Cmos Asynchronous And Open Drain Asynchronous Signals; Test Access Port (Tap) Connection; Platform Environmental Control Interface (Peci) Dc Specifications; Dc Characteristics - Intel E5410 - Cpu Xeon Quad Core 2.33Ghz Fsb1333Mhz 12M Lga771 Tray Datasheet

2.8 CMOS Asynchronous and Open Drain
Asynchronous Signals
Legacy input signals such as A20M#, IGNNE#, INIT#, SMI#, and STPCLK# utilize
CMOS input buffers. Legacy output signals such as FERR#/PBE#, IERR#, PROCHOT#,
and THERMTRIP# utilize open drain output buffers. All of the CMOS and Open Drain
signals are required to be asserted/deasserted for at least eight BCLKs in order for the
processor to recognize the proper signal state. See
specifications. See
leaving the low power states.
2.9

Test Access Port (TAP) Connection

Due to the voltage levels supported by other components in the Test Access Port (TAP)
logic, it is recommended that the processor(s) be first in the TAP chain followed by any
other components within the system. A translation buffer should be used to connect to
the rest of the chain unless one of the other components is capable of accepting an
input of the appropriate voltage. Similar considerations must be made for TCK, TDO,
TMS, and TRST#. Two copies of each signal may be required with each driving a
different voltage level.
2.10 Platform Environmental Control Interface (PECI)

DC Specifications

PECI is an Intel proprietary one-wire interface that provides a communication channel
between Intel processors and chipset components to external thermal monitoring
devices. The Quad-Core Intel® Xeon® Processor 5400 Series contains Digital Thermal
Sensor (DTS) sprinkled both inside and outside the cores in a die. These sensors are
implemented as analog-to-digital converters calibrated at the factory for reasonable
accuracy to provide a digital representation of relative processor temperature. PECI
provides an interface to relay the highest DTS temperature within a die to external
devices for thermal/fan speed control. More detailed information may be found in the
Platform Environment Control Interface (PECI) Specification.
2.10.1

DC Characteristics

The PECI interface operates at a nominal voltage set by V
specifications shown in
interface supply. V
devices will operate at the V
system. For specific nominal V
24
Quad-Core Intel® Xeon® Processor 5400 Series Electrical Specifications
Chapter 6 for additional timing requirements for entering and
Table 2-10 is used with devices normally operating from a V
nominal levels will vary between processor families. All PECI
TT
level determined by the processor installed in the
TT
levels, refer to the appropriate processor EMTS.
TT
Section 2.13 for the DC
. The set of DC electrical
TT
TT