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Dual-Core Intel Itanium Processor 9000 Series Datasheet
Electrical Specifications
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All system bus outputs should be treated as open drain signals and require a high level
source provided by the VCTERM supply.
AGTL+ inputs have differential input buffers which use VREF as a reference level. AGTL+
output signals require termination to VCTERM. 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
Section 2.2.2.
The HSTL clock signals are the differential clock inputs for the processor. The SMBus
signals and LVTTL power pod signals are driven using the 3.3V CMOS logic levels listed
Table 2-1.
Itanium 2 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 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]#
1, 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#
PWRGOOD
HSTL Clock Signals
BCLKn, BCLKp
TCK, TDI, TMS, TRST#
TDO
System Management Sign
als13.3V, SMA[2:0], SMSC, SMSD, SMWP, THRMALERT#
Power Signals
GND, VCTERM
CPUPRES#, OUTEN, PPODGD#
Other
TERMA, TERMB, TUNER1, TUNER2, TUNER3, VCCMON, VSSMON