Datasheet

Intel
®
Xeon
®
Processor 5500 Series Datasheet, Volume 1 121
Thermal Specifications
Because a particular MbxSend() command may specify an update to potentially critical
registers inside the processor, it includes an Assured Write FCS (AW FCS) byte as part
of the write data payload. In the event that the AW FCS mismatches with the client-
calculated FCS, the client will abort the write and will always respond with a bad Write
FCS.
6.3.2.7.2 Command Format
The MbxSend() format is as follows:
Write Length: 7
Read Length: 1
Command: 0xd1
Multi-Domain Support: Yes (see Table 6-26)
Description: Deposits the Request Type and associated 4-byte data in the Mailbox
interface and returns a completion code byte with the details of the execution results.
Refer to Section 6.3.4.2 for completion code definitions.
Figure 6-23. MbxSend() Command Data Format
Byte #
Byte
Definition
0
Request Type
1
Data[31:0]
234
Figure 6-24. MbxSend()
Byte #
Byte
Definition
0
Client Address
1
Write Length
0x07
2
Read Length
0x01
10
FCS
3
Cmd Code
0xd1
11
Completion
Code
12
FCS
5 6 7 8
LSB MSBData[31:0]
10 119
AW FCS
4
Request Type