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Land Listing and Signal Descriptions
Table 25.
Signal Description (Sheet 2 of 10)
Name
BPM[5:0]#
BPRI#
BR0#
BSEL[2:0]
COMP[3:0],
COMP8
Datasheet
Type
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
Input/
port. PRDY# is a processor output used by debug tools to
Output
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. See
termination requirements.
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
Input
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#.
BR0# drives the BREQ0# signal in the system and is used by the
processor to request the bus. During power-on configuration this
Input/
signal is sampled to determine the agent ID = 0.
Output
This signal does not have on-die termination and must be
terminated.
The BCLK[1:0] frequency select signals BSEL[2:0] are used to
select the processor input clock frequency.
possible combinations of the signals and the frequency associated
Output
with each combination. The required frequency is determined by
the processor, chipset, and clock synthesizer. All agents must
operate at the same frequency. For more information about these
signals, including termination recommendations See
COMP[3:0] and COMP8 must be terminated to V
Analog
board using precision resistors.
Description
Section 2.6.2
Table 16
defines the
Section
on the system
SS
for
2.8.2.
65
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