Terminal Resistance/Damping Resistance/Wire Length - Fujitsu MB86R12 Design Manualline

MB86R12 Application Note
DDR3 Interface PCB Design Guideline
4.4.

Terminal resistance/Damping resistance/Wire length

Table 4-2 shows the recommended resistance value and wire length for each group.
The wiring topology diagram relevant to this section is shown in "4.7. Wiring topology".
Table 4-2 Resistance value and wire length list
No. Group name
MCK_Group
1
MDQSx_Group
2
MDQx_Group
3
MCNTL_Group
4
MCMD_Group
5
FUJITSU SEMICONDUCTOR CONFIDENTIAL
External terminal Damping
resistance value resistance value
(Rt)
39Ω × 2
0.1μF capacitor × 1
Refer to "4.7.1
( .")
N/A
N/A
39Ω
39Ω
Wire length from
MB86R12 output to
(Rd) SDRAM input
N/A Refer to "4.7.1
N/A Refer to "
4.7.2."
N/A Refer to "
4.7.3."
N/A Refer to "
4.7.4."
N/A Refer to "
4.7.4."
6
Internal group approved
wire length variation
Meet the conditions of
."
"4.7.1
."
Meet the conditions of
"
4.7.2."
Meet the conditions of
"
4.7.3."
Meet the conditions of
"
4.7.4."
Meet the conditions of
"
4.7.4."