521 datasheet(69/96 Pages) INTEL

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Datasheet

Land Listing and Signal Descriptions

DRDY#

Input/

Output

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 de-asserted to insert idle clocks. This signal must connect the

appropriate pins/lands of all processor FSB agents.

DSTBN[3:0]#

Input/

Output

DSTBN[3:0]# are the data strobes used to latch in D[63:0]#.

DSTBP[3:0]#

Input/

Output

DSTBP[3:0]# are the data strobes used to latch in D[63:0]#.

FCx

Other

FC signals are signals that are available for compatibility with other processors.

FERR#/PBE#

Output

FERR#/PBE# (floating point error/pending break event) is a multiplexed signal

and its meaning is qualified by STPCLK#. When STPCLK# is not asserted,

FERR#/PBE# indicates a floating-point error and will be asserted when the

processor detects an unmasked floating-point error. When STPCLK# is not

asserted, FERR#/PBE# is similar to the ERROR# signal on the Intel 387

coprocessor, and is included for compatibility with systems using MS-DOS*-

type floating-point error reporting. When STPCLK# is asserted, an assertion of

FERR#/PBE# indicates that the processor has a pending break event waiting

for service. The assertion of FERR#/PBE# indicates that the processor should

be returned to the Normal state. For additional information on the pending break

event functionality, including the identification of support of the feature and

enable/disable information, refer to volume 3 of the Intel Architecture Software

Developer's Manual and the Intel Processor Identification and the CPUID

Instruction application note.

GTLREF

Input

GTLREF determines the signal reference level for GTL+ input signals. GTLREF

is used by the GTL+ receivers to determine if a signal is a logical 0 or logical 1.

GTLREF_SEL

Output

GTLREF_SEL is used to select the appropriate chipset GTLREF voltage.

HIT#

HITM#

Input/

Output

Input/

Output

HIT# (Snoop Hit) and HITM# (Hit Modified) convey transaction snoop operation

results. Any FSB agent may assert both HIT# and HITM# together to indicate

that it requires a snoop stall, which can be continued by reasserting HIT# and

HITM# together.

IERR#

Output

IERR# (Internal Error) is asserted by a processor as the result of an internal

error. Assertion of IERR# is usually accompanied by a SHUTDOWN transaction

on the processor FSB. This transaction may optionally be converted to an

external error signal (e.g., NMI) by system core logic. The processor will keep

IERR# asserted until the assertion of RESET#.

This signal does not have on-die termination. Refer to Section 2.5 for

termination requirements.

Table 4-3. Signal Description (Sheet 4 of 8)

Name

Type

Description

Signals

Associated Strobe

D[15:0]#, DBI0#

DSTBN0#

D[31:16]#, DBI1#

DSTBN1#

D[47:32]#, DBI2#

DSTBN2#

D[63:48]#, DBI3#

DSTBN3#

Signals

Associated Strobe

D[15:0]#, DBI0#

DSTBP0#

D[31:16]#, DBI1#

DSTBP1#

D[47:32]#, DBI2#

DSTBP2#

D[63:48]#, DBI3#

DSTBP3#

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