Memory Stackup Guidelines - Intel Quark SoC X1000 Design Manual

Table 11. Clock Routing Guidelines and settings for a Single Rank 4L Fly-by Design—PCB
Type 3
Parameter
Transmission Line
Segment
Stackup Layer (Microstrip
/ Stripline/ Dual
Stripline)
Characteristic Impedance
(CLK Group)
Trace Width
Trace Spacing (S):
Between P and N of a CLK
pair
Trace Spacing (S1):
Between point-to-point
CLK pair to another CLK
pair
Trace Spacing (S2):
Between point-to-point
CLK Group and other DDR
groups
Trace Spacing (S3):
Between point-to-point
CLK Group non-DDR
signals
Point-to-point CLOCK
group Trace Segment
Length
Point-to-point CLOCK
group Total trace length
Length matching
between CK and CKB of
CLOCK (including pkg.
length)
Number of vias
RTT Value
Cap Value
Ctt Value
SoC BUffer Settings:
Note: All length matching and total trace length rules are applicable for the SoC to DRAM
paths; for Termination Segment (TL7) only the min and max trace segment length rules
apply.
3.3.2

Memory Stackup Guidelines

Refer see
®
Intel Quark™ SoC X1000
PDG
36
TL1 TL2 TL3
MS MS MS
66 Ω DIFF 10% (MS)
4.0 mils 7.2 mils 4.0 mils
4.0 mils 5.3 mils 4.0 mils
min = min = 25 min = 4
12.0 mils mils mils
min = 4 min = 25 min = 4.0
mils mils mils
min = 4 min = 25 min =
mils mils 12.0 mils
min =
500 mils
max = max =
200 mils 100 mils
max =
2500 mils
1st DRAM: TL1 + TL2 + TL3 + TL8 = 3000 mils (max)
2nd DRAM: TL1 + TL2 + TL3 + TL4 + TL5 + TL6 + TL8 = 3800 mils (max)
± 5 mils
max = 3 via
30 Ω + 10%
1 pF
0.1 F
RON: 26 Ω.
SR: 4V/ns
Chapter 2.0 for motherboard stack up details.
®
Intel Quark™ SoC X1000—DDR3 Memory Design Guidelines
Routing Guideline / Setting
TL4 TL5
MS MS
4.0 mils 7.2 mils
4.0 mils 5.3 mils
min = 4.0 min = 25
mils mils
min = 4.0 min = 10
mils mils
min = 12 min = 25
mils mils
min =
400 mils
max =
100 mils
max =
600 mils
TL6 TL7 TL8
MS MS MS
4.0 mils 7.2 mils 4.0 mils
4.0 mils 5.3 mils 4.0 mils
min = 4.0 min = 25 min = 4.0
mils mils mils
min = 4.0 min = 25 min = 4.0
mils mils mils
min = 12 min = 25 min = 4.0
mils mils mils
max = max = max =
100 mils 450 mils 200 mils
June 2014
Order Number: 330258-002US