Table of Contents
Advertisement
Table 25.
Signal Description (Sheet 7 of 10)
Name
PWRGOOD
REQ[4:0]#
RESET#
RESERVED
RS[2:0]#
SKTOCC#
70
Type
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
Input
then transition monotonically to a high state. PWRGOOD can be
driven inactive at any time, but clocks and power must again be
stable before a subsequent rising edge of PWRGOOD.
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.
REQ[4:0]# (Request Command) must connect the appropriate
Input/
pins/lands of all processor FSB agents. They are asserted by the
Output
current bus owner to define the currently active transaction type.
These signals are source synchronous to ADSTB0#.
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 one millisecond after V
specifications. On observing active RESET#, all FSB agents will de-
assert their outputs within two clocks. RESET# must not be kept
Input
asserted for more than 10 ms while PWRGOOD is asserted.
A number of bus signals are sampled at the active-to-inactive
transition of RESET# for power-on configuration. These
configuration options are described in the
This signal does not have on-die termination and must be
terminated on the system board.
All RESERVED lands must remain unconnected. Connection of these
lands to V
, V
CC
SS
can result in component malfunction or incompatibility with future
processors.
RS[2:0]# (Response Status) are driven by the response agent (the
agent responsible for completion of the current transaction), and
Input
must connect the appropriate pins/lands of all processor FSB
agents.
SKTOCC# (Socket Occupied) will be pulled to ground by the
Output
processor. System board designers may use this signal to
determine if the processor is present.
Land Listing and Signal Descriptions
Description
and BCLK have reached their proper
CC
Section
, V
, or to any other signal (including each other)
TT
6.1.
Datasheet
Advertisement
Table of Contents
