Land Listing and Signal Descriptions
Table 25.
Signal Description (Sheet 1 of 9)
Name
Type
Description
DBR# (Debug Reset) is used only in processor systems where no
debug port is implemented on the system board. DBR# is used by a
DBR#
Output debug port interposer so that an in-target probe can drive system
reset. If a debug port is implemented in the system, DBR# is a no
connect in the system. DBR# is not a processor signal.
DBSY# (Data Bus Busy) is asserted by the agent responsible for
driving data on the processor FSB to indicate that the data bus is in
use. The data bus is released after DBSY# is de-asserted. This
signal must connect the appropriate pins/lands on all processor FSB
Input/
Output
DBSY#
agents.
DEFER# is asserted by an agent to indicate that a transaction
cannot be ensured in-order completion. Assertion of DEFER# is
Input normally the responsibility of the addressed memory or input/output
agent. This signal must connect the appropriate pins/lands of all
processor FSB agents.
DEFER#
DP[3:0]#
DRDY#
DP[3:0]# (Data parity) provide parity protection for the D[63:0]#
Input/ signals. They are driven by the agent responsible for driving
Output D[63:0]#, and must connect the appropriate pins/lands of all
processor FSB agents.
DRDY# (Data Ready) is asserted by the data driver on each data
transfer, indicating valid data on the data bus. In a multi-common
Input/
clock data transfer, DRDY# may be de-asserted to insert idle clocks.
Output
This signal must connect the appropriate pins/lands of all processor
FSB agents.
DSTBN[3:0]# are the data strobes used to latch in D[63:0]#.
Signals
Associated Strobe
D[15:0]#, DBI0#
D[31:16]#, DBI1#
D[47:32]#, DBI2#
D[63:48]#, DBI3#
DSTBN0#
DSTBN1#
DSTBN2#
DSTBN3#
Input/
Output
DSTBN[3:0]#
DSTBP[3:0]# are the data strobes used to latch in D[63:0]#.
Signals
Associated Strobe
D[15:0]#, DBI0#
D[31:16]#, DBI1#
D[47:32]#, DBI2#
D[63:48]#, DBI3#
DSTBP0#
DSTBP1#
DSTBP2#
DSTBP3#
Input/
Output
DSTBP[3:0]#
FC signals are signals that are available for compatibility with other
processors.
FCx
Other
Datasheet
67
INTEL [ INTEL ]
