Intel Xeon User Manual

Layout Checklist
212 Design Guide
COMP[1:0]
ODTEN
SKTOCC#
TESTHI[6:0]
VID[4:0]
• There are no routing requirements for these
signals.
• Enables processor on-die
termination.
• Input.
• Refer to Section 5.3.
Reserved • Reserved signals must remain as a No
Connect (NC).
SM_ALERT#
SM_CLK
SM_DAT
SM_EP_A[2:0]
SM_TS_A[1:0]
SM_WP
• Should be connected to the SMBus
controller on 3.3 V partition.
•SMBus I/O.
• Refer to Section 5.3.4.
VCCA • To satisfy damping requirements, total series
resistance in the filter (from VCC_CPU to the
top plate of the capacitor) must be at least
0.35
Ω. It includes the minimum DCR of the
inductor, and any resistance (routing or
discrete components) between VCC_CPU
and capacitor top plate.
• The total maximum resistance cannot be
greater than 1.1
Ω as measured from VCC
(more specifically, the baseboard via that
connects the PLL filter to the VCC plane) to
the processor VCCA interposer pin. Also,
maximum trace resistance from the filter
capacitor to processor socket pin should be
less than 0.02
Ω.
• An isolated power for internal
PLL.
• Refer to Section 12.2.8.
VSSA
VCCIOPLL
• There are no routing requirements for these
signals.
• Refer to Section 12.2.8.
VCCSENSE
VSSSENSE
• Route traces using 5/15 mil spacing.
• Place via next to the processor socket’s pin
for measurement of VCC_CPU/VSS.
• Refer to Section 12.2.3.
NOTES:
1. A[35:3]# pins on the processor correspond to HA[35:3]# pins on the MCH.
2. ADSTB[1:0]# pins on the processor correspond to HADSTB[1:0]# pins on the MCH.
3. DSTBN[3:0]# pins on the processor correspond to HADSTBN[3:0]# pins on the MCH.
4. DSTBP[3:0]# pins on the processor correspond to HADSTBP[3:0]# pins on the MCH.
5. D[63:0]# pins on the processor correspond to HD[63:0]# pins on the MCH.
6. REQ[4:0]# pins on the processor correspond to HREQ[4:0]# pins on the MCH.
7. The RESET# pin on the processor corresponds to the CPURST# pin on the MCH.
8. The TRDY# pin on the processor corresponds to the HTRDY# pin on the MCH.
Table 14-1. Processor Layout Checklist (Sheet 2 of 2)
Checklist Items Recommendations Comments

Intel Xeon Specifications

General

Brand	Intel
Model	Xeon
Category	Processor
Language	English