Datasheet 23
Electrical Specifications
NOTES:
1. Refer to Section 4.2 for signal descriptions.
2. In processor systems where no debug port is implemented on the system board, these
signals are used to support a debug port interposer. In systems with the debug port
implemented on the system board, these signals are no connects.
3. The value of these signals during the active-to-inactive edge of RESET# defines the
processor configuration options. See Section 6.1 for details.
4. PROCHOT# signal type is open drain output and CMOS input.
.
.
CMOS
A20M#, IGNNE#, INIT#, LINT0/INTR, LINT1/NMI, SMI#,
STPCLK#, PWRGOOD, TCK, TDI, TMS, TRST#, BSEL[2:],
VID[7:0]
Open Drain
Output
FERR#/PBE#, IERR#, THERMTRIP#, TDO
Open Drain
Input/Output
PROCHOT#
4
FSB Clock Clock BCLK[1:0], ITP_CLK[1:0]
2
Power/Other
VCC, VTT, VCCA, VCCIOPLL, VCCPLL, VSS, VSSA,
GTLREF[3:0], COMP[8,3:0], RESERVED,
TESTHI[13,11:10,7:0], VCC_SENSE,
VCC_MB_REGULATION, VSS_SENSE,
VSS_MB_REGULATION, DBR#
2
, VTT_OUT_LEFT,
VTT_OUT_RIGHT, VTT_SEL, FCx, PECI, MSID[1:0]
Table 7. FSB Signal Groups (Sheet 2 of 2)
Signal Group Type Signals
1
Table 8. Signal Characteristics
Signals with R
TT
Signals with No R
TT
A[35:3]#, ADS#, ADSTB[1:0]#, BNR#, BPRI#,
D[63:0]#, DBI[3:0]#, DBSY#, DEFER#,
DRDY#, DSTBN[3:0]#, DSTBP[3:0]#, HIT#,
HITM#, LOCK#, PROCHOT#, REQ[4:0]#,
RS[2:0]#, TRDY#
A20M#, BCLK[1:0], BSEL[2:0],
COMP[8,3:0], IGNNE#, INIT#, ITP_CLK[1:0],
LINT0/INTR, LINT1/NMI, PWRGOOD,
RESET#, SMI#, STPCLK#,
TESTHI[13,11:10,7:0], VID[7:0],
GTLREF[3:0], TCK, TDI, TMS, TRST#,
MSID[1:0], VTT_SEL
Open Drain Signals
1
NOTES:
1. Signals that do not have R
TT
, nor are actively driven to their high-voltage level.
THERMTRIP#, FERR#/PBE#, IERR#, BPM[5:0]#,
BPMb[3:0]#, BR0#, TDO, FCx
Table 9. Signal Reference Voltages
GTLREF V
TT
/2
BPM[5:0]#, BPMb[3:0]#, RESET#, BNR#, HIT#,
HITM#, BR0#, A[35:0]#, ADS#, ADSTB[1:0]#,
BPRI#, D[63:0]#, DBI[3:0]#, DBSY#, DEFER#,
DRDY#, DSTBN[3:0]#, DSTBP[3:0]#, LOCK#,
REQ[4:0]#, RS[2:0]#, TRDY#
A20M#, LINT0/INTR, LINT1/NMI,
IGNNE#, INIT#, PROCHOT#,
PWRGOOD
1
, SMI#, STPCLK#, TCK
1
,
TDI
1
, TMS
1
, TRST#
1
NOTES:
1. These signals also have hysteresis added to the reference voltage. See Table 11 for more
information.
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