22
Datasheet
Electrical Specifications
NOTES:
1. Refer to
for signal descriptions.
2. In processor systems where there is no debug port 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
for details.
.
2.7
GTL+ Asynchronous Signals
Legacy input signals such as A20M#, IGNNE#, INIT#, SMI#, and STPCLK# use CMOS input
buffers. All of these signals follow the same DC requirements as GTL+ signals, however the
outputs are not actively driven high (during a logical 0 to 1 transition) by the processor. These
signals do not have setup or hold time specifications in relation to BCLK[1:0].
All of the GTL+ Asynchronous signals are required to be asserted/de-asserted for at least six
BCLKs for the processor to recognize the proper signal state. See
for additional timing
requirements for entering and leaving the low power states.
Table 2-4. Signal Characteristics
Signals with R
TT
Signals with no R
TT
A[35:3]#, ADS#, ADSTB[1:0]#, AP[1:0]#, BINIT#,
BNR#, BOOTSELECT
1
, BPRI#, D[63:0]#, DBI[3:0]#,
DBSY#, DEFER#, DP[3:0]#, DRDY#, DSTBN[3:0]#,
DSTBP[3:0]#, HIT#, HITM#, LOCK#, MCERR#,
PROCHOT#, REQ[4:0]#, RS[2:0]#, RSP#, TRDY#
NOTES:
1.
The BOOTSELECT signal has a 500-5000
Ω
pull-up to V
TT
rather than on-die termination.
A20M#, BCLK[1:0], BPM[5:0]#, BR0#, BSEL[2:0],
COMP[1:0], FERR#/PBE#, IERR#, IGNNE#, INIT#,
LINT0/INTR, LINT1/NMI, PWRGOOD, RESET#,
SKTOCC#, SMI#, STPCLK#, TDO, TESTHI[13:0],
THERMDA, THERMDC, THERMTRIP#, VID[5:0],
VTTPWRGD, GTLREF, TCK, TDI, TRST#, TMS
Open Drain Signals
2
2.
Signals that do not have R
TT
, nor are actively driven to their high-voltage level.
BSEL[2:0], VID[5:0], THERMTRIP#, FERR#/PBE#,
IERR#, BPM[5:0]#, BR0#, TDO, VTT_SEL, LL_ID[1:0],
MSID[1:0]
Table 2-5. Signal Reference Voltages
GTLREF
V
TT
/2
BPM[5:0]#, LINT0/INTR, LINT1/NMI, RESET#, BINIT#,
BNR#, HIT#, HITM#, MCERR#, PROCHOT#, BR0#,
A[35:0]#, ADS#, ADSTB[1:0]#, AP[1:0]#, BPRI#, D[63:0]#,
DBI[3:0]#, DBSY#, DEFER#, DP[3:0]#, DRDY#,
DSTBN[3:0]#, DSTBP[3:0]#, LOCK#, REQ[4:0]#, RS[2:0]#,
RSP#, TRDY#
BOOTSELECT, VTTPWRGD, A20M#,
IGNNE#, INIT#, PWRGOOD
STPCLK#, TCK
1
, TDI
, TMS
, TRST#
NOTES:
1.
These signals also have hysteresis added to the reference voltage. See
for more information.
Содержание 520J - Pentium 4 2.80GHz 800MHz 1MB Socket 775 CPU
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