Design Guide
213
Layout Checklist
14.2
Intel
®
E7500 MCH Layout Checklist
Table 14-2. MCH Layout Checklist (Sheet 1 of 3)
Checklist Items
Recommendations
Comments
Host Interface
ADS#
AP[1:0]
BINIT#
BNR#
BPRI#
BREQ0#
1
CPURST#
2
DBSY#
DEFER#
HA[35:3]#
3
HD[63:0]#
4
HADSTB[1:0]#
5
HDSTBN[3:0]#
6
HDSTBP[3:0]#
7
HIT#
HITM#
HLOCK#
HREQ[4:0]#
8
HTRDY#
9
DP[3:0]#
DRDY#
RS[2:0]#
RSP#
XERR#
10
DBI[3:0]#
•
See processor section of this checklist.
DDR Interfaces A & B / Connector
General
Guidelines
•
Route interface 50
Ω
nominal impedance,
± 10%.
•
5 on 15 is maintained for Data/Strobe/
CMD signals;
5 on 7 is maintained for CK/
CK# signals.
•
If using the recommended stackup, outer
layer routing of DDR signals should be
kept to a minimum (except for reference
voltages). Via up close to passive
devices, and immediately via back down
following the device.
•
Try to maintain same ground reference
when transitioning layers—add stitching
via if reference plane changes.
•
Connect termination resistors directly to
termination plane (flood is on outer layer).
•
Space traces out as much as possible
through the DIMMs.
•
All traces are routed 1.8" to 6.0" from
MCH to first DIMM connector, and 0.8" to
1.2” between connectors.
Содержание Xeon
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