Package Mechanical Specifications and Pin Information
Table 16.
Signal Description (Sheet 4 of 8)
Name
Type
Description
Data strobe used to latch in D[63:0]#.
Signals
Associated
Strobe
Input/
Output
D[15:0]#, DINV[0]#
DSTBP[0]#
DSTBP[3:0]#
D[31:16]#, DINV[1]# DSTBP[1]#
D[47:32]#, DINV[2]# DSTBP[2]#
D[63:48]#, DINV[3]# DSTBP[3]#
FERR# (Floating-point Error)PBE#(Pending Break Event) is a
multiplexed signal and its meaning is qualified with STPCLK#. When
STPCLK# is not asserted, FERR#/PBE# indicates a floating point
when the processor detects an unmasked floating-point error. FERR#
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.
When FERR#/PBE# is asserted, indicating a break event, it will
remain asserted until STPCLK# is deasserted. Assertion of PREQ#
when STPCLK# is active will also cause an FERR# break event.
FERR#/PBE#
Output
For additional information on the pending break event functionality,
including 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
CPUID Instruction application note.
GTLREF determines the signal reference level for AGTL+ input pins.
GTLREF should be set at 2/3 VCCP. GTLREF is used by the AGTL+
receivers to determine if a signal is a logical 0 or logical 1.
GTLREF
Input
Input/
Output
HIT# (Snoop Hit) and HITM# (Hit Modified) convey transaction
snoop operation results. Either 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.
HIT#
HITM#
Input/
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 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#, BINIT#, or INIT#.
IERR#
Output
IGNNE# (Ignore Numeric Error) is asserted to force the processor to
ignore a numeric error and continue to execute noncontrol floating-
point instructions. If IGNNE# is deasserted, the processor generates
an exception on a noncontrol floating-point instruction if a previous
floating-point instruction caused an error. IGNNE# has no effect
when the NE bit in control register 0 (CR0) is set.
IGNNE#
Input
IGNNE# is an asynchronous signal. However, to ensure recognition
of this signal following an Input/Output write instruction, it must be
valid along with the TRDY# assertion of the corresponding Input/
Output Write bus transaction.
58
Datasheet
INTEL [ INTEL ]
