EP80579 Datasheet, PDF (1029/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Table 26-53. Host Interface Parity Errors (Sheet 2 of 2)
Input Scenario
Resulting Behavior
Event
Parity
Error
Resp
SERR# En
(CMD
register,
bit 8)
DPE
(DSR
register,
bit 15)
Master DPE
(DSR
register, bit
8)
Host
System
Error
(USB
Status)
Notes
Downbound
Request Address
Parity Error
Downbound
Request Data
Parity Error
Downbound
Completion
Command Parity
Error
Downbound
Completion Data
Parity Error
Identical to the Command Parity Error rows above
0
X
1
0
1
0
1
0
1
1
1
0
0
Do take the cycle, as normal.
Cycle is taken.
Halt the Host Controller, if currently not
halted.
Drop the write data.
1
No SERR# generated.
(No PERR# on the IMCH/IICH link)
Software can only determine that the
error occurred through the Host Error
interrupt or by polling.
Cycle is taken.
Halt the Host Controller, if currently not
halted.
1
Drop the write data.
SERR# generated.
(No PERR# on the IMCH/IICH link)
This must be treated the same as the Downbound Request Command Parity Error because the error could be
on the completion/request bit.
0
X
1
0
1
0
1
1
1
1
1
1
0
Do take the cycle, as normal.
Cycle is taken.
Halt the Host Controller, if currently not
halted.
Do not forward data to the USB ports.
1
No SERR# generated.
(No PERR# on the IMCH/IICH link)
Software can only determine that the
error occurred through the Host Error
interrupt or by polling.
Cycle is taken.
Halt the Host Controller, if currently not
halted.
1
Do not forward data to the USB ports.
SERR# generated.
(No PERR# on the IMCH/IICH link)
the system instability has not caused a deadlock in some way).
All of the above description is required behavior. The following text describes the CMI-
specific implementation details:
There are three general forms of parity errors that the EHC may detect on its system
interface:
• Command/Address (on cycles from the host side)
— C/A parity error on Host-initiated cycles, or
— Command parity error on Completion packets to CMI
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
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