Memory Interface Routing Guidelines
78 Design Guide
6.7 Enable Signal (RCVEN#)
The MCH uses the “receive enable” (RCVEN#) signal to determine the approximate DIMM
round-trip flight time (command flight + data flight). Two pins exist on the MCH to facilitate the
use of RCVEN#: RCVENOUT# and RCVENIN#. RCVENOUT# is an output of the MCH, and
RCVENIN# is an input to the MCH. The board designer must connect RCVENOUT# to
RCVENIN#. The length of the RCVEN# signal trace must be 15" ± 100 mils. Figure 6-13
illustrates the routing recommendations of the RCVEN# signal.
Figure 6-13. Receive Enable Signal Routing Guidelines
MCH
DDR VTERM
(1.25V)
47
Ω ± 2%
RCVENIN#
RCVENOUT#
RCVEN# Total Length:
15 inches ± 100 mils
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