LSI53C825AJ LSI, LSI53C825AJ Datasheet - Page 218
LSI53C825AJ
Manufacturer Part Number
LSI53C825AJ
Description
Manufacturer
LSI
Datasheet
1.LSI53C825AJ.pdf
(306 pages)
Specifications of LSI53C825AJ
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CT
SCSI SCRIPTS Instruction Set
Jump/Call an Absolute Address
Start execution at the new absolute address.
Jump/Call a Relative Address
Start execution at the current address plus (or minus) the
relative offset.
The SCRIPTS program counter is a 32-bit value pointing
to the SCRIPTS currently under execution by the
LSI53C825A. The next address is formed by adding the
32-bit program counter to the 24-bit signed value of the
last 24 bits of the Jump or Call instruction. Because it is
signed (2’s complement), the jump can be forward or
backward.
A relative transfer can be to any address within a
16 Mbyte segment. The program counter is combined
with the 24-bit signed offset (using addition or
subtraction) to form the new execution address.
SCRIPTS programs may contain a mixture of direct
jumps and relative jumps to provide maximum versatility
when writing SCRIPTS. For example, major sections of
code can be accessed with far calls using the 32-bit
physical address, then local labels can be called using
relative transfers. If a SCRIPT is written using only
relative transfers it does not require any run time
alteration of physical addresses, and can be stored in and
executed from a PROM.
Carry Test
When this bit is set, decisions based on the ALU carry bit
can be made. True/False comparisons are legal, but Data
Compare and Phase Compare are illegal.
Command
Command
Don’t Care
Absolute Alternate Address
Alternate Jump Offset
Condition Codes
Condition Codes
21
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