JEDEC Standard No. 309-S4-RCD
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DDR5 SODIMM Raw Card Annex D
Contents
Page
1 Scope ................................................................................................................................................. 1
2 DDR5 Small Outline DIMM Design File ......................................................................................... 1
3 Module Configuration ....................................................................................................................... 1
4 SDRAM Configuration ..................................................................................................................... 2
5 Supported Speeds .............................................................................................................................. 2
6 Design Deviations ............................................................................................................................. 2
7 General Layout .................................................................................................................................. 3
8 Functional Block Diagram ................................................................................................................ 4
9 Sideband Bus Routing ....................................................................................................................... 7
10 Clock Net Structure ........................................................................................................................... 7
11 Data Net Structure – DQ, CB, DQS_t, DQS_c, DM ........................................................................ 8
12 Address and Command Net Structure Routing ............................................................................... 10
13 Control Net Structure Routing ........................................................................................................ 11
14 DIMM Impedance Profile ............................................................................................................... 12
15 ALERT_n Net Structure Routing .................................................................................................... 13
16 RESET_n Net Structure Routing .................................................................................................... 14
17 Cross Section Recommendations .................................................................................................... 15
Tables
Table 1 — DDR5 SODIMM Design File ..................................................................................................... 1
Table 2 — Module Configuration ................................................................................................................. 1
Table 3 — SDRAM Configuration ............................................................................................................... 2
Table 4 — Supported Speeds ........................................................................................................................ 2
Table 5 — Design Deviations ....................................................................................................................... 2
Table 6 — Trace Lengths for Host and Local Signals .................................................................................. 7
Table 7 — Trace Lengths for Clock to SDRAM Load Net Structures ......................................................... 8
Table 8 — Trace Lengths for DQ[31:00]_A, CB[03:00]_A, DQS[04:00]_t_A, DQS[04:00]_c_A,
DM[03:00]_N_A, DQ[31:00]_B, CB[03:00]_B, DQS[04:00]_t_B, DQS[04:00]_c_B,
DM[03:00]_N_B ......................................................................................................................... 9
Table 9 — Trace Lengths for Address and Command Net Structures ........................................................ 10
Table 10 — Trace Lengths for Control Net Structures ............................................................................... 11