Datasheet

Electrical Specifications
24 Datasheet
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.
.
.
2.7.2 CMOS and Open Drain Signals
Legacy input signals such as A20M#, IGNNE#, INIT#, SMI#, and STPCLK# use CMOS
input buffers. All of the CMOS and Open Drain signals are required to be asserted/de-
asserted for at least four BCLKs in order for the processor to recognize the proper
signal state. See Section 2.7.3 for the DC specifications. See Section 6.2 for additional
timing requirements for entering and leaving the low power states.
Table 9. 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[13:0],
VID[6:1], GTLREF[1:0], TCK, TDI, TMS,
TRST#, VTT_SEL, MSID[1:0]
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]#,
BR0#, TDO, FCx
Table 10. Signal Reference Voltages
GTLREF V
TT
/2
BPM[5:0]#, 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 12 for more
information.