Avago Technologies LSI8751D - Manual (Page 235)

Load and Store Instructions 6-39
R Reserved 23
RA[6:0] Register Address [22:16]
A[6:0] selects the register to Load and Store to/from
within the LSI53C875.
Note: It is not possible to Load the SCSI First Byte Received
(SFBR) register, although it is possible to store the SFBR
contents to another location.
R Reserved [15:3]
BC Byte Count [2:0]
This value is the number of bytes to Load and Store.
6.7.2 Second Dword
Memory/IO Address/DSA Offset [31:0]
This is the actual memory location of where to Load and
Store, or the offset from the
Data Structure Address
(DSA) register value.
Figure 6.7 illustrates the Load and Store Instruction
format.