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Datasheet

Electrical Specifications

2.6

FSB Signal Groups

The FSB signals have been combined into groups by buffer type. GTL+ input signals have

differential input buffers, which use GTLREF as a reference level. In this document, the term

"GTL+ Input" refers to the GTL+ input group as well as the GTL+ I/O group when receiving.

Similarly, "GTL+ Output" refers to the GTL+ output group as well as the GTL+ I/O group when

driving.

With the implementation of a source synchronous data bus comes the need to specify two sets of

timing parameters. One set is for common clock signals which are dependent upon the rising edge

of BCLK0 (ADS#, HIT#, HITM#, etc.) and the second set is for the source synchronous signals

which are relative to their respective strobe lines (data and address) as well as the rising edge of

BCLK0. Asychronous signals are still present (A20M#, IGNNE#, etc.) and can become active at

any time during the clock cycle. Table 2-3 identifies which signals are common clock, source

synchronous, and asynchronous.

Table 2-3. FSB Signal Groups

Signal Group

Type

Signals1

GTL+ Common Clock Input

Synchronous to

BCLK[1:0]

BPRI#, DEFER#, RS[2:0]#, RSP#, TRDY#

GTL+ Common Clock I/O

Synchronous to

BCLK[1:0]

AP[1:0]#, ADS#, BINIT#, BNR#, BPM[5:0]#, BR0#, DBSY#,

DP[3:0]#, DRDY#, HIT#, HITM#, LOCK#, MCERR#

GTL+ Source Synchronous I/O

Synchronous to assoc.

strobe

GTL+ Strobes

Synchronous to

BCLK[1:0]

ADSTB[1:0]#, DSTBP[3:0]#, DSTBN[3:0]#

GTL+ Asynchronous Input

A20M#, IGNNE#, INIT#, LINT0/INTR, LINT1/NMI, SMI#,

STPCLK#, RESET#

GTL+ Asynchronous Output

FERR#/PBE#, IERR#, THERMTRIP#

GTL+ Asynchronous Input/Output

PROCHOT#

TAP Input

Synchronous to TCK

TCK, TDI, TMS, TRST#

TAP Output

Synchronous to TCK

TDO

FSB Clock

Clock

BCLK[1:0], ITP_CLK[1:0]2

Power/Other

VCC, VTT, VCCA, VCCIOPLL, VID[5:0], VSS, VSSA, GTLREF,

COMP[1:0], RESERVED, TESTHI[13:0], THERMDA,

THERMDC, VCC_SENSE, VSS_SENSE, BSEL[2:0],

SKTOCC#, DBR#2, VTTPWRGD, BOOTSELECT, PWRGOOD,

VTT_OUT_LEFT, VTT_OUT_RIGHT, VTT_SEL, LL_ID[1:0],

FCx, VSS_MB_REGULATION, VCC_MB_REGULATION,

MSID[1:0]

Signals

Associated Strobe

REQ[4:0]#, A[16:3]#3

ADSTB0#

A[35:17]#3

ADSTB1#

D[15:0]#, DBI0#

DSTBP0#, DSTBN0#

D[31:16]#, DBI1#

DSTBP1#, DSTBN1#

D[47:32]#, DBI2#

DSTBP2#, DSTBN2#

D[63:48]#, DBI3#

DSTBP3#, DSTBN3#

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