LSI53C825AJ LSI, LSI53C825AJ Datasheet - Page 190

• Manufacturer Part Number: LSI53C825AJ
• Manufacturer: LSI

Specifications of LSI53C825AJ

• Lead Free Status / RoHS Status: Not Compliant

5.3 Block Move Instructions
5.3.1 First Dword
5-6
Performing a Block Move instruction, bit 5, Source I/O - Memory Enable
(SIOM) and bit 4, Destination I/O - Memory Enable (DIOM) in the
Mode (DMODE)
address resides in memory or I/O space. When data is being moved onto
the SCSI bus, SIOM controls whether that data comes from I/O or
memory space. When data is being moved off of the SCSI bus, DIOM
controls whether that data goes to I/O or memory space.
IT[1:0]
IA
SCSI SCRIPTS Instruction Set
Instruction Type - Block Move
Indirect Addressing
When this bit is cleared, user data is moved to or from
the 32-bit data start address for the Block Move
instruction. The value is loaded into the chip’s address
register and incremented as data is transferred. The
address of the data to move is in the second Dword of
this instruction.
When this bit is one, the 32-bit user data start address
for the Block Move is the address of a pointer to the
actual data buffer address. The value at the 32-bit start
address is loaded into the chip’s
(DNAD)
transfer across the host computer bus).
Direct Addressing
The byte count and absolute address are:
Indirect Addressing
Use the fetched byte count, but fetch the data address
from the address in the instruction.
register determines whether the source/destination
Command
Command
register using a third longword fetch (4-byte
Address of Pointer to Data
Address of Data
Byte Count
Byte Count
DMA Next Address
[31:30]
DMA
29