LSI LSI53C896, Technical Manual

Page: 242 / 370

5-14 SCSI SCRIPTS Instruction Set
5.2.2 Second Dword
Figure 5.3 Block Move Instruction - Second Dword
Start Address [31:0]
This 32-bit field specifies the starting address of the data
to move to/from memory. This field is copied to the
DMA
Next Address (DNAD) register. When the LSI53C896
transfers data to or from memory, the DNAD register is
incremented by the number of bytes transferred.
When bit 29 is set, indicating indirect addressing, this
address is a pointer to an address in memory that points
to the data location. When bit 28 is set, indicating table
indirect addressing, the value in this field is an offset into
a table pointed to by the
Data Structure Address (DSA) .
The table entry contains byte count and address
information.
5.2.3 Third Dword
Figure 5.4 Block Move Instruction - Third Dword
Start Address [63:32]
This 32-bit field specifies the upper Dword of a 64-bit
starting address of data to move to/from memory. This
field is copied to the
Dynamic Block Move Selector
(DBMS) register. The EN64DBMV bit in the Chip
Control 1 (CCNTL1) register must be set for this Dword
to be fetched.
31 0
DSPS Register
31 0
DBMS Register
*