5-38
SCSI SCRIPTS Instruction Set
excluding RAM and ROM. If it does, a PCI read/write cycle occurs (the
data does not actually transfer to/from the chip), and the chip issues an
interrupt (Illegal Instruction Detected) immediately following.
The SIOM and DIOM bits in the
register determine
whether the destination or source address of the instruction is in Memory
space or I/O space, as illustrated in the following table. The Load/Store
utilizes the PCI commands for I/O read and I/O write to access the I/O
space.
5.7.1 First Dword
This section describes the first Dword of the Load and Store Instruction
register.
Figure 5.15 Load and Store Instruction - First Dword
IT[2:0]
Instruction Type
[31:29]
These bits should be 0b111, indicating the Load and
Store instruction.
Bits A1, A0
Number of Bytes Allowed to Load/Store
00
One, two, three or four
01
One, two, or three
10
One or two
11
One
Bit
Source
Destination
SIOM (Load)
Memory
Register
DIOM (Store)
Register
Memory
31
29
28
27 26 25 24 23
16 15
3
2
0
DCMD Register
DBC Register
IT[2:0]
DSA
R
NF LS
A[7:0]
R
BC
1
1
1
x
0
0
x
x
x
x
x
x
x
x
x
x
0
0
0
0
0
0
0
0
0
0
0
0
0
x
x
x
Содержание LSI53C1000
Страница 6: ...vi Preface...
Страница 16: ...xvi Contents...
Страница 28: ...1 12 Introduction...
Страница 234: ...4 124 Registers...
Страница 314: ...6 40 Specifications This page intentionally left blank...
Страница 318: ...6 44 Specifications This page intentionally left blank...
Страница 344: ...6 70 Specifications This page intentionally left blank...
Страница 350: ...6 76 Specifications Figure 6 42 LSI53C1000 329 Ball Grid Array Bottom view...
Страница 352: ...6 78 Specifications...
Страница 360: ...A 8 Register Summary...
Страница 376: ...IX 12 Index...