Avago Technologies LSI53C1020 - Manual (Page 37)

PCI Functional Description 2-11
Version 2.4 Copyright © 2001–2004 by LSI Logic Corporation. All rights reserved.
2.3.2.2 Special Cycle Command
The LSI53C1020 ignores this command as a slave and never generates
it as a master.
2.3.2.3 I/O Read Command
This command reads data from an agent mapped in the I/O address
space. When decoding I/O commands, the LSI53C1020 decodes the
lower 32 address bits and ignores the upper 32 address bits. The
LSI53C1020 supports this command when operating in either the PCI or
PCI-X bus mode.
2.3.2.4 I/O Write Command
This command writes data to an agent mapped in the I/O address space.
When decoding I/O commands, the LSI53C1020 decodes the lower 32
address bits and ignores the upper 32 address bits. The LSI53C1020
supports this command when operating in either the PCI or PCI-X bus
mode.
2.3.2.5 Memory Read Command
The LSI53C1020 uses this command to read data from an agent
mapped in the memory address space. The target can perform an
anticipatory read if such a read produces no side effects. The
LSI53C1020 supports this command when operating in the PCI bus
mode.
2.3.2.6 Memory Read Dword Command
This command reads up to a single dword of data from an agent mapped
in the memory address space and can only be initiated as a 32-bit
transaction. The target can perform an anticipatory read if such a read
produces no side effects. The LSI53C1020 supports this command when
operating in the PCI-X bus mode.
2.3.2.7 Memory Write Command
This command writes data to an agent mapped in the memory address
space. The target assumes responsibility for data coherency when it