Intel 500 - DATASHEET REV 003 Datasheet page 56

Table 15. Signal Description (Sheet 4 of 8)
Name
DSTBN[3:0]#
DSTBP[3:0]#
FERR#/PBE#
GTLREF
HIT#
HITM#
56
Type
Data strobe used to latch in D[63:0]#.
Signals
D[15:0]#, DINV[0]#
Input/
Output
D[31:16]#, DINV[1]#
D[47:32]#, DINV[2]#
D[63:48]#, DINV[3]#
Data strobe used to latch in D[63:0]#.
Signals
D[15:0]#, DINV[0]#
Input/
Output
D[31:16]#, DINV[1]#
D[47:32]#, DINV[2]#
D[63:48]#, DINV[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# assertion indicates that an
unmasked floating point error has been detected. 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. In both cases, assertion of FERR#/PBE# indicates that the
Output
processor should be returned to the Normal state. When FERR#/
PBE# is asserted, indicating a break event, it remains asserted until
STPCLK# is deasserted. Assertion of PREQ# when STPCLK# is active
also causes an FERR# break event.
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® 64 and IA-32 Intel®
Architectures 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 V
Input receivers to determine if a signal is a logical 0 or logical 1. Please
refer to the appropriate platform design guide for details on GTLREF
implementation.
HIT# (Snoop Hit) and HITM# (Hit Modified) convey transaction
Input/ snoop operation results. Either FSB agent may assert both HIT# and
Output HITM# together to indicate that it requires a snoop stall, which can
be continued by reasserting HIT# and HITM# together.
Package Mechanical Specifications and Pin Information
Description
Associated Strobe
DSTBN[0]#
DSTBN[1]#
DSTBN[2]#
DSTBN[3]#
Associated Strobe
DSTBP[0]#
DSTBP[1]#
DSTBP[2]#
DSTBP[3]#
. GTLREF is used by the AGTL+
CCP
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