Intel 820E Benutzerhandbuch

Design Guide 

 

35 

The RSL signals enter the first RIMM on the left side, propagate through the RIMM, and exit on the 
right. The signal continues through the rest of the existing RIMMs until it is terminated at V

TERM

. All 

unpopulated slots must have continuity modules in place to ensure that the signals propagate to the 
termination.  

rsl_route

MCH

MCH to first

RIMM

RIMM_0

RIMM_1

A

B

C

RIMM to

RIMM

RIMM to

Termination

0"-3.50"

0.4"-0.45"

0"-3"

 

To maintain a nominal 28 

Ω

 trace impedance, the RSL signals must be 18 mils wide. To control crosstalk 

and odd/even-mode velocity deltas, there must be a 10 mil ground isolation trace routed between 
adjacent RSL signals. The 10 mil ground isolation traces must be connected to ground with a via every 1 
inch. A 6 mil gap is required between the RSL signals and the ground isolation trace. These signals must 
be length-matched to ±10 mils in line section A and to ±2 mils in line section B, using the trace length 
matching methods in Section 2.7.2.6. To ensure uniform trace lines, trace width variation must be 
uniform on all RSL signals at every neckdown for each line section. All RSL signals must have the same 
number of vias. It may be necessary to place vias on RSL signals where they are not necessary to meet 
this via loading requirement (i.e., dummy vias). 

A 

MCH to first RIMM connector 

0 to 3.50 

B 

RIMM to RIMM 

0.4 to 0.45 

C 

RIMM to termination 

0 to 3