User Manual

Thermal Specifications
152 Intel
®
Xeon
®
Processor 5600 Series Datasheet Volume 1
Note that the 4-byte data defined above is sent in standard PECI ordering with LSB first
and MSB last.
If MbxSend() response returns a bad FCS in the data, the completion code can't be
trusted and the semaphore may or may not be taken. In order to clean out the
interface, an MbxGet() must be issued and the response data should be discarded.
7.3.2.8 MbxGet()
The MbxGet() command is utilized for retrieving response data from the generic
Mailbox interface as well as for unlocking the acquired mailbox. Please refer to
Section 7.3.2.7 for details regarding the MbxSend() command. Many of the
fundamental concepts of Mailbox ownership, release, and management are discussed
in Section 7.3.2.9.
7.3.2.8.1 Write Data
The MbxGet() command is designed to retrieve response data from a previously
deposited request. In order to guarantee alignment between the temporally separated
request (MbxSend) and response (MbxGet) commands, the originally granted
Transaction ID (sent as part of the passing MbxSend() completion code) must be issued
as part of the MbxGet() request.
Any mailbox request made with an illegal or unlocked Transaction ID will get a failed
completion code response. If the Transaction ID matches an outstanding transaction ID
associated with a locked mailbox, the command will complete successfully and the
response data will be returned to the originator.
Figure 7-29. 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
Table 7-29. MbxSend() Response Definition
Response Meaning
Bad FCS Electrical error
0x4X Semaphore is granted with a Transaction ID of ‘X’
0x80 Error causing a response timeout. Either due to a rare, internal timing condition or a
processor RESET condition or processor S1 state. Retry is appropriate outside of the
RESET or S1 states.
0x86 Mailbox interface is unavailable or busy