Datasheet

Package Mechanical Specifications and Pin Information
44 Datasheet
Signal Name Type Description
DSTBP [3:0]# I/O
Data strobe used to latch in D [63:0]#.
Signals Associated Strobe
D [15:0]# DINV [0]#, DSTBP [0]#
D [31:16]# DINV [1]#, DSTBP [1]#
D [47:32]# DINV [2]#, DSTBP [2]#
D [63:48]# DINV [3]#, DSTBP [3]#
FERR#/PBE# O
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
MSDOS*- 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
de-asserted. Assertion of PREQ# when STPCLK# is active will
also cause 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 Architectures Software Developer's Manuals and the
Intel
®
Processor Identification and CPUID Instruction Application
Note.
For termination requirements please contact your Intel
representative.
CMREF PWR
CMREF determines the signal reference level for CMOS input pins.
CMREF should be set at 1/2 V
CCP
. CMREF is used by the CMOS
receivers to determine if a signal is a logical-0 or logical-1.
NOTE: Because of not using CMOS, CMREF and GTLREF should be
provided with 2/3 V
CCP
.
GTLREF PWR
GTLREF determines the signal reference level for AGTL+ input
pins. GTLREF should be set at 2/3 V
CCP
. GTLREF is used by the
AGTL+ receivers to determine if a signal is a logical-0 or logical-
1.
HIT#
HITM#
I/O
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.