Table 3.1 pci bus commands and encoding types, Pci bus commands and encoding types, Table 3.1 – Avago Technologies LSI8751D User Manual
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PCI Addressing
3-3
3.1.1.1 I/O Read Command
The I/O Read command reads data from an agent mapped in I/O
address space. All 32 address bits are decoded.
3.1.1.2 I/O Write Command
The I/O Write command writes data to an agent when mapped in I/O
address space. All 32 address bits are decoded.
Table 3.1
PCI Bus Commands and Encoding Types
C_BE[3:0] Command Type
Supported as Master Supported as Slave
0000
Special Interrupt Acknowledge
No
No
0001
Special Cycle
No
No
0010
I/O Read Cycle
Yes
Yes
0011
I/O Write Cycle
Yes
Yes
0100
Reserved
N/A
N/A
0101
Reserved
N/A
N/A
0110
Memory Read
Yes
Yes
0111
Memory Write
Yes
Yes
1000
Reserved
N/A
N/A
1001
Reserved
N/A
N/A
1010
Configuration Read
No
Yes
1011
Configuration Write
No
Yes
1100
Memory Read Multiple
Yes
1
No (defaults to 0110)
1101
Dual Address Cycle
No
No
1110
Memory Read Line
Yes
2
No (defaults to 0110)
1111
Memory Write and Invalidate
Yes
3
No (defaults to 0111)
1. This operation is selectable by bit 2 in the
operating register.
2. This operation is selectable by bit 3 in the
operating register.
3. This operation is selectable by bit 0 in the
operating register.