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SPI
Intel® Quark™ SE Microcontroller C1000
Platform Design Guide
June 2017
36
Document Number: 334715-004EN
Table 16. SPI Dual Flash Platform Routing Guidelines
SPI Dual Flash
MOSI/MISO/SPI_IO/CLK
SoC
Breakout
Main Routing
T Branch
Routing
Device
Breakout
Transmission Line
Segment
TL0
TL1
TL2
TL3
Routing Layer
(Microstrip/Stripline/Dual
Stripline)
MS/SL
MS/SL
MS/SL
MS/SL
Characteristic Impedance
50Ω +/- 10%
50Ω +/- 10%
50Ω +/- 10%
50Ω +/- 10%
Trace Width (w)
3.5 mils
minimum
Meet
impedance
Meet
impedance
Meet
impedance
Trace Spacing (S1):
Between SPI signals
4 mils
3W
3W
2W
Trace Spacing (S2):
Between SPI signals and
other signals
5 mils
3W
3W
2W
Trace Spacing(S3):
Between SPI_CLK to other
signals
5 mils
3W
3W
2W
Trace Length
<100 mils
1500 mils <
TL0+TL1+TL2+
TL3 < 8000
mils
TL2+TL3
< 2000 mils
<500 mils
Length mismatch between
SPI_CLK and DATA
(SPI_IO/MOSI/MISO)
<250 mils
Length mismatch between
branches of same net
<100 mils
Trace Total Length
1500 mils < Total Length of Single Flash Device < 8000 mils
Number of vias allowed
4
Via stub length
< 80 mils
Rs
33Ω
Reference
VSS referencing
W
W is the trace width
Figure 17. SPI_CS Point-to-Point Dual Flash Topology
TL0
TL1
TL2
FLASH
Device
Dual Load SPI_CS
ATP SOC
Rs