Intel Q9400S Data Sheet - Page 65
Table 4-3., Signal Description, Sheet 2 of 10
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Land Listing and Signal Descriptions Table 4-3. Signal Description (Sheet 2 of 10) Name Type Description BPM[5:0]# BPMb[3:0]# BPRI# BR0# BSEL[2:0] COMP[3:0], COMP8 Input/ Output Input Input/ Output Output Analog BPM[5:0]# and BPMb[3:0]# (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]# and BPMb[3:0]# should connect the appropriate pins/lands of all processor FSB agents. BPM[3:0]# are associated with core 0. BPMb[3:0]# are associated with core 1. 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 2.6.2 for 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 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 signal is sampled to determine the agent ID = 0. 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. Table 2-15 defines the possible combinations of the signals and the frequency associated 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 refer to Section 2.8.2. COMP[3:0] and COMP8 must be terminated to VSS on the system board using precision resistors. Datasheet 65