521 datasheet(22/96 Pages) INTEL

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Datasheet

Electrical Specifications

NOTES:

1. Refer to Section 4.2 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

options. See Section 6.1 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 Section 6.2 for additional timing

requirements for entering and leaving the low power states.

Table 2-4. Signal Characteristics

Signals with R

Signals with no R

A[35:3]#, ADS#, ADSTB[1:0]#, AP[1:0]#, BINIT#,

BNR#, BOOTSELECT1, 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:

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 Signals2

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

VTT/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#, PWRGOOD1, SMI#,

STPCLK#, TCK1, TDI1, TMS1, TRST#1

NOTES:

These signals also have hysteresis added to the reference voltage. See Table 2-13 for more information.

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