JEDEC Standard No. 305-R8-RCE
Version 1.0
-ii-
Contents (cont'd)
Table 9 — R/C E0 – Trace Lengths for DQ[31:00]_A, CB[07:00]_A, DQS[04:00]_t_A, and
DQS[04:00]_c_A ............................................................................................................................. 10
Table 10 — R/C E0 – Trace Lengths for DQ[31:00]_B, CB[07:00]_B, DQS[04:00]_t_B, and
DQS[04:00]_c_B ........................................................................................................................... 11
Table 11 — Trace Lengths for Post Register Address and Command Net Structures ....................................... 12
Table 12 — Trace Lengths for Post Register Control Net Structures ................................................................ 13
Table 13 — Trace Lengths for Pre-Register Address, Command, and Parity Net Structures ............................ 14
Table 14 — Voltage Operating Conditions ........................................................................................................ 15
Table 15 — Trace Lengths for RESET_n and QRST_n_[B:A] Net Structures ................................................. 16
Table 16 — Trace Lengths for ALERT_n Output Net Structures ...................................................................... 17
Table 17 — Trace Lengths for DERROR_in_n_[B:A] Net Structures .............................................................. 17
Table 18 — RC E0 – SPD Programming ........................................................................................................... 18
Table 19 — PCB Fabrication ............................................................................................................................. 19
Figures
Figure 1 — General Layout ................................................................................................................................. 3
Figure 2 — X80 DIMM, Populated as Two Package Ranks of x8 DDR5 SDRAMs (Part 1 of 4) ...................... 4
Figure 3 — X80 DIMM, Populated as Two Package Ranks of x8 DDR5 SDRAMs (Part 2 of 4) ...................... 5
Figure 4 — X80 DIMM, Populated as Two Package Ranks of x8 DDR5 SDRAMs (Part 3 of 4) ...................... 6
Figure 5 — X80 DIMM, Populated as Two Package Ranks of x8 DDR5 SDRAMs (Part 4 of 4) ...................... 7
Figure 6 — Net Structure Routing for Register Clock Input ............................................................................... 8
Figure 7 — Net Structure Routing for Register Clock Output to SDRAM Load QACK_C_[B:A],
QACK_T_[B:A], QCCK_C_[B:A], and QCCK_T_[B:A] .............................................................. 9
Figure 8 — Net Structure Routing for DQ, CB, DQS_t, and DQS_c ................................................................ 10
Figure 9 — Net Structure Routing for QACA[13:00]_[B:A] ............................................................................ 12
Figure 10 — Net Structure Routing for QACS[01:00]_[B:A] ........................................................................... 13
Figure 11 — Net Structure Routing for CA[06:00]_[B:A], CS[01:00]_n_[B:A], and PAR_[B:A] ...................
14
F
igure 12 — DIMM Impedance Profile ............................................................................................................ 15
Figure 13 — Net Structure Routing for RESET_n and QRST_n_[B:A] ........................................................... 16
Figure 14 — Net Structure Routing for ALERT_n ............................................................................................ 16
Figure 15 — Net Structure Routing for DERROR_in_n_[B:A] ........................................................................ 17
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JEDEC