FW82371EBSL37M Intel, FW82371EBSL37M Datasheet - Page 25

• Manufacturer Part Number: FW82371EBSL37M
• Description: Embedded Processor 352-Pin BGA
• Manufacturer: Intel

Specifications of FW82371EBSL37M

• Package: 352BGA

5.
Problem:
Implication: The system will hang if the PIIX4/PIIX4E/PIIX4M hold STPCLK# asserted indefinitely.
Workaround: The 87% thermal duty cycle (THRM_DTY) in the CNTB register, and the 87% throttle duty cycle
Status:
Specification Update
R
STPCLK# Deassertion Time
Under certain conditions the PIIX4/PIIX4E/PIIX4M can deassert STPCLK# for a short time. A
short deassertion of STPCLK# can cause the CPU to miss the STPCLK# transition. If the CPU
misses the transition the PIIX4/PIIX4E/PIIX4M will continue to assert STPCLK# indefinitely.
(THTL_DTY) in the PCNTRL register are no longer supported. These bit positions are now
reserved. System BIOS must also disable system clock control before the PIIX4/PIIX4E/PIIX4M
begin thermal throttling.
If the THRM_EN bit is set and the SCI_EN bit is cleared, an SMI# is generated by the
PIIX4/PIIX4E/PIIX4M upon assertion of the THRM# signal. The SMI# handler has 2 seconds to
disable all system clock control functionality before the PIIX4/PIIX4E/PIIX4M begin thermal
throttling.
If the THRM_EN bit is set and the SCI_EN bit is set, an SCI is generated by the
PIIX4/PIIX4E/PIIX4M upon assertion of the THRM# signal. The interrupt handler has 2 seconds
to disable all system clock control functionality before the PIIX4/PIIX4E/PIIX4M begin thermal
throttling.
This will not be fixed on PIIX4. This is planned to be incorporated into the PIIX4 datasheet as a
change to the specification.
This erratum was fixed in PIIX4E and PIIX4M. In PIIX4E and PIIX4M the 87% thermal duty
cycle (THRM)DTY) in the CNTB register, and the 87% throttle duty cycle (THRTL_DTY) in the
PCNTRL register are supported. Upon assertion of the THRM# signal, no special provisions need
to be taken. The PIIX4E and PIIX4M will guarantee that STPCLK# signal stays high for at least
32 s (26.7 s for PIIX4M).
QH
TD
Intel
®
Pseudo
Pseudo
82371AB PIIX4, 82371EB PIIX4E, 82371MB PIIX4M
QH
TD
Bandwidth Reclam ation Loop
QH
TD
QH
TD
TD
25