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STPCI2GDY Datasheet(PDF) 94 Page - STMicroelectronics

Part No. STPCI2GDY
Description  X86 Core PC Compatible System-on-Chip for Terminals
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STPCI2GDY Datasheet(HTML) 94 Page - STMicroelectronics

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DESIGN GUIDELINES
94/111
Issue 1.0 - July 24, 2002
memory clock input (MCLKI) and any other
component
using
the
memory
clock
are
individually driven from a low skew clock driver
with matched routing lengths. In other words, all
clock line lengths that go from the buffer to the
memory chips (MCLKx) and from the buffer to the
STPC (MCLKI) must be identical.
This is shown in Figure 6-23.
Figure 6-22. DIMM placement
DIMM2
DIMM1
STPC
35mm
35mm
15mm
10mm
116mm
SDRAM I/F
Figure 6-23. Clock Routing
MCLKO
DIMM CKn input
STPC MCLKI
DIMM CKn input
DIMM CKn input
Low skew clock driver:
L
L+75mm*
20pF
* No additional 75mm when SDRAM directly soldered on board


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