Schematic Checklist
188
Design Guide
BPRI#
•
Connect to both processors and the MCH.
•
Used to arbitrate for ownership of
the processor system bus.
•
AGTL+ Common Clock Input.
•
Refer to
BR[3:0]#
•
Connect BR[0]# to the MCH’s BREQ0# pin,
Processor 0’s BR0# pin, and Processor 1’s
BR1# pin. Terminate using a 50
Ω ± 5%
pull-
up resistor at Processor 0.
•
Connect BR[1]# signal to Processor 0’s
BR1# pin and Processor 1’s BR0# pin.
Terminate both ends of the bus using
50
Ω
± 5% pull-up resistors.
•
BR[3:2]# should be terminated individually at
each processor or be connected between
processors and terminated at one end using
a 50
Ω
± 5% pull-up resistor.
•
for more clarification.
•
Used to arbitrate for ownership of
the processor system bus.
•
These signals do not have on-die
processor termination and must
be terminated on the
motherboard.
•
BR0# is an AGTL+ Common
Clock I/O.
•
BR[3:1]# are AGTL+ Common
Clock Inputs.
•
Refer to
.
COMP[1:0]
•
Terminate to ground separately using
50
Ω
± 1%.
•
Power/Other.
•
Sets the processor’s on-die
termination.
•
Refer to
.
D[63:0]#
3
•
Connect to both processors and the MCH.
•
AGTL+ Source Synchronous I/O.
•
Refer to
DBI[3:0]#
•
Connect to both processors and the MCH.
•
Indicates the polarity of the
D[63:0]#
3
signals.
•
AGTL+ Source Synchronous I/O.
•
Refer to
DBSY#
•
Connect to both processors and the MCH.
•
Asserted by the agent responsible
for driving data on the processor
system bus to indicate that the
data bus is in use.
•
AGTL+ Common Clock I/O.
•
Refer to
DEFER#
•
Connect to both processors and the MCH.
•
Asserted by an agent to indicate
that a transaction cannot be
guaranteed in-order completion.
•
AGTL+ Common Clock Input.
•
Refer to
DP[3:0]#
•
Connect to both processors and the MCH.
•
Provides parity protection for the
D[63:0]#
3
signals.
•
AGTL+ Common Clock I/O.
•
Refer to
DRDY#
•
Connect to both processors and the MCH.
•
Asserted by data driver on each
data transfer to indicate valid data.
•
AGTL+ Common Clock I/O.
•
Refer to
Table 13-1. Processor Schematic Checklist (Sheet 2 of 6)
Checklist Items
Recommendations
Comments
Содержание Xeon
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