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Chapter 3 - MACSI Host Interface
94
Command Options
No special options are available for this command. Refer to Common IOPB structures for defined options.
Return Status
There are not particular errors currently defined for this IOPB.
Control Flags
Table 3-35. Control Flags
Enable Multiple Completions (MEN)
Setting this bit enables posting of multiple commands completions. Issuing the command with this bit cleared
disables multiple command completions.
Interrupt on Multiple Completion (MEI)
Setting this bit causes the controller to issue an interrupt to the host when posting a multiple command
completion. Not setting this bit prevents any interrupt from being posted, requiring the host to poll the
Command Response Block for returned completions.
Group Interrupt Level / Vector
This field specifies the VMEbus interrupt level and vector to be used when posting back multiple command
completions. These values will override any values specified in the individual IOPBs being returned.
Minimum Group Count
This field is ignored.
Maximum Group Count
This field specifies the maximum number of IOPBs to be returned per completion. For the definition of the returned
structure, please refer to the System Interface section of this chapter.
A maximum of 4 entries will fill the Returned IOPB area. 13 overwrites the Configuration Status Block, and 24 fills
the remainder of short I/O. Setting this value any less than 24 will significantly constrain the performance of the
controller.
Control Flags
Offst 151413121110987654321 0
0x06 MIE MEN