LSI LSI53C896, Technical Manual

Page: 261 / 370

Transfer Control Instructions 5-33
DC Data Compare Value [7:0]
This 8-bit field is the data compared against the SCSI
First Byte Received (SFBR) register. These bits are used
in conjunction with the Data Compare Mask Field to test
for a particular data value. If the COM bit (
DMA Control
(DCNTL) , bit 0) is cleared, the value in the SFBR register
may not be stable. In this case, do not use instructions
using this data compare value.
5.5.2 Second Dword
Figure 5.10 Transfer Control Instructions - Second Dword
Jump Address [31:0]
This 32-bit field contains the address of the next
instruction to fetch when a jump is taken. Once the
LSI53C896 fetches the instruction from the address
pointed to by these 32 bits, this address is incremented
by 4, loaded into the
DMA SCRIPTS Pointer (DSP)
register and becomes the current instruction pointer.
5.5.3 Third Dword
Figure 5.11 Transfer Control Instructions - Third Dword
JUMP64 Address [31:0]
This 32-bit field contains the upper Dword of a 64-bit
address of the next instruction to fetch when a JUMP64
is taken.
31 0
DSPS Register
31 0
SFS Register (Used for JUMP64 Instruction)
*