641 datasheet(66/106 Pages) INTEL

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Land Listing and Signal Descriptions

Datasheet

BR0#

Input/

Output

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.

BSEL[2:0]

Output

The BCLK[1:0] frequency select signals BSEL[2:0] are used to

select the processor input clock frequency. Table 18 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

Chapter 2.

COMP[5:4,1:0]

Analog

COMP[1:0] must be terminated to VSS on the system board using

precision resistors. COMP[5:4] must be terminated to VTT on the

system board using precision resistors.

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.

Table 25.

Signal Description (Sheet 1 of 9)

Name

Type

Description

Quad-Pumped Signal Groups

Data Group

DSTBN#/

DSTBP#

DBI#

D[15:0]#

D[31:16]#

D[47:32]#

D[63:48]#

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