Figure3.6 int format, Table 3.6 scsi phase bit values (int format), Int format – Avago Technologies LSI53C1010 User Manual
Page 58: Scsi phase bit values (int format)
3-18
The SCSI SCRIPTS Processor Instruction Set
Example
INT 0x00000001, WHEN NOT COMMAND
INT 0x200010F7, IF 0xF8 AND MASK 0x07
The values in
define the SCSI information transfer phase. The
LSI53C10XX chips, with dual transition timing capabilities define two
transfer phases, ST for single transition timing, and DT for dual transition
timing.
MASK
Represents an 8-bit value that is stored in the mask field of the
instruction. Any bit that is set in the mask causes the
corresponding bit in the data byte to be ignored at the time of the
comparison.
CARRY
Indicates that an interrupt should take place based on the value
of the carry bit in the ALU. Carry comparisons cannot take place
at the same time as data and phase comparisons.
Figure 3.6
INT Format
31
30
29
27 26
24 23 22
21
20
19
18
17
16 15
8 7
0
DCMD Register
DBC Register
Instr Type
Opcode
SCSI
Phase
R
Carry
Test
R True
Comp
Data
Comp
Phase
Wait
Mask
Data
1
0
0 1
1 x x x
0
0
0
0
x
x
x
x
x
x x x x x x x x x x x x x x x
31
0
DSPS Register
int_value
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Table 3.6
SCSI Phase Bit Values (INT Format)
1
Phase
Message
Command/Data
Input/Output
DATA_OUT
2
(ST_DATA_OUT)
3
0
0
0
DATA_IN
2
(ST_DATA_IN)
3
0
0
1