Fsb Signal Groups; Fsb Pin Groups - Intel Pga478 - P4-2ghz 512kb 400mhz Fsb Datasheet

Electrical Specifications—Intel
3.8

FSB Signal Groups

In order to simplify the following discussion, the FSB signals have been combined into
groups by buffer type. AGTL+ input signals have differential input buffers, which use
GTLREF as a reference level. In this document, the term "AGTL+ Input" refers to the
AGTL+ input group as well as the AGTL+ I/O group when receiving. Similarly, "AGTL+
Output" refers to the AGTL+ output group as well as the AGTL+ 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
dependant 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.
and asynchronous.
Table 5.

FSB Pin Groups

Signal Group
AGTL+ Common Clock Input
AGTL+ Common Clock I/O
AGTL+ Source Synchronous I/O
AGTL+ Strobes
CMOS Input
Open Drain Output
CMOS Output
CMOS Input
Open Drain Output
FSB Clock
Power/Other
Notes:
1. Refer to
2. BPM[2:1]# and PRDY# are AGTL+ output only signals.
January 2007
Order Number: 315876-002
® ®
Celeron Processor 1.66 GHz/1.83 GHz
Table 5 identifies which signals are common clock, source synchronous,
Type
Synchronous
to BCLK[1:0]
Synchronous
to BCLK[1:0]
Synchronous
to assoc.
strobe
Synchronous
to BCLK[1:0]
Asynchronous
Asynchronous
Asynchronous
Synchronous
to TCK
Synchronous
to TCK
Clock
Chapter 4.0 for signal descriptions and termination requirements.
Signals
BPRI#, DEFER#, PREQ#, RESET#, RS[2:0]#, RSP#,
TRDY#
ADS#, AP[1:0]#,BINIT#, BNR#, BPM[3:0]#
DBSY#, DP[3:0], DRDY#, HIT#, HITM#, LOCK#,
3
MCERR#, PRDY#
Signals
REQ[4:0]#, A[16:3]# ADSTB[0]#
A[35:17]# ADSTB[1]#
D[15:0]#, DINV0# DSTBP0#, DSTBN0#
D[31:16]#, DINV1# DSTBP1#, DSTBN1#
D[47:32]#, DINV2# DSTBP2#, DSTBN2#
D[63:48]#, DINV3# DSTBP3#, DSTBN3#
ADSTB[1:0]#, DSTBP[3:0]#, DSTBN[3:0]#
A20M#, FORCEPR#, IGNNE#, INIT#, LINT0/INTR, LINT1/
NMI, PWRGOOD, SMI#, SLP#, STPCLK#
FERR#, IERR#, THERMTRIP#, PROCHOT#
VID[5:0], BSEL[2:0]
TCK, TDI, TMS, TRST#
TDO
BCLK[1:0]
2
COMP[3:0], DBR# , GTLREF, RSVD, TEST2, TEST1,
THERMDA, THERMDC, ODTEN, V
V V
SS, SS_SENSE
® ®
Intel Celeron Processor 1.66 GHz/1.83 GHz
1
3
, BR[0]#,
Associated Strobe
, V , V V ,
CCP, CC_SENSE
CC CCA
DS
19