Land Listing and Signal Descriptions
70 Datasheet
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. 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]#
Input/
Output
REQ[4:0]# (Request Command) must connect the appropriate
pins/lands of all processor FSB agents. They are asserted by the
current bus owner to define the currently active transaction type.
These signals are source synchronous to ADSTB0#.
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 one millisecond after V
CC
and BCLK have reached their
proper specifications. On observing active RESET#, all FSB agents
will de-assert their outputs within two clocks. RESET# must not be
kept 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 Section 6.1.
This signal does not have on-die termination and must be
terminated on the system board.
RESERVED
All RESERVED lands must remain unconnected. Connection of
these lands to V
CC
, V
SS
, V
TT
, or to any other signal (including each
other) can result in component malfunction or incompatibility with
future processors.
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/lands of all processor FSB
agents.
SKTOCC# Output
SKTOCC# (Socket Occupied) will be pulled to ground by the
processor. System board designers may use this signal to
determine if the processor is present.
Table 4-3. Signal Description (Sheet 7 of 10)
Name Type Description
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