L2500 datasheet(55/91 Pages) INTEL

55 / 91 page

Datasheet

Package Mechanical Specifications and Pin Information

PROCHOT#

Input/

Output

As an output, PROCHOT# (Processor Hot) will go active when the

processor temperature monitoring sensor detects that the

processor has reached its maximum safe operating temperature.

This indicates that the processor Thermal Control Circuit (TCC) has

been activated, if enabled. As an input, assertion of PROCHOT# by

the system will activate the TCC, if enabled. The TCC will remain

active until the system deasserts PROCHOT#.

By default PROCHOT# is configured as an output only. Bidirectional

PROCHOT# must be enabled via the BIOS.

For termination requirements please contact your Intel

representative.

This signal may require voltage translation on the motherboard.

Please contact your Intel representative for more details.

PSI#

Output

Processor Power Status Indicator signal. This signal is asserted

when the processor is in a normal state (HFM and LFM) and lower

state (Deep Sleep and Deeper Sleep).

Please contact your Intel representative for more details on the

PSI# signal.

PWRGOOD

Input

PWRGOOD (Power Good) is a processor input. The processor

requires this signal to be a clean indication that the clocks and

power supplies are stable and within their specifications. ‘Clean’

implies that the signal will remain low (capable of sinking leakage

current), without glitches, from the time that the power supplies

are turned on until they come within specification. The signal must

then transition monotonically to a high state.

The PWRGOOD signal must be supplied to the processor; it is used

to protect internal circuits against voltage sequencing issues. It

should be driven high throughout boundary scan operation.

For termination requirements please contact your Intel

representative.

REQ[4:0]#

Input/

Output

REQ[4:0]# (Request Command) must connect the appropriate pins

of both FSB agents. They are asserted by the current bus owner to

define the currently active transaction type. These signals are

source synchronous to ADSTB[0]#.

RESET#

Input

Asserting the RESET# signal resets the processor to a known state

and invalidates its internal caches without writing back any of their

contents. For a power-on Reset, RESET# must stay active for at

least two milliseconds after VCC and BCLK have reached their

proper specifications. On observing active RESET#, both FSB

agents will deassert their outputs within two clocks. All processor

straps must be valid within the specified setup time before RESET#

is deasserted.

For termination requirements please contact your Intel

representative and implementation details. There is a 55 Ω

(nominal) on die pull-up resistor on this signal.

RS[2:0]#

Input

RS[2:0]# (Response Status) are driven by the response agent (the

agent responsible for completion of the current transaction), and

must connect the appropriate pins of both FSB agents.

RSVD

Reserved

/No

Connect

These pins are RESERVED and must be left unconnected on the

board. However, it is recommended that routing channels to these

pins on the board be kept open for possible future use. Please

contact your Intel representative for more details.

Table 17.

Signal Description (Sheet 7 of 9)

Name

Type

Description

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