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Dual-Core Intel
®
 Itanium
®
 Processor 9000 and 9100 Series Datasheet
Electrical Specifications
..
All system bus outputs should be treated as open drain signals and require a high-level 
source provided by the V
CTERM
 supply.
AGTL+ inputs have differential input buffers which use V
REF
 as a reference level. AGTL+ 
output signals require termination to V
CTERM
. In this document, “AGTL+ Input Signals” 
refers to the AGTL+ input group as well as the AGTL+ I/O group when receiving. 
Similarly, “AGTL+ Output Signals” refers to the AGTL+ output group as well as the 
AGTL+ I/O group when driving.
The Test Access Port (TAP) connection input signals use a non-differential receiver with 
levels that are similar to AGTL+. No reference voltage is required for these signals. The 
TAP Connection Output signals are AGTL+ output signals.
The processor system bus requires termination on both ends of the bus. The processor 
system bus supports both on-die and off-die termination controlled by two pins, TERMA 
and TERMB. Please see the TERMA and TERMB pin description in 
The HSTL clock signals are the differential clock inputs for the processor. The SMBus 
signals and LVTTL power pod signals are driven using the 3.3 V CMOS logic levels listed 
in 
, respectively. 
Table 2-1.
Itanium
®
 Processor System Bus Signal Groups
Group Name
Signals
AGTL+ Input Signals
BPRI#, BR[3:1]#, DEFER#, GSEQ#, ID[9:0]#, IDS#, RESET#
1
, RS[2:0]#, 
RSP#, TRDY#
Notes:
1. Signals will not be terminated on-die even when on-die termination (ODT) is enabled. See the Intel
® 
Itanium
®
2 Processor Hardware Developer’s Manual for further details.
AGTL+ I/O Signals
A[49:3]#, ADS#, AP[1:0]#, BERR#, BINIT#, BNR#, BPM[5:0]#
, BR0#, 
D[127:0]#, DBSY#, DEP[15:0]#, DRDY#, HIT#, HITM#, LOCK#, 
REQ[5:0]#, RP#, SBSY#, STBN[7:0]#, STBP[7:0]#, TND#
AGTL+ Output Signals
FERR#, THRMTRIP#, DBSY[1:0]#, DRDY[1:0]#, SBSY[1:0]#
Special AGTL+ Asynchronous 
Interrupt Input Signals
A20M#, IGNNE#, INIT#, LINT[1,0], PMI#
Power Good Signal
PWRGOOD
HSTL Clock Signals
BCLKn, BCLKp
TAP Input Signals
TCK, TDI, TMS, TRST#
TAP Output Signals
TDO
System Management Signals
3.3 V, SMA[2:0], SMSC, SMSD, SMWP, THRMALERT#
Power Signals
GND, VCTERM
LVTTL Power Pod Signals
CPUPRES#, OUTEN, PPODGD#
Other
TERMA, TERMB, TUNER1, TUNER2, TUNER3, VCCMON, VSSMON