300 Datasheet, PDF (65/95 Pages) DB Lectro Inc – SCREW TYPE SERIES

Land Listing and Signal Descriptions
Table 25.
Signal Description (Sheet 1 of 9)
Name
Type
Description
BCLK[1:0]
BINIT#
BNR#
BOOTSELECT
BPM[5:0]#
BPRI#
BR0#
Input
Input/
Output
The differential pair BCLK (Bus Clock) determines the FSB
frequency. All processor FSB agents must receive these signals to
drive their outputs and latch their inputs.
All external timing parameters are specified with respect to the
rising edge of BCLK0 crossing V_CROSS.
BINIT# (Bus Initialization) may be observed and driven by all
processor FSB agents and if used, must connect the appropriate
pins/lands of all such agents. If the BINIT# driver is enabled during
power-on configuration, BINIT# is asserted to signal any bus
condition that prevents reliable future operation.
If BINIT# observation is enabled during power-on configuration, and
BINIT# is sampled asserted, symmetric agents reset their bus
LOCK# activity and bus request arbitration state machines. The bus
agents do not reset their IOQ and transaction tracking state
machines upon observation of BINIT# activation. Once the BINIT#
assertion has been observed, the bus agents will re-arbitrate for the
FSB and attempt completion of their bus queue and IOQ entries.
If BINIT# observation is disabled during power-on configuration, a
central agent may handle an assertion of BINIT# as appropriate to
the error handling architecture of the system.
Input/
Output
BNR# (Block Next Request) is used to assert a bus stall by any bus
agent unable to accept new bus transactions. During a bus stall, the
current bus owner cannot issue any new transactions.
Input
Input/
Output
This input is required to determine whether the processor is installed
in a platform that supports the Celeron D processor. The processor
will not operate if this signal is low. This input has a weak internal
pull-up to V_TT.
BPM[5:0]# (Breakpoint Monitor) are breakpoint and performance
monitor signals. They are outputs from the processor which indicate
the status of breakpoints and programmable counters used for
monitoring processor performance. BPM[5:0]# should connect the
appropriate pins/lands of all processor FSB agents.
BPM4# provides PRDY# (Probe Ready) functionality for the TAP
port. PRDY# is a processor output used by debug tools to determine
processor debug readiness.
BPM5# provides PREQ# (Probe Request) functionality for the TAP
port. PREQ# is used by debug tools to request debug operation of
the processor.
These signals do not have on-die termination. Refer to Section 2.5.2
for termination requirements.
Input
BPRI# (Bus Priority Request) is used to arbitrate for ownership of
the processor FSB. It must connect the appropriate pins/lands of all
processor FSB agents. Observing BPRI# active (as asserted by the
priority agent) causes all other agents to stop issuing new requests,
unless such requests are part of an ongoing locked operation. The
priority agent keeps BPRI# asserted until all of its requests are
completed, then releases the bus by de-asserting BPRI#.
Input/
Output
BR0# drives the BREQ0# signal in the system and is used by the
processor to request the bus. During power-on configuration this
signal is sampled to determine the agent ID = 0.
This signal does not have on-die termination and must be
terminated.
Datasheet
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