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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.
synchronous, and asynchronous.
Table 2-3. FSB Signal Groups
Signal Group
GTL+ Common Clock Input
GTL+ Common Clock I/O
GTL+ Source Synchronous I/O
GTL+ Strobes
GTL+ Asynchronous Input
GTL+ Asynchronous Output
GTL+ Asynchronous Input/Output
TAP Input
TAP Output
FSB Clock
Power/Other
Datasheet
Table 2-3
identifies which signals are common clock, source
Type
Synchronous to
BPRI#, DEFER#, RS[2:0]#, RSP#, TRDY#
BCLK[1:0]
Synchronous to
AP[1:0]#, ADS#, BINIT#, BNR#, BPM[5:0]#, BR0#, DBSY#,
BCLK[1:0]
DP[3:0]#, DRDY#, HIT#, HITM#, LOCK#, MCERR#
REQ[4:0]#, A[16:3]#
Synchronous to assoc.
A[35:17]#
strobe
D[15:0]#, DBI0#
D[31:16]#, DBI1#
D[47:32]#, DBI2#
D[63:48]#, DBI3#
Synchronous to
ADSTB[1:0]#, DSTBP[3:0]#, DSTBN[3:0]#
BCLK[1:0]
A20M#, IGNNE#, INIT#, LINT0/INTR, LINT1/NMI, SMI#,
STPCLK#, RESET#
FERR#/PBE#, IERR#, THERMTRIP#
PROCHOT#
Synchronous to TCK
TCK, TDI, TMS, TRST#
Synchronous to TCK
TDO
Clock
BCLK[1:0], ITP_CLK[1:0]
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#
VTT_OUT_LEFT, VTT_OUT_RIGHT, VTT_SEL, LL_ID[1:0],
FCx, VSS_MB_REGULATION, VCC_MB_REGULATION,
MSID[1:0]
Electrical Specifications
1
Signals
Signals
3
3
2
2
, VTTPWRGD, BOOTSELECT, PWRGOOD,
Associated Strobe
ADSTB0#
ADSTB1#
DSTBP0#, DSTBN0#
DSTBP1#, DSTBN1#
DSTBP2#, DSTBN2#
DSTBP3#, DSTBN3#
21
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