)
SCRIPTS Pointer Save (DSPS)
value becomes the address of the next instruction.
When the LSI53C875 executes a Call instruction, the
instruction pointer contained in the
Pointer (DSP)
Since the
can only hold one longword, nested call instructions are
not allowed.
If the comparisons are false, the LSI53C875 fetches the
next instruction from the address pointed to by the
SCRIPTS Pointer (DSP)
pointer is not modified.
Figure 6.5
Temporary (TEMP)
illustrates the Transfer Control instruction.
register with the contents of the
register is stored in the TEMP register.
register and the instruction
register is not a stack and
register and that address
DMA SCRIPTS
DMA SCRIPTS
DMA
DMA
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