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Low Voltage Intel
®
Xeon
Processor at 1.60 GHz, 2.0 GHz and 2.4 GHz
20 Datasheet
rising edge of BCLK0. Asynchronous signals are still present (A20M#, IGNNE#, etc.) and may
become active at any time during the clock cycle. Table 5 identifies which signals are common
clock, source synchronous and asynchronous.
Table 5. System Bus Signal Groups
Signal Group Type Signals
1
AGTL+ Common Clock Input Synchronous to BCLK[1:0]
BPRI#, BR[3:1]#
3, 4
, DEFER#, RESET#
4
,
RS[2:0]#, RSP#, TRDY#
AGTL+ Common Clock I/O Synchronous to BCLK[1:0]
ADS#, AP[1:0]#, BINIT#
7
, BNR#
7
, BPM[5:0]#
2
,
BR0#
2
, DBSY#, DP[3:0]#, DRDY#, HIT#
7
,
HITM#
7
, LOCK#, MCERR#
7
AGTL+ Source Synchronous
I/O
Synchronous to assoc.
strobe
AGTL+ Strobes Synchronous to BCLK[1:0] ADSTB[1:0]#, DSTBP[3:0]#, DSTBN[3:0]#
Asynchronous GTL+ Input
4
Asynchronous
A20M#
5
, IGNNE#
5
, INIT#
6
, LINT0/INTR
5
,
LINT1/NMI
5
, SMI#
6
, SLP#, STPCLK#
Asynchronous GTL+ Output
4
Asynchronous FERR#, IERR#, THERMTRIP#
Asynchronous GTL+ Input/
Output
9
Asynchronous PROCHOT#
System Bus Clock Clock BCLK1, BCLK0
TAP Input
2
Synchronous to TCK TCK, TDI, TMS, TRST#
TAP Output
2
Synchronous to TCK TDO
Power/Other Power/Other
BSEL[1:0], COMP[1:0], GTLREF, ODTEN,
Reserved, SKTOCC#, TESTHI[6:0],VID[4:0],
V
CC
, V
CCA
, V
CCIOPLL
, V
SSA
, V
SS
, V
CCSENSE
,
V
SSSENSE,
PWRGOOD, THERMDA,
THERMDC. VID_V
CC
8
NOTES:
1. Refer to Section 5.2 for signal descriptions.
2. These AGTL+ signal groups are not terminated by the processor. Refer the ITP700 Debug Port Design
Guide and corresponding Design Guide for termination requirements and further details.
3. The Low Voltage Intel
®
Xeon™ processor utilizes only BR0# and BR1#. BR2# and BR3# are not driven by
the processor but must be terminated to V
CC
. For additional details regarding the BR[3:0]# signals, see
Section 5.2 and Section 7.1 and the appropriate Platform Design Guidelines.
4. These signal groups are not terminated by the processor. Refer to the appropriate platform design
guidelines and the ITP700 Debug Port Design Guide for termination recommendations.
5. The volume on these pins during active-to-inactive edge of RESET# determines the multiplier that the
Phase Lock Loop (PLL) will use for internal core clock
6. The value of these pins during the active-to-inactive edge of RESET# to determine processor configuration
options. See Section 7.1 for details.
7. These signals may be driven simultaneously by multiple agents (wired-OR).
8. VID_V
CC
is required for correct operation of the Low Voltage Intel
®
Xeon™ Processor. Refer to Figure 16
for details.
9. It is an output only on the 1.60 GHz Low Voltage Intel
®
Xeon™ processor with CPUID of 0F27h.
Signals Associated Strobe
REQ[4:0]#,A[16:3]#
6
ADSTB0#
A[35:17]#
5
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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