MSI H6M-P23 (B3) Specifications download pdf (Page 38)

2-12 Functional Description

2.3.2.5 Memory Read Command

The LSISAS1064 uses the Memory Read 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

LSISAS1064 supports this command when operating in the PCI bus

mode.

2.3.2.6 Memory Read Dword Command

The Memory Read Dword 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 LSISAS1064 supports

this command when operating in the PCI-X bus mode.

2.3.2.7 Memory Write Command

The Memory Write command writes data to an agent mapped in the

memory address space. The target assumes responsibility for data

coherency when it returns “ready.” The LSISAS1064 supports this

command when operating in either the PCI or PCI-X bus mode.

2.3.2.8 Alias to Memory Read Block Command

This command is reserved for future implementations of the PCI

speciﬁcation. The LSISAS1064 never generates this command as a

master. When a slave, the LSISAS1064 supports this command using

the Memory Read Block command.

2.3.2.9 Alias to Memory Write Block Command

This command is reserved for future implementations of the PCI

speciﬁcation. The LSISAS1064 never generates this command as a

master. When a slave, the LSISAS1064 supports this command using

the Memory Write Block command.

2.3.2.10 Conﬁguration Read Command

The Conﬁguration Read command reads the conﬁguration space of a

device. The LSISAS1064 never generates this command as a master,

but does respond to it as a slave. A device on the PCI bus selects the

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MSI H6M-P23 (B3) Specifications Page 38