Intel Q9300 Data Sheet - Page 66

Table 4-3., Signal Description, Sheet 3 of 10 - driver

Page 66 highlights

Land Listing and Signal Descriptions Table 4-3. Signal Description (Sheet 3 of 10) Name Type Description D[63:0]# (Data) are the data signals. These signals provide a 64bit data path between the processor FSB agents, and must connect the appropriate pins/lands on all such agents. The data driver asserts DRDY# to indicate a valid data transfer. D[63:0]# are quad-pumped signals and will, thus, be driven four times in a common clock period. D[63:0]# are latched off the falling edge of both DSTBP[3:0]# and DSTBN[3:0]#. Each group of 16 data signals correspond to a pair of one DSTBP# and one DSTBN#. The following table shows the grouping of data signals to data strobes and DBI#. D[63:0]# Input/ Output Quad-Pumped Signal Groups Data Group DSTBN#/ DSTBP# DBI# D[15:0]# 0 0 D[31:16]# 1 1 D[47:32]# 2 2 D[63:48]# 3 3 DBI[3:0]# DBR# DBSY# Furthermore, the DBI# signals determine the polarity of the data signals. Each group of 16 data signals corresponds to one DBI# signal. When the DBI# signal is active, the corresponding data group is inverted and therefore sampled active high. DBI[3:0]# (Data Bus Inversion) are source synchronous and indicate the polarity of the D[63:0]# signals.The DBI[3:0]# signals are activated when the data on the data bus is inverted. If more than half the data bits, within a 16-bit group, would have been asserted electrically low, the bus agent may invert the data bus signals for that particular sub-phase for that 16-bit group. Input/ Output DBI[3:0] Assignment To Data Bus Bus Signal Data Bus Signals Output Input/ Output DBI3# D[63:48]# DBI2# D[47:32]# DBI1# D[31:16]# DBI0# D[15:0]# DBR# (Debug Reset) is used only in processor systems where no debug port is implemented on the system board. DBR# is used by a 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 agents. 66 Datasheet

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Land Listing and Signal Descriptions
66
Datasheet
D[63:0]#
Input/
Output
D[63:0]# (Data) are the data signals. These signals provide a 64-
bit data path between the processor FSB agents, and must
connect the appropriate pins/lands on all such agents. The data
driver asserts DRDY# to indicate a valid data transfer.
D[63:0]# are quad-pumped signals and will, thus, be driven four
times in a common clock period. D[63:0]# are latched off the
falling edge of both DSTBP[3:0]# and DSTBN[3:0]#. Each group
of 16 data signals correspond to a pair of one DSTBP# and one
DSTBN#. The following table shows the grouping of data signals
to data strobes and DBI#.
Furthermore, the DBI# signals determine the polarity of the data
signals. Each group of 16 data signals corresponds to one DBI#
signal. When the DBI# signal is active, the corresponding data
group is inverted and therefore sampled active high.
DBI[3:0]#
Input/
Output
DBI[3:0]# (Data Bus Inversion) are source synchronous and
indicate the polarity of the D[63:0]# signals.The DBI[3:0]#
signals are activated when the data on the data bus is inverted. If
more than half the data bits, within a 16-bit group, would have
been asserted electrically low, the bus agent may invert the data
bus signals for that particular sub-phase for that 16-bit group.
DBR#
Output
DBR# (Debug Reset) is used only in processor systems where no
debug port is implemented on the system board. DBR# is used by
a 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#
Input/
Output
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 agents.
Table 4-3.
Signal Description
(Sheet 3 of 10)
Name
Type
Description
Quad-Pumped Signal Groups
Data Group
DSTBN#/
DSTBP#
DBI#
D[15:0]#
0
0
D[31:16]#
1
1
D[47:32]#
2
2
D[63:48]#
3
3
DBI[3:0] Assignment To Data Bus
Bus Signal
Data Bus
Signals
DBI3#
D[63:48]#
DBI2#
D[47:32]#
DBI1#
D[31:16]#
DBI0#
D[15:0]#