Specifications

7-34 System Registers

Table 7-15 Mailbox Data Structure Description (Continued)

QW Bit(s) Name Description

<63:0> RDATA Read Data. For read commands, contains the data returned.

For write data commands, the field is Unpredictable.

<0> DON Done. For read commands, indicates that the <ERR>,

<STATUS>, and <RDATA> fields are valid. For all commands,

indicates that the mailbox structure may be safely modified by

host software.

<1> ERR Error. If set on a read command, indicates that an error was

encountered. Valid only on read commands and when <DON>

is set. This field is Unpredictable on write commands. See Al-

pha SRM.

<63:2> STATUS Operation Completion Status. Contains information specific

to the bridge implementation. Valid only on read commands

and when <DON> is set. This field is Unpredictable on write

commands.