Intel E7320 LF80565QH0464M Data Sheet

Document Number: 318080-002

89

D[63:0]#

I/O

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 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 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]#

I/O

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, within a 16-bit group, would 

have been asserted electronically low, the bus agent may invert the data bus signals 

for that particular sub-phase for that 16-bit group.

DBSY#

I/O

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 deasserted. This signal must connect the appropriate pins on all processor 

FSB agents.

DEFER#

I

DEFER# is asserted by an agent to indicate that a transaction cannot be guaranteed 

in-order completion. Assertion of DEFER# is normally the responsibility of the 

addressed memory or I/O agent. This signal must connect the appropriate pins of all 

processor FSB agents.

DP[3:0]#

I/O

DP[3:0]# (Data Parity) provide parity protection for the D[63:0]# signals. They are 

driven by the agent responsible for driving D[63:0]#, and must connect the 

appropriate pins of all processor FSB agents.

DRDY#

I/O

DRDY# (Data Ready) is asserted by the data driver on each data transfer, indicating 

valid data on the data bus. In a multi-common clock data transfer, DRDY# may be 

deasserted to insert idle clocks. This signal must connect the appropriate pins of all 

processor FSB agents.

D[15:0]#

0

0

D[31:16]#

1

1

D[47:32]#

2

2

D[63:48]#

3

3

DBI0#

D[15:0]#

DBI1#

D[31:16]#

DBI2#

D[47:32]#

DBI3#

D[63:48]#